| 1 | /* $Id: SELM.cpp 45555 2013-04-15 15:17:04Z vboxsync $ */
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| 2 | /** @file
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| 3 | * SELM - The Selector Manager.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2013 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 | /** @page pg_selm SELM - The Selector Manager
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| 19 | *
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| 20 | * SELM takes care of GDT, LDT and TSS shadowing in raw-mode, and the injection
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| 21 | * of a few hyper selector for the raw-mode context. In the hardware assisted
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| 22 | * virtualization mode its only task is to decode entries in the guest GDT or
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| 23 | * LDT once in a while.
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| 24 | *
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| 25 | * @see grp_selm
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| 26 | *
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| 27 | *
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| 28 | * @section seg_selm_shadowing Shadowing
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| 29 | *
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| 30 | * SELMR3UpdateFromCPUM() and SELMR3SyncTSS() does the bulk synchronization
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| 31 | * work. The three structures (GDT, LDT, TSS) are all shadowed wholesale atm.
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| 32 | * The idea is to do it in a more on-demand fashion when we get time. There
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| 33 | * also a whole bunch of issues with the current synchronization of all three
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| 34 | * tables, see notes and todos in the code.
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| 35 | *
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| 36 | * When the guest makes changes to the GDT we will try update the shadow copy
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| 37 | * without involving SELMR3UpdateFromCPUM(), see selmGCSyncGDTEntry().
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| 38 | *
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| 39 | * When the guest make LDT changes we'll trigger a full resync of the LDT
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| 40 | * (SELMR3UpdateFromCPUM()), which, needless to say, isn't optimal.
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| 41 | *
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| 42 | * The TSS shadowing is limited to the fields we need to care about, namely SS0
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| 43 | * and ESP0. The Patch Manager makes use of these. We monitor updates to the
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| 44 | * guest TSS and will try keep our SS0 and ESP0 copies up to date this way
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| 45 | * rather than go the SELMR3SyncTSS() route.
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| 46 | *
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| 47 | * When in raw-mode SELM also injects a few extra GDT selectors which are used
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| 48 | * by the raw-mode (hyper) context. These start their life at the high end of
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| 49 | * the table and will be relocated when the guest tries to make use of them...
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| 50 | * Well, that was that idea at least, only the code isn't quite there yet which
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| 51 | * is why we have trouble with guests which actually have a full sized GDT.
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| 52 | *
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| 53 | * So, the summary of the current GDT, LDT and TSS shadowing is that there is a
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| 54 | * lot of relatively simple and enjoyable work to be done, see @bugref{3267}.
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| 55 | *
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| 56 | */
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| 57 |
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| 58 | /*******************************************************************************
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| 59 | * Header Files *
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| 60 | *******************************************************************************/
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| 61 | #define LOG_GROUP LOG_GROUP_SELM
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| 62 | #include <VBox/vmm/selm.h>
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| 63 | #include <VBox/vmm/cpum.h>
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| 64 | #include <VBox/vmm/stam.h>
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| 65 | #include <VBox/vmm/em.h>
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| 66 | #include <VBox/vmm/mm.h>
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| 67 | #include <VBox/vmm/ssm.h>
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| 68 | #include <VBox/vmm/pgm.h>
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| 69 | #include <VBox/vmm/trpm.h>
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| 70 | #include <VBox/vmm/dbgf.h>
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| 71 | #include "SELMInternal.h"
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| 72 | #include <VBox/vmm/vm.h>
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| 73 | #include <VBox/err.h>
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| 74 | #include <VBox/param.h>
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| 75 |
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| 76 | #include <iprt/assert.h>
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| 77 | #include <VBox/log.h>
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| 78 | #include <iprt/asm.h>
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| 79 | #include <iprt/string.h>
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| 80 | #include <iprt/thread.h>
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| 81 | #include <iprt/string.h>
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| 82 |
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| 83 | #include "SELMInline.h"
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| 84 |
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| 85 |
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| 86 | /** SELM saved state version. */
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| 87 | #define SELM_SAVED_STATE_VERSION 5
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| 88 |
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| 89 |
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| 90 | /*******************************************************************************
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| 91 | * Internal Functions *
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| 92 | *******************************************************************************/
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| 93 | static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM);
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| 94 | static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass);
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| 95 | static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM);
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| 96 | static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
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| 97 | static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
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| 98 | static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPhys, void *pvBuf, size_t cbBuf, PGMACCESSTYPE enmAccessType, void *pvUser);
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| 99 | static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 100 | static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 101 | static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 102 | static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 103 | //static DECLCALLBACK(void) selmR3InfoTss(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 104 | //static DECLCALLBACK(void) selmR3InfoTssGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs);
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| 105 |
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| 106 |
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| 107 | /*******************************************************************************
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| 108 | * Global Variables *
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| 109 | *******************************************************************************/
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| 110 | #ifdef LOG_ENABLED
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| 111 | /** Segment register names. */
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| 112 | static char const g_aszSRegNms[X86_SREG_COUNT][4] = { "ES", "CS", "SS", "DS", "FS", "GS" };
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| 113 | #endif
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| 114 |
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| 115 |
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| 116 | /**
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| 117 | * Initializes the SELM.
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| 118 | *
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| 119 | * @returns VBox status code.
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| 120 | * @param pVM Pointer to the VM.
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| 121 | */
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| 122 | VMMR3DECL(int) SELMR3Init(PVM pVM)
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| 123 | {
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| 124 | LogFlow(("SELMR3Init\n"));
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| 125 |
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| 126 | /*
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| 127 | * Assert alignment and sizes.
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| 128 | * (The TSS block requires contiguous back.)
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| 129 | */
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| 130 | AssertCompile(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding)); AssertRelease(sizeof(pVM->selm.s) <= sizeof(pVM->selm.padding));
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| 131 | AssertCompileMemberAlignment(VM, selm.s, 32); AssertRelease(!(RT_OFFSETOF(VM, selm.s) & 31));
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| 132 | #if 0 /* doesn't work */
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| 133 | AssertCompile((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
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| 134 | AssertCompile((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
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| 135 | #endif
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| 136 | AssertRelease((RT_OFFSETOF(VM, selm.s.Tss) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.Tss));
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| 137 | AssertRelease((RT_OFFSETOF(VM, selm.s.TssTrap08) & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(pVM->selm.s.TssTrap08));
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| 138 | AssertRelease(sizeof(pVM->selm.s.Tss.IntRedirBitmap) == 0x20);
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| 139 |
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| 140 | /*
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| 141 | * Init the structure.
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| 142 | */
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| 143 | pVM->selm.s.offVM = RT_OFFSETOF(VM, selm);
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| 144 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = (SELM_GDT_ELEMENTS - 0x1) << 3;
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| 145 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = (SELM_GDT_ELEMENTS - 0x2) << 3;
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| 146 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = (SELM_GDT_ELEMENTS - 0x3) << 3;
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| 147 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = (SELM_GDT_ELEMENTS - 0x4) << 3;
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| 148 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = (SELM_GDT_ELEMENTS - 0x5) << 3;
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| 149 |
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| 150 | /*
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| 151 | * Allocate GDT table.
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| 152 | */
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| 153 | int rc = MMR3HyperAllocOnceNoRel(pVM, sizeof(pVM->selm.s.paGdtR3[0]) * SELM_GDT_ELEMENTS,
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| 154 | PAGE_SIZE, MM_TAG_SELM, (void **)&pVM->selm.s.paGdtR3);
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| 155 | AssertRCReturn(rc, rc);
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| 156 |
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| 157 | /*
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| 158 | * Allocate LDT area.
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| 159 | */
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| 160 | rc = MMR3HyperAllocOnceNoRel(pVM, _64K + PAGE_SIZE, PAGE_SIZE, MM_TAG_SELM, &pVM->selm.s.pvLdtR3);
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| 161 | AssertRCReturn(rc, rc);
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| 162 |
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| 163 | /*
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| 164 | * Init Guest's and Shadow GDT, LDT, TSS changes control variables.
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| 165 | */
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| 166 | pVM->selm.s.cbEffGuestGdtLimit = 0;
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| 167 | pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
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| 168 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
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| 169 | pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
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| 170 |
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| 171 | pVM->selm.s.paGdtRC = NIL_RTRCPTR; /* Must be set in SELMR3Relocate because of monitoring. */
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| 172 | pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
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| 173 | pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
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| 174 | pVM->selm.s.GCSelTss = RTSEL_MAX;
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| 175 |
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| 176 | pVM->selm.s.fDisableMonitoring = false;
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| 177 | pVM->selm.s.fSyncTSSRing0Stack = false;
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| 178 |
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| 179 | /* The I/O bitmap starts right after the virtual interrupt redirection bitmap. Outside the TSS on purpose; the CPU will not check it
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| 180 | * for I/O operations. */
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| 181 | pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
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| 182 | /* bit set to 1 means no redirection */
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| 183 | memset(pVM->selm.s.Tss.IntRedirBitmap, 0xff, sizeof(pVM->selm.s.Tss.IntRedirBitmap));
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| 184 |
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| 185 | /*
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| 186 | * Register the saved state data unit.
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| 187 | */
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| 188 | rc = SSMR3RegisterInternal(pVM, "selm", 1, SELM_SAVED_STATE_VERSION, sizeof(SELM),
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| 189 | NULL, NULL, NULL,
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| 190 | NULL, selmR3Save, NULL,
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| 191 | NULL, selmR3Load, selmR3LoadDone);
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| 192 | if (RT_FAILURE(rc))
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| 193 | return rc;
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| 194 |
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| 195 | /*
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| 196 | * Statistics.
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| 197 | */
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| 198 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestGDTHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest GDT.");
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| 199 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestGDTUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/GDTEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest GDT.");
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| 200 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestLDT, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/LDT", STAMUNIT_OCCURENCES, "The number of writes to the Guest LDT was detected.");
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| 201 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSHandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSInt", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS.");
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| 202 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSRedir, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSRedir",STAMUNIT_OCCURENCES, "The number of handled redir bitmap writes to the Guest TSS.");
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| 203 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSHandledChanged,STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSIntChg", STAMUNIT_OCCURENCES, "The number of handled writes to the Guest TSS where the R0 stack changed.");
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| 204 | STAM_REG(pVM, &pVM->selm.s.StatRCWriteGuestTSSUnhandled, STAMTYPE_COUNTER, "/SELM/GC/Write/Guest/TSSEmu", STAMUNIT_OCCURENCES, "The number of unhandled writes to the Guest TSS.");
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| 205 | STAM_REG(pVM, &pVM->selm.s.StatTSSSync, STAMTYPE_PROFILE, "/PROF/SELM/TSSSync", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3SyncTSS() body.");
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| 206 | STAM_REG(pVM, &pVM->selm.s.StatUpdateFromCPUM, STAMTYPE_PROFILE, "/PROF/SELM/UpdateFromCPUM", STAMUNIT_TICKS_PER_CALL, "Profiling of the SELMR3UpdateFromCPUM() body.");
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| 207 |
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| 208 | STAM_REL_REG(pVM, &pVM->selm.s.StatHyperSelsChanged, STAMTYPE_COUNTER, "/SELM/HyperSels/Changed", STAMUNIT_OCCURENCES, "The number of times we had to relocate our hypervisor selectors.");
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| 209 | STAM_REL_REG(pVM, &pVM->selm.s.StatScanForHyperSels, STAMTYPE_COUNTER, "/SELM/HyperSels/Scan", STAMUNIT_OCCURENCES, "The number of times we had find free hypervisor selectors.");
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| 210 |
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| 211 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleES", STAMUNIT_OCCURENCES, "Stale ES was detected in UpdateFromCPUM.");
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| 212 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleCS", STAMUNIT_OCCURENCES, "Stale CS was detected in UpdateFromCPUM.");
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| 213 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleSS", STAMUNIT_OCCURENCES, "Stale SS was detected in UpdateFromCPUM.");
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| 214 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleDS", STAMUNIT_OCCURENCES, "Stale DS was detected in UpdateFromCPUM.");
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| 215 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleFS", STAMUNIT_OCCURENCES, "Stale FS was detected in UpdateFromCPUM.");
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| 216 | STAM_REL_REG(pVM, &pVM->selm.s.aStatDetectedStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/DetectedStaleGS", STAMUNIT_OCCURENCES, "Stale GS was detected in UpdateFromCPUM.");
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| 217 |
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| 218 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleES", STAMUNIT_OCCURENCES, "Already stale ES in UpdateFromCPUM.");
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| 219 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleCS", STAMUNIT_OCCURENCES, "Already stale CS in UpdateFromCPUM.");
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| 220 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleSS", STAMUNIT_OCCURENCES, "Already stale SS in UpdateFromCPUM.");
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| 221 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleDS", STAMUNIT_OCCURENCES, "Already stale DS in UpdateFromCPUM.");
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| 222 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleFS", STAMUNIT_OCCURENCES, "Already stale FS in UpdateFromCPUM.");
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| 223 | STAM_REL_REG(pVM, &pVM->selm.s.aStatAlreadyStaleSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/AlreadyStaleGS", STAMUNIT_OCCURENCES, "Already stale GS in UpdateFromCPUM.");
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| 224 |
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| 225 | STAM_REL_REG(pVM, &pVM->selm.s.StatStaleToUnstaleSReg, STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/StaleToUnstale", STAMUNIT_OCCURENCES, "Transitions from stale to unstale UpdateFromCPUM.");
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| 226 |
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| 227 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_ES], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedES", STAMUNIT_OCCURENCES, "Updated hidden ES values in UpdateFromCPUM.");
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| 228 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_CS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedCS", STAMUNIT_OCCURENCES, "Updated hidden CS values in UpdateFromCPUM.");
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| 229 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_SS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedSS", STAMUNIT_OCCURENCES, "Updated hidden SS values in UpdateFromCPUM.");
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| 230 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_DS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedDS", STAMUNIT_OCCURENCES, "Updated hidden DS values in UpdateFromCPUM.");
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| 231 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_FS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedFS", STAMUNIT_OCCURENCES, "Updated hidden FS values in UpdateFromCPUM.");
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| 232 | STAM_REG( pVM, &pVM->selm.s.aStatUpdatedSReg[X86_SREG_GS], STAMTYPE_COUNTER, "/SELM/UpdateFromCPUM/UpdatedGS", STAMUNIT_OCCURENCES, "Updated hidden GS values in UpdateFromCPUM.");
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| 233 |
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| 234 | STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelGst, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from guest tables.");
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| 235 | STAM_REG( pVM, &pVM->selm.s.StatLoadHidSelShw, STAMTYPE_COUNTER, "/SELM/LoadHidSel/LoadedShadow", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Loaded from shadow tables.");
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| 236 | STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelReadErrors, STAMTYPE_COUNTER, "/SELM/LoadHidSel/GstReadErrors", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: Guest table read errors.");
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| 237 | STAM_REL_REG(pVM, &pVM->selm.s.StatLoadHidSelGstNoGood, STAMTYPE_COUNTER, "/SELM/LoadHidSel/NoGoodGuest", STAMUNIT_OCCURENCES, "SELMLoadHiddenSelectorReg: No good guest table entry.");
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| 238 |
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| 239 | #ifdef VBOX_WITH_RAW_MODE
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| 240 | /*
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| 241 | * Default action when entering raw mode for the first time
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| 242 | */
|
|---|
| 243 | PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
|
|---|
| 244 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 245 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 246 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 247 | #endif
|
|---|
| 248 |
|
|---|
| 249 | /*
|
|---|
| 250 | * Register info handlers.
|
|---|
| 251 | */
|
|---|
| 252 | DBGFR3InfoRegisterInternal(pVM, "gdt", "Displays the shadow GDT. No arguments.", &selmR3InfoGdt);
|
|---|
| 253 | DBGFR3InfoRegisterInternal(pVM, "gdtguest", "Displays the guest GDT. No arguments.", &selmR3InfoGdtGuest);
|
|---|
| 254 | DBGFR3InfoRegisterInternal(pVM, "ldt", "Displays the shadow LDT. No arguments.", &selmR3InfoLdt);
|
|---|
| 255 | DBGFR3InfoRegisterInternal(pVM, "ldtguest", "Displays the guest LDT. No arguments.", &selmR3InfoLdtGuest);
|
|---|
| 256 | //DBGFR3InfoRegisterInternal(pVM, "tss", "Displays the shadow TSS. No arguments.", &selmR3InfoTss);
|
|---|
| 257 | //DBGFR3InfoRegisterInternal(pVM, "tssguest", "Displays the guest TSS. No arguments.", &selmR3InfoTssGuest);
|
|---|
| 258 |
|
|---|
| 259 | return rc;
|
|---|
| 260 | }
|
|---|
| 261 |
|
|---|
| 262 |
|
|---|
| 263 | /**
|
|---|
| 264 | * Finalizes HMA page attributes.
|
|---|
| 265 | *
|
|---|
| 266 | * @returns VBox status code.
|
|---|
| 267 | * @param pVM Pointer to the VM.
|
|---|
| 268 | */
|
|---|
| 269 | VMMR3DECL(int) SELMR3InitFinalize(PVM pVM)
|
|---|
| 270 | {
|
|---|
| 271 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 272 | /** @cfgm{/DoubleFault,bool,false}
|
|---|
| 273 | * Enables catching of double faults in the raw-mode context VMM code. This can
|
|---|
| 274 | * be used when the triple faults or hangs occur and one suspect an unhandled
|
|---|
| 275 | * double fault. This is not enabled by default because it means making the
|
|---|
| 276 | * hyper selectors writeable for all supervisor code, including the guest's.
|
|---|
| 277 | * The double fault is a task switch and thus requires write access to the GDT
|
|---|
| 278 | * of the TSS (to set it busy), to the old TSS (to store state), and to the Trap
|
|---|
| 279 | * 8 TSS for the back link.
|
|---|
| 280 | */
|
|---|
| 281 | bool f;
|
|---|
| 282 | #if defined(DEBUG_bird)
|
|---|
| 283 | int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, true);
|
|---|
| 284 | #else
|
|---|
| 285 | int rc = CFGMR3QueryBoolDef(CFGMR3GetRoot(pVM), "DoubleFault", &f, false);
|
|---|
| 286 | #endif
|
|---|
| 287 | AssertLogRelRCReturn(rc, rc);
|
|---|
| 288 | if (f)
|
|---|
| 289 | {
|
|---|
| 290 | PX86DESC paGdt = pVM->selm.s.paGdtR3;
|
|---|
| 291 | rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3]), sizeof(paGdt[0]),
|
|---|
| 292 | X86_PTE_RW | X86_PTE_P | X86_PTE_A | X86_PTE_D);
|
|---|
| 293 | AssertRC(rc);
|
|---|
| 294 | rc = PGMMapSetPage(pVM, MMHyperR3ToRC(pVM, &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3]), sizeof(paGdt[0]),
|
|---|
| 295 | X86_PTE_RW | X86_PTE_P | X86_PTE_A | X86_PTE_D);
|
|---|
| 296 | AssertRC(rc);
|
|---|
| 297 | rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]),
|
|---|
| 298 | X86_PTE_RW | X86_PTE_P | X86_PTE_A | X86_PTE_D);
|
|---|
| 299 | AssertRC(rc);
|
|---|
| 300 | rc = PGMMapSetPage(pVM, VM_RC_ADDR(pVM, &pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]), sizeof(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]),
|
|---|
| 301 | X86_PTE_RW | X86_PTE_P | X86_PTE_A | X86_PTE_D);
|
|---|
| 302 | AssertRC(rc);
|
|---|
| 303 | }
|
|---|
| 304 | #endif /* VBOX_WITH_RAW_MODE */
|
|---|
| 305 | return VINF_SUCCESS;
|
|---|
| 306 | }
|
|---|
| 307 |
|
|---|
| 308 |
|
|---|
| 309 | /**
|
|---|
| 310 | * Setup the hypervisor GDT selectors in our shadow table
|
|---|
| 311 | *
|
|---|
| 312 | * @param pVM Pointer to the VM.
|
|---|
| 313 | */
|
|---|
| 314 | static void selmR3SetupHyperGDTSelectors(PVM pVM)
|
|---|
| 315 | {
|
|---|
| 316 | PX86DESC paGdt = pVM->selm.s.paGdtR3;
|
|---|
| 317 |
|
|---|
| 318 | /*
|
|---|
| 319 | * Set up global code and data descriptors for use in the guest context.
|
|---|
| 320 | * Both are wide open (base 0, limit 4GB)
|
|---|
| 321 | */
|
|---|
| 322 | PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> 3];
|
|---|
| 323 | pDesc->Gen.u16LimitLow = 0xffff;
|
|---|
| 324 | pDesc->Gen.u4LimitHigh = 0xf;
|
|---|
| 325 | pDesc->Gen.u16BaseLow = 0;
|
|---|
| 326 | pDesc->Gen.u8BaseHigh1 = 0;
|
|---|
| 327 | pDesc->Gen.u8BaseHigh2 = 0;
|
|---|
| 328 | pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
|
|---|
| 329 | pDesc->Gen.u1DescType = 1; /* not system, but code/data */
|
|---|
| 330 | pDesc->Gen.u2Dpl = 0; /* supervisor */
|
|---|
| 331 | pDesc->Gen.u1Present = 1;
|
|---|
| 332 | pDesc->Gen.u1Available = 0;
|
|---|
| 333 | pDesc->Gen.u1Long = 0;
|
|---|
| 334 | pDesc->Gen.u1DefBig = 1; /* def 32 bit */
|
|---|
| 335 | pDesc->Gen.u1Granularity = 1; /* 4KB limit */
|
|---|
| 336 |
|
|---|
| 337 | /* data */
|
|---|
| 338 | pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> 3];
|
|---|
| 339 | pDesc->Gen.u16LimitLow = 0xffff;
|
|---|
| 340 | pDesc->Gen.u4LimitHigh = 0xf;
|
|---|
| 341 | pDesc->Gen.u16BaseLow = 0;
|
|---|
| 342 | pDesc->Gen.u8BaseHigh1 = 0;
|
|---|
| 343 | pDesc->Gen.u8BaseHigh2 = 0;
|
|---|
| 344 | pDesc->Gen.u4Type = X86_SEL_TYPE_RW_ACC;
|
|---|
| 345 | pDesc->Gen.u1DescType = 1; /* not system, but code/data */
|
|---|
| 346 | pDesc->Gen.u2Dpl = 0; /* supervisor */
|
|---|
| 347 | pDesc->Gen.u1Present = 1;
|
|---|
| 348 | pDesc->Gen.u1Available = 0;
|
|---|
| 349 | pDesc->Gen.u1Long = 0;
|
|---|
| 350 | pDesc->Gen.u1DefBig = 1; /* big */
|
|---|
| 351 | pDesc->Gen.u1Granularity = 1; /* 4KB limit */
|
|---|
| 352 |
|
|---|
| 353 | /* 64-bit mode code (& data?) */
|
|---|
| 354 | pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> 3];
|
|---|
| 355 | pDesc->Gen.u16LimitLow = 0xffff;
|
|---|
| 356 | pDesc->Gen.u4LimitHigh = 0xf;
|
|---|
| 357 | pDesc->Gen.u16BaseLow = 0;
|
|---|
| 358 | pDesc->Gen.u8BaseHigh1 = 0;
|
|---|
| 359 | pDesc->Gen.u8BaseHigh2 = 0;
|
|---|
| 360 | pDesc->Gen.u4Type = X86_SEL_TYPE_ER_ACC;
|
|---|
| 361 | pDesc->Gen.u1DescType = 1; /* not system, but code/data */
|
|---|
| 362 | pDesc->Gen.u2Dpl = 0; /* supervisor */
|
|---|
| 363 | pDesc->Gen.u1Present = 1;
|
|---|
| 364 | pDesc->Gen.u1Available = 0;
|
|---|
| 365 | pDesc->Gen.u1Long = 1; /* The Long (L) attribute bit. */
|
|---|
| 366 | pDesc->Gen.u1DefBig = 0; /* With L=1 this must be 0. */
|
|---|
| 367 | pDesc->Gen.u1Granularity = 1; /* 4KB limit */
|
|---|
| 368 |
|
|---|
| 369 | /*
|
|---|
| 370 | * TSS descriptor
|
|---|
| 371 | */
|
|---|
| 372 | pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
|
|---|
| 373 | RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
|
|---|
| 374 | pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
|
|---|
| 375 | pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
|
|---|
| 376 | pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
|
|---|
| 377 | pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
|
|---|
| 378 | pDesc->Gen.u4LimitHigh = 0;
|
|---|
| 379 | pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
|
|---|
| 380 | pDesc->Gen.u1DescType = 0; /* system */
|
|---|
| 381 | pDesc->Gen.u2Dpl = 0; /* supervisor */
|
|---|
| 382 | pDesc->Gen.u1Present = 1;
|
|---|
| 383 | pDesc->Gen.u1Available = 0;
|
|---|
| 384 | pDesc->Gen.u1Long = 0;
|
|---|
| 385 | pDesc->Gen.u1DefBig = 0;
|
|---|
| 386 | pDesc->Gen.u1Granularity = 0; /* byte limit */
|
|---|
| 387 |
|
|---|
| 388 | /*
|
|---|
| 389 | * TSS descriptor for trap 08
|
|---|
| 390 | */
|
|---|
| 391 | pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> 3];
|
|---|
| 392 | pDesc->Gen.u16LimitLow = sizeof(VBOXTSS) - 1;
|
|---|
| 393 | pDesc->Gen.u4LimitHigh = 0;
|
|---|
| 394 | RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.TssTrap08);
|
|---|
| 395 | pDesc->Gen.u16BaseLow = RT_LOWORD(RCPtrTSS);
|
|---|
| 396 | pDesc->Gen.u8BaseHigh1 = RT_BYTE3(RCPtrTSS);
|
|---|
| 397 | pDesc->Gen.u8BaseHigh2 = RT_BYTE4(RCPtrTSS);
|
|---|
| 398 | pDesc->Gen.u4Type = X86_SEL_TYPE_SYS_386_TSS_AVAIL;
|
|---|
| 399 | pDesc->Gen.u1DescType = 0; /* system */
|
|---|
| 400 | pDesc->Gen.u2Dpl = 0; /* supervisor */
|
|---|
| 401 | pDesc->Gen.u1Present = 1;
|
|---|
| 402 | pDesc->Gen.u1Available = 0;
|
|---|
| 403 | pDesc->Gen.u1Long = 0;
|
|---|
| 404 | pDesc->Gen.u1DefBig = 0;
|
|---|
| 405 | pDesc->Gen.u1Granularity = 0; /* byte limit */
|
|---|
| 406 | }
|
|---|
| 407 |
|
|---|
| 408 | /**
|
|---|
| 409 | * Applies relocations to data and code managed by this
|
|---|
| 410 | * component. This function will be called at init and
|
|---|
| 411 | * whenever the VMM need to relocate it self inside the GC.
|
|---|
| 412 | *
|
|---|
| 413 | * @param pVM The VM.
|
|---|
| 414 | */
|
|---|
| 415 | VMMR3DECL(void) SELMR3Relocate(PVM pVM)
|
|---|
| 416 | {
|
|---|
| 417 | PX86DESC paGdt = pVM->selm.s.paGdtR3;
|
|---|
| 418 | LogFlow(("SELMR3Relocate\n"));
|
|---|
| 419 |
|
|---|
| 420 | for (VMCPUID i = 0; i < pVM->cCpus; i++)
|
|---|
| 421 | {
|
|---|
| 422 | PVMCPU pVCpu = &pVM->aCpus[i];
|
|---|
| 423 |
|
|---|
| 424 | /*
|
|---|
| 425 | * Update GDTR and selector.
|
|---|
| 426 | */
|
|---|
| 427 | CPUMSetHyperGDTR(pVCpu, MMHyperR3ToRC(pVM, paGdt), SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1);
|
|---|
| 428 |
|
|---|
| 429 | /** @todo selector relocations should be a separate operation? */
|
|---|
| 430 | CPUMSetHyperCS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]);
|
|---|
| 431 | CPUMSetHyperDS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
|
|---|
| 432 | CPUMSetHyperES(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
|
|---|
| 433 | CPUMSetHyperSS(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]);
|
|---|
| 434 | CPUMSetHyperTR(pVCpu, pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]);
|
|---|
| 435 | }
|
|---|
| 436 |
|
|---|
| 437 | selmR3SetupHyperGDTSelectors(pVM);
|
|---|
| 438 |
|
|---|
| 439 | /** @todo SELM must be called when any of the CR3s changes during a cpu mode change. */
|
|---|
| 440 | /** @todo PGM knows the proper CR3 values these days, not CPUM. */
|
|---|
| 441 | /*
|
|---|
| 442 | * Update the TSSes.
|
|---|
| 443 | */
|
|---|
| 444 | /* Only applies to raw mode which supports only 1 VCPU */
|
|---|
| 445 | PVMCPU pVCpu = &pVM->aCpus[0];
|
|---|
| 446 |
|
|---|
| 447 | /* Current TSS */
|
|---|
| 448 | pVM->selm.s.Tss.cr3 = PGMGetHyperCR3(pVCpu);
|
|---|
| 449 | pVM->selm.s.Tss.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 450 | pVM->selm.s.Tss.esp0 = VMMGetStackRC(pVCpu);
|
|---|
| 451 | pVM->selm.s.Tss.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
|
|---|
| 452 | pVM->selm.s.Tss.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 453 | pVM->selm.s.Tss.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 454 | pVM->selm.s.Tss.offIoBitmap = sizeof(VBOXTSS);
|
|---|
| 455 |
|
|---|
| 456 | /* trap 08 */
|
|---|
| 457 | pVM->selm.s.TssTrap08.cr3 = PGMGetInterRCCR3(pVM, pVCpu); /* this should give use better survival chances. */
|
|---|
| 458 | pVM->selm.s.TssTrap08.ss0 = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 459 | pVM->selm.s.TssTrap08.ss = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 460 | pVM->selm.s.TssTrap08.esp0 = VMMGetStackRC(pVCpu) - PAGE_SIZE / 2; /* upper half can be analysed this way. */
|
|---|
| 461 | pVM->selm.s.TssTrap08.esp = pVM->selm.s.TssTrap08.esp0;
|
|---|
| 462 | pVM->selm.s.TssTrap08.ebp = pVM->selm.s.TssTrap08.esp0;
|
|---|
| 463 | pVM->selm.s.TssTrap08.cs = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS];
|
|---|
| 464 | pVM->selm.s.TssTrap08.ds = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 465 | pVM->selm.s.TssTrap08.es = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 466 | pVM->selm.s.TssTrap08.fs = 0;
|
|---|
| 467 | pVM->selm.s.TssTrap08.gs = 0;
|
|---|
| 468 | pVM->selm.s.TssTrap08.selLdt = 0;
|
|---|
| 469 | pVM->selm.s.TssTrap08.eflags = 0x2; /* all cleared */
|
|---|
| 470 | pVM->selm.s.TssTrap08.ecx = VM_RC_ADDR(pVM, &pVM->selm.s.Tss); /* setup ecx to normal Hypervisor TSS address. */
|
|---|
| 471 | pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.ecx;
|
|---|
| 472 | pVM->selm.s.TssTrap08.eax = pVM->selm.s.TssTrap08.ecx;
|
|---|
| 473 | pVM->selm.s.TssTrap08.edx = VM_RC_ADDR(pVM, pVM); /* setup edx VM address. */
|
|---|
| 474 | pVM->selm.s.TssTrap08.edi = pVM->selm.s.TssTrap08.edx;
|
|---|
| 475 | pVM->selm.s.TssTrap08.ebx = pVM->selm.s.TssTrap08.edx;
|
|---|
| 476 | pVM->selm.s.TssTrap08.offIoBitmap = sizeof(VBOXTSS);
|
|---|
| 477 | /* TRPM will be updating the eip */
|
|---|
| 478 |
|
|---|
| 479 | if ( !pVM->selm.s.fDisableMonitoring
|
|---|
| 480 | && !VMMIsHwVirtExtForced(pVM))
|
|---|
| 481 | {
|
|---|
| 482 | /*
|
|---|
| 483 | * Update shadow GDT/LDT/TSS write access handlers.
|
|---|
| 484 | */
|
|---|
| 485 | int rc; NOREF(rc);
|
|---|
| 486 | #ifdef SELM_TRACK_SHADOW_GDT_CHANGES
|
|---|
| 487 | if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
|
|---|
| 488 | {
|
|---|
| 489 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
|
|---|
| 490 | AssertRC(rc);
|
|---|
| 491 | }
|
|---|
| 492 | pVM->selm.s.paGdtRC = MMHyperR3ToRC(pVM, paGdt);
|
|---|
| 493 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.paGdtRC,
|
|---|
| 494 | pVM->selm.s.paGdtRC + SELM_GDT_ELEMENTS * sizeof(paGdt[0]) - 1,
|
|---|
| 495 | 0, 0, "selmRCShadowGDTWriteHandler", 0, "Shadow GDT write access handler");
|
|---|
| 496 | AssertRC(rc);
|
|---|
| 497 | #endif
|
|---|
| 498 | #ifdef SELM_TRACK_SHADOW_TSS_CHANGES
|
|---|
| 499 | if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
|
|---|
| 500 | {
|
|---|
| 501 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
|
|---|
| 502 | AssertRC(rc);
|
|---|
| 503 | }
|
|---|
| 504 | pVM->selm.s.pvMonShwTssRC = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
|
|---|
| 505 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvMonShwTssRC,
|
|---|
| 506 | pVM->selm.s.pvMonShwTssRC + sizeof(pVM->selm.s.Tss) - 1,
|
|---|
| 507 | 0, 0, "selmRCShadowTSSWriteHandler", 0, "Shadow TSS write access handler");
|
|---|
| 508 | AssertRC(rc);
|
|---|
| 509 | #endif
|
|---|
| 510 |
|
|---|
| 511 | /*
|
|---|
| 512 | * Update the GC LDT region handler and address.
|
|---|
| 513 | */
|
|---|
| 514 | #ifdef SELM_TRACK_SHADOW_LDT_CHANGES
|
|---|
| 515 | if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
|
|---|
| 516 | {
|
|---|
| 517 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
|
|---|
| 518 | AssertRC(rc);
|
|---|
| 519 | }
|
|---|
| 520 | #endif
|
|---|
| 521 | pVM->selm.s.pvLdtRC = MMHyperR3ToRC(pVM, pVM->selm.s.pvLdtR3);
|
|---|
| 522 | #ifdef SELM_TRACK_SHADOW_LDT_CHANGES
|
|---|
| 523 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_HYPERVISOR, pVM->selm.s.pvLdtRC,
|
|---|
| 524 | pVM->selm.s.pvLdtRC + _64K + PAGE_SIZE - 1,
|
|---|
| 525 | 0, 0, "selmRCShadowLDTWriteHandler", 0, "Shadow LDT write access handler");
|
|---|
| 526 | AssertRC(rc);
|
|---|
| 527 | #endif
|
|---|
| 528 | }
|
|---|
| 529 | }
|
|---|
| 530 |
|
|---|
| 531 |
|
|---|
| 532 | /**
|
|---|
| 533 | * Terminates the SELM.
|
|---|
| 534 | *
|
|---|
| 535 | * Termination means cleaning up and freeing all resources,
|
|---|
| 536 | * the VM it self is at this point powered off or suspended.
|
|---|
| 537 | *
|
|---|
| 538 | * @returns VBox status code.
|
|---|
| 539 | * @param pVM Pointer to the VM.
|
|---|
| 540 | */
|
|---|
| 541 | VMMR3DECL(int) SELMR3Term(PVM pVM)
|
|---|
| 542 | {
|
|---|
| 543 | NOREF(pVM);
|
|---|
| 544 | return 0;
|
|---|
| 545 | }
|
|---|
| 546 |
|
|---|
| 547 |
|
|---|
| 548 | /**
|
|---|
| 549 | * The VM is being reset.
|
|---|
| 550 | *
|
|---|
| 551 | * For the SELM component this means that any GDT/LDT/TSS monitors
|
|---|
| 552 | * needs to be removed.
|
|---|
| 553 | *
|
|---|
| 554 | * @param pVM Pointer to the VM.
|
|---|
| 555 | */
|
|---|
| 556 | VMMR3DECL(void) SELMR3Reset(PVM pVM)
|
|---|
| 557 | {
|
|---|
| 558 | LogFlow(("SELMR3Reset:\n"));
|
|---|
| 559 | VM_ASSERT_EMT(pVM);
|
|---|
| 560 |
|
|---|
| 561 | /*
|
|---|
| 562 | * Uninstall guest GDT/LDT/TSS write access handlers.
|
|---|
| 563 | */
|
|---|
| 564 | int rc = VINF_SUCCESS;
|
|---|
| 565 | if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
|
|---|
| 566 | {
|
|---|
| 567 | #ifdef SELM_TRACK_GUEST_GDT_CHANGES
|
|---|
| 568 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
|
|---|
| 569 | AssertRC(rc);
|
|---|
| 570 | #endif
|
|---|
| 571 | pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
|
|---|
| 572 | pVM->selm.s.GuestGdtr.cbGdt = 0;
|
|---|
| 573 | }
|
|---|
| 574 | pVM->selm.s.fGDTRangeRegistered = false;
|
|---|
| 575 | if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
|
|---|
| 576 | {
|
|---|
| 577 | #ifdef SELM_TRACK_GUEST_LDT_CHANGES
|
|---|
| 578 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
|
|---|
| 579 | AssertRC(rc);
|
|---|
| 580 | #endif
|
|---|
| 581 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
|
|---|
| 582 | }
|
|---|
| 583 | if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
|
|---|
| 584 | {
|
|---|
| 585 | #ifdef SELM_TRACK_GUEST_TSS_CHANGES
|
|---|
| 586 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
|
|---|
| 587 | AssertRC(rc);
|
|---|
| 588 | #endif
|
|---|
| 589 | pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
|
|---|
| 590 | pVM->selm.s.GCSelTss = RTSEL_MAX;
|
|---|
| 591 | }
|
|---|
| 592 |
|
|---|
| 593 | /*
|
|---|
| 594 | * Re-initialize other members.
|
|---|
| 595 | */
|
|---|
| 596 | pVM->selm.s.cbLdtLimit = 0;
|
|---|
| 597 | pVM->selm.s.offLdtHyper = 0;
|
|---|
| 598 | pVM->selm.s.cbMonitoredGuestTss = 0;
|
|---|
| 599 |
|
|---|
| 600 | pVM->selm.s.fSyncTSSRing0Stack = false;
|
|---|
| 601 |
|
|---|
| 602 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 603 | /*
|
|---|
| 604 | * Default action when entering raw mode for the first time
|
|---|
| 605 | */
|
|---|
| 606 | PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
|
|---|
| 607 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 608 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 609 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 610 | #endif
|
|---|
| 611 | }
|
|---|
| 612 |
|
|---|
| 613 |
|
|---|
| 614 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 615 | /**
|
|---|
| 616 | * Disable GDT/LDT/TSS monitoring and syncing
|
|---|
| 617 | *
|
|---|
| 618 | * @param pVM Pointer to the VM.
|
|---|
| 619 | */
|
|---|
| 620 | VMMR3DECL(void) SELMR3DisableMonitoring(PVM pVM)
|
|---|
| 621 | {
|
|---|
| 622 | /*
|
|---|
| 623 | * Uninstall guest GDT/LDT/TSS write access handlers.
|
|---|
| 624 | */
|
|---|
| 625 | int rc;
|
|---|
| 626 | if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
|
|---|
| 627 | {
|
|---|
| 628 | # ifdef SELM_TRACK_GUEST_GDT_CHANGES
|
|---|
| 629 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
|
|---|
| 630 | AssertRC(rc);
|
|---|
| 631 | # endif
|
|---|
| 632 | pVM->selm.s.GuestGdtr.pGdt = RTRCPTR_MAX;
|
|---|
| 633 | pVM->selm.s.GuestGdtr.cbGdt = 0;
|
|---|
| 634 | }
|
|---|
| 635 | pVM->selm.s.fGDTRangeRegistered = false;
|
|---|
| 636 | if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
|
|---|
| 637 | {
|
|---|
| 638 | # ifdef SELM_TRACK_GUEST_LDT_CHANGES
|
|---|
| 639 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
|
|---|
| 640 | AssertRC(rc);
|
|---|
| 641 | # endif
|
|---|
| 642 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
|
|---|
| 643 | }
|
|---|
| 644 | if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
|
|---|
| 645 | {
|
|---|
| 646 | # ifdef SELM_TRACK_GUEST_TSS_CHANGES
|
|---|
| 647 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
|
|---|
| 648 | AssertRC(rc);
|
|---|
| 649 | # endif
|
|---|
| 650 | pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
|
|---|
| 651 | pVM->selm.s.GCSelTss = RTSEL_MAX;
|
|---|
| 652 | }
|
|---|
| 653 |
|
|---|
| 654 | /*
|
|---|
| 655 | * Unregister shadow GDT/LDT/TSS write access handlers.
|
|---|
| 656 | */
|
|---|
| 657 | # ifdef SELM_TRACK_SHADOW_GDT_CHANGES
|
|---|
| 658 | if (pVM->selm.s.paGdtRC != NIL_RTRCPTR)
|
|---|
| 659 | {
|
|---|
| 660 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.paGdtRC);
|
|---|
| 661 | AssertRC(rc);
|
|---|
| 662 | pVM->selm.s.paGdtRC = NIL_RTRCPTR;
|
|---|
| 663 | }
|
|---|
| 664 | # endif
|
|---|
| 665 | # ifdef SELM_TRACK_SHADOW_TSS_CHANGES
|
|---|
| 666 | if (pVM->selm.s.pvMonShwTssRC != RTRCPTR_MAX)
|
|---|
| 667 | {
|
|---|
| 668 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvMonShwTssRC);
|
|---|
| 669 | AssertRC(rc);
|
|---|
| 670 | pVM->selm.s.pvMonShwTssRC = RTRCPTR_MAX;
|
|---|
| 671 | }
|
|---|
| 672 | # endif
|
|---|
| 673 | # ifdef SELM_TRACK_SHADOW_LDT_CHANGES
|
|---|
| 674 | if (pVM->selm.s.pvLdtRC != RTRCPTR_MAX)
|
|---|
| 675 | {
|
|---|
| 676 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.pvLdtRC);
|
|---|
| 677 | AssertRC(rc);
|
|---|
| 678 | pVM->selm.s.pvLdtRC = RTRCPTR_MAX;
|
|---|
| 679 | }
|
|---|
| 680 | # endif
|
|---|
| 681 |
|
|---|
| 682 | PVMCPU pVCpu = &pVM->aCpus[0]; /* raw mode implies on VCPU */
|
|---|
| 683 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 684 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 685 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 686 |
|
|---|
| 687 | pVM->selm.s.fDisableMonitoring = true;
|
|---|
| 688 | }
|
|---|
| 689 | #endif /* VBOX_WITH_RAW_MODE */
|
|---|
| 690 |
|
|---|
| 691 |
|
|---|
| 692 | /**
|
|---|
| 693 | * Execute state save operation.
|
|---|
| 694 | *
|
|---|
| 695 | * @returns VBox status code.
|
|---|
| 696 | * @param pVM Pointer to the VM.
|
|---|
| 697 | * @param pSSM SSM operation handle.
|
|---|
| 698 | */
|
|---|
| 699 | static DECLCALLBACK(int) selmR3Save(PVM pVM, PSSMHANDLE pSSM)
|
|---|
| 700 | {
|
|---|
| 701 | LogFlow(("selmR3Save:\n"));
|
|---|
| 702 |
|
|---|
| 703 | /*
|
|---|
| 704 | * Save the basic bits - fortunately all the other things can be resynced on load.
|
|---|
| 705 | */
|
|---|
| 706 | PSELM pSelm = &pVM->selm.s;
|
|---|
| 707 |
|
|---|
| 708 | SSMR3PutBool(pSSM, pSelm->fDisableMonitoring);
|
|---|
| 709 | SSMR3PutBool(pSSM, pSelm->fSyncTSSRing0Stack);
|
|---|
| 710 | SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS]);
|
|---|
| 711 | SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_DS]);
|
|---|
| 712 | SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]);
|
|---|
| 713 | SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_CS64]); /* reserved for DS64. */
|
|---|
| 714 | SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS]);
|
|---|
| 715 | return SSMR3PutSel(pSSM, pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08]);
|
|---|
| 716 | }
|
|---|
| 717 |
|
|---|
| 718 |
|
|---|
| 719 | /**
|
|---|
| 720 | * Execute state load operation.
|
|---|
| 721 | *
|
|---|
| 722 | * @returns VBox status code.
|
|---|
| 723 | * @param pVM Pointer to the VM.
|
|---|
| 724 | * @param pSSM SSM operation handle.
|
|---|
| 725 | * @param uVersion Data layout version.
|
|---|
| 726 | * @param uPass The data pass.
|
|---|
| 727 | */
|
|---|
| 728 | static DECLCALLBACK(int) selmR3Load(PVM pVM, PSSMHANDLE pSSM, uint32_t uVersion, uint32_t uPass)
|
|---|
| 729 | {
|
|---|
| 730 | LogFlow(("selmR3Load:\n"));
|
|---|
| 731 | Assert(uPass == SSM_PASS_FINAL); NOREF(uPass);
|
|---|
| 732 |
|
|---|
| 733 | /*
|
|---|
| 734 | * Validate version.
|
|---|
| 735 | */
|
|---|
| 736 | if (uVersion != SELM_SAVED_STATE_VERSION)
|
|---|
| 737 | {
|
|---|
| 738 | AssertMsgFailed(("selmR3Load: Invalid version uVersion=%d!\n", uVersion));
|
|---|
| 739 | return VERR_SSM_UNSUPPORTED_DATA_UNIT_VERSION;
|
|---|
| 740 | }
|
|---|
| 741 |
|
|---|
| 742 | /*
|
|---|
| 743 | * Do a reset.
|
|---|
| 744 | */
|
|---|
| 745 | SELMR3Reset(pVM);
|
|---|
| 746 |
|
|---|
| 747 | /* Get the monitoring flag. */
|
|---|
| 748 | SSMR3GetBool(pSSM, &pVM->selm.s.fDisableMonitoring);
|
|---|
| 749 |
|
|---|
| 750 | /* Get the TSS state flag. */
|
|---|
| 751 | SSMR3GetBool(pSSM, &pVM->selm.s.fSyncTSSRing0Stack);
|
|---|
| 752 |
|
|---|
| 753 | /*
|
|---|
| 754 | * Get the selectors.
|
|---|
| 755 | */
|
|---|
| 756 | RTSEL SelCS;
|
|---|
| 757 | SSMR3GetSel(pSSM, &SelCS);
|
|---|
| 758 | RTSEL SelDS;
|
|---|
| 759 | SSMR3GetSel(pSSM, &SelDS);
|
|---|
| 760 | RTSEL SelCS64;
|
|---|
| 761 | SSMR3GetSel(pSSM, &SelCS64);
|
|---|
| 762 | RTSEL SelDS64;
|
|---|
| 763 | SSMR3GetSel(pSSM, &SelDS64);
|
|---|
| 764 | RTSEL SelTSS;
|
|---|
| 765 | SSMR3GetSel(pSSM, &SelTSS);
|
|---|
| 766 | RTSEL SelTSSTrap08;
|
|---|
| 767 | SSMR3GetSel(pSSM, &SelTSSTrap08);
|
|---|
| 768 |
|
|---|
| 769 | /* Copy the selectors; they will be checked during relocation. */
|
|---|
| 770 | PSELM pSelm = &pVM->selm.s;
|
|---|
| 771 | pSelm->aHyperSel[SELM_HYPER_SEL_CS] = SelCS;
|
|---|
| 772 | pSelm->aHyperSel[SELM_HYPER_SEL_DS] = SelDS;
|
|---|
| 773 | pSelm->aHyperSel[SELM_HYPER_SEL_CS64] = SelCS64;
|
|---|
| 774 | pSelm->aHyperSel[SELM_HYPER_SEL_TSS] = SelTSS;
|
|---|
| 775 | pSelm->aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SelTSSTrap08;
|
|---|
| 776 |
|
|---|
| 777 | return VINF_SUCCESS;
|
|---|
| 778 | }
|
|---|
| 779 |
|
|---|
| 780 |
|
|---|
| 781 | /**
|
|---|
| 782 | * Sync the GDT, LDT and TSS after loading the state.
|
|---|
| 783 | *
|
|---|
| 784 | * Just to play save, we set the FFs to force syncing before
|
|---|
| 785 | * executing GC code.
|
|---|
| 786 | *
|
|---|
| 787 | * @returns VBox status code.
|
|---|
| 788 | * @param pVM Pointer to the VM.
|
|---|
| 789 | * @param pSSM SSM operation handle.
|
|---|
| 790 | */
|
|---|
| 791 | static DECLCALLBACK(int) selmR3LoadDone(PVM pVM, PSSMHANDLE pSSM)
|
|---|
| 792 | {
|
|---|
| 793 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 794 | PVMCPU pVCpu = VMMGetCpu(pVM);
|
|---|
| 795 |
|
|---|
| 796 | LogFlow(("selmR3LoadDone:\n"));
|
|---|
| 797 |
|
|---|
| 798 | /*
|
|---|
| 799 | * Don't do anything if it's a load failure.
|
|---|
| 800 | */
|
|---|
| 801 | int rc = SSMR3HandleGetStatus(pSSM);
|
|---|
| 802 | if (RT_FAILURE(rc))
|
|---|
| 803 | return VINF_SUCCESS;
|
|---|
| 804 |
|
|---|
| 805 | /*
|
|---|
| 806 | * Do the syncing if we're in protected mode.
|
|---|
| 807 | */
|
|---|
| 808 | if (PGMGetGuestMode(pVCpu) != PGMMODE_REAL)
|
|---|
| 809 | {
|
|---|
| 810 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 811 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 812 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 813 | SELMR3UpdateFromCPUM(pVM, pVCpu);
|
|---|
| 814 | }
|
|---|
| 815 |
|
|---|
| 816 | /*
|
|---|
| 817 | * Flag everything for resync on next raw mode entry.
|
|---|
| 818 | */
|
|---|
| 819 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 820 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 821 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 822 |
|
|---|
| 823 | #endif /*VBOX_WITH_RAW_MODE*/
|
|---|
| 824 | return VINF_SUCCESS;
|
|---|
| 825 | }
|
|---|
| 826 |
|
|---|
| 827 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 828 |
|
|---|
| 829 | /**
|
|---|
| 830 | * Updates (syncs) the shadow GDT.
|
|---|
| 831 | *
|
|---|
| 832 | * @returns VBox status code.
|
|---|
| 833 | * @param pVM The VM handle.
|
|---|
| 834 | * @param pVCpu The current virtual CPU.
|
|---|
| 835 | */
|
|---|
| 836 | static int selmR3UpdateShadowGdt(PVM pVM, PVMCPU pVCpu)
|
|---|
| 837 | {
|
|---|
| 838 | /*
|
|---|
| 839 | * Always assume the best...
|
|---|
| 840 | */
|
|---|
| 841 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 842 |
|
|---|
| 843 | /* If the GDT was changed, then make sure the LDT is checked too */
|
|---|
| 844 | /** @todo only do this if the actual ldtr selector was changed; this is a bit excessive */
|
|---|
| 845 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 846 | /* Same goes for the TSS selector */
|
|---|
| 847 | VMCPU_FF_SET(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 848 |
|
|---|
| 849 | /*
|
|---|
| 850 | * Get the GDTR and check if there is anything to do (there usually is).
|
|---|
| 851 | */
|
|---|
| 852 | VBOXGDTR GDTR;
|
|---|
| 853 | CPUMGetGuestGDTR(pVCpu, &GDTR);
|
|---|
| 854 | if (GDTR.cbGdt < sizeof(X86DESC))
|
|---|
| 855 | {
|
|---|
| 856 | Log(("No GDT entries...\n"));
|
|---|
| 857 | return VINF_SUCCESS;
|
|---|
| 858 | }
|
|---|
| 859 |
|
|---|
| 860 | /*
|
|---|
| 861 | * Read the Guest GDT.
|
|---|
| 862 | * ASSUMES that the entire GDT is in memory.
|
|---|
| 863 | */
|
|---|
| 864 | RTUINT cbEffLimit = GDTR.cbGdt;
|
|---|
| 865 | PX86DESC pGDTE = &pVM->selm.s.paGdtR3[1];
|
|---|
| 866 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, pGDTE, GDTR.pGdt + sizeof(X86DESC), cbEffLimit + 1 - sizeof(X86DESC));
|
|---|
| 867 | if (RT_FAILURE(rc))
|
|---|
| 868 | {
|
|---|
| 869 | /*
|
|---|
| 870 | * Read it page by page.
|
|---|
| 871 | *
|
|---|
| 872 | * Keep track of the last valid page and delay memsets and
|
|---|
| 873 | * adjust cbEffLimit to reflect the effective size. The latter
|
|---|
| 874 | * is something we do in the belief that the guest will probably
|
|---|
| 875 | * never actually commit the last page, thus allowing us to keep
|
|---|
| 876 | * our selectors in the high end of the GDT.
|
|---|
| 877 | */
|
|---|
| 878 | RTUINT cbLeft = cbEffLimit + 1 - sizeof(X86DESC);
|
|---|
| 879 | RTGCPTR GCPtrSrc = (RTGCPTR)GDTR.pGdt + sizeof(X86DESC);
|
|---|
| 880 | uint8_t *pu8Dst = (uint8_t *)&pVM->selm.s.paGdtR3[1];
|
|---|
| 881 | uint8_t *pu8DstInvalid = pu8Dst;
|
|---|
| 882 |
|
|---|
| 883 | while (cbLeft)
|
|---|
| 884 | {
|
|---|
| 885 | RTUINT cb = PAGE_SIZE - (GCPtrSrc & PAGE_OFFSET_MASK);
|
|---|
| 886 | cb = RT_MIN(cb, cbLeft);
|
|---|
| 887 | rc = PGMPhysSimpleReadGCPtr(pVCpu, pu8Dst, GCPtrSrc, cb);
|
|---|
| 888 | if (RT_SUCCESS(rc))
|
|---|
| 889 | {
|
|---|
| 890 | if (pu8DstInvalid != pu8Dst)
|
|---|
| 891 | RT_BZERO(pu8DstInvalid, pu8Dst - pu8DstInvalid);
|
|---|
| 892 | GCPtrSrc += cb;
|
|---|
| 893 | pu8Dst += cb;
|
|---|
| 894 | pu8DstInvalid = pu8Dst;
|
|---|
| 895 | }
|
|---|
| 896 | else if ( rc == VERR_PAGE_NOT_PRESENT
|
|---|
| 897 | || rc == VERR_PAGE_TABLE_NOT_PRESENT)
|
|---|
| 898 | {
|
|---|
| 899 | GCPtrSrc += cb;
|
|---|
| 900 | pu8Dst += cb;
|
|---|
| 901 | }
|
|---|
| 902 | else
|
|---|
| 903 | {
|
|---|
| 904 | AssertLogRelMsgFailed(("Couldn't read GDT at %016RX64, rc=%Rrc!\n", GDTR.pGdt, rc));
|
|---|
| 905 | return VERR_SELM_GDT_READ_ERROR;
|
|---|
| 906 | }
|
|---|
| 907 | cbLeft -= cb;
|
|---|
| 908 | }
|
|---|
| 909 |
|
|---|
| 910 | /* any invalid pages at the end? */
|
|---|
| 911 | if (pu8DstInvalid != pu8Dst)
|
|---|
| 912 | {
|
|---|
| 913 | cbEffLimit = pu8DstInvalid - (uint8_t *)pVM->selm.s.paGdtR3 - 1;
|
|---|
| 914 | /* If any GDTEs was invalidated, zero them. */
|
|---|
| 915 | if (cbEffLimit < pVM->selm.s.cbEffGuestGdtLimit)
|
|---|
| 916 | RT_BZERO(pu8DstInvalid + cbEffLimit + 1, pVM->selm.s.cbEffGuestGdtLimit - cbEffLimit);
|
|---|
| 917 | }
|
|---|
| 918 |
|
|---|
| 919 | /* keep track of the effective limit. */
|
|---|
| 920 | if (cbEffLimit != pVM->selm.s.cbEffGuestGdtLimit)
|
|---|
| 921 | {
|
|---|
| 922 | Log(("SELMR3UpdateFromCPUM: cbEffGuestGdtLimit=%#x -> %#x (actual %#x)\n",
|
|---|
| 923 | pVM->selm.s.cbEffGuestGdtLimit, cbEffLimit, GDTR.cbGdt));
|
|---|
| 924 | pVM->selm.s.cbEffGuestGdtLimit = cbEffLimit;
|
|---|
| 925 | }
|
|---|
| 926 | }
|
|---|
| 927 |
|
|---|
| 928 | /*
|
|---|
| 929 | * Check if the Guest GDT intrudes on our GDT entries.
|
|---|
| 930 | */
|
|---|
| 931 | /** @todo we should try to minimize relocations by making sure our current selectors can be reused. */
|
|---|
| 932 | RTSEL aHyperSel[SELM_HYPER_SEL_MAX];
|
|---|
| 933 | if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
|
|---|
| 934 | {
|
|---|
| 935 | PX86DESC pGDTEStart = pVM->selm.s.paGdtR3;
|
|---|
| 936 | PX86DESC pGDTECur = (PX86DESC)((char *)pGDTEStart + GDTR.cbGdt + 1 - sizeof(X86DESC));
|
|---|
| 937 | int iGDT = 0;
|
|---|
| 938 |
|
|---|
| 939 | Log(("Internal SELM GDT conflict: use non-present entries\n"));
|
|---|
| 940 | STAM_REL_COUNTER_INC(&pVM->selm.s.StatScanForHyperSels);
|
|---|
| 941 | while (pGDTECur > pGDTEStart)
|
|---|
| 942 | {
|
|---|
| 943 | /* We can reuse non-present entries */
|
|---|
| 944 | if (!pGDTECur->Gen.u1Present)
|
|---|
| 945 | {
|
|---|
| 946 | aHyperSel[iGDT] = ((uintptr_t)pGDTECur - (uintptr_t)pVM->selm.s.paGdtR3) / sizeof(X86DESC);
|
|---|
| 947 | aHyperSel[iGDT] = aHyperSel[iGDT] << X86_SEL_SHIFT;
|
|---|
| 948 | Log(("SELM: Found unused GDT %04X\n", aHyperSel[iGDT]));
|
|---|
| 949 | iGDT++;
|
|---|
| 950 | if (iGDT >= SELM_HYPER_SEL_MAX)
|
|---|
| 951 | break;
|
|---|
| 952 | }
|
|---|
| 953 |
|
|---|
| 954 | pGDTECur--;
|
|---|
| 955 | }
|
|---|
| 956 | if (iGDT != SELM_HYPER_SEL_MAX)
|
|---|
| 957 | {
|
|---|
| 958 | AssertLogRelMsgFailed(("Internal SELM GDT conflict.\n"));
|
|---|
| 959 | return VERR_SELM_GDT_TOO_FULL;
|
|---|
| 960 | }
|
|---|
| 961 | }
|
|---|
| 962 | else
|
|---|
| 963 | {
|
|---|
| 964 | aHyperSel[SELM_HYPER_SEL_CS] = SELM_HYPER_DEFAULT_SEL_CS;
|
|---|
| 965 | aHyperSel[SELM_HYPER_SEL_DS] = SELM_HYPER_DEFAULT_SEL_DS;
|
|---|
| 966 | aHyperSel[SELM_HYPER_SEL_CS64] = SELM_HYPER_DEFAULT_SEL_CS64;
|
|---|
| 967 | aHyperSel[SELM_HYPER_SEL_TSS] = SELM_HYPER_DEFAULT_SEL_TSS;
|
|---|
| 968 | aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = SELM_HYPER_DEFAULT_SEL_TSS_TRAP08;
|
|---|
| 969 | }
|
|---|
| 970 |
|
|---|
| 971 | #ifdef VBOX_WITH_SAFE_STR
|
|---|
| 972 | /* Use the guest's TR selector to plug the str virtualization hole. */
|
|---|
| 973 | if (CPUMGetGuestTR(pVCpu, NULL) != 0)
|
|---|
| 974 | {
|
|---|
| 975 | Log(("SELM: Use guest TSS selector %x\n", CPUMGetGuestTR(pVCpu, NULL)));
|
|---|
| 976 | aHyperSel[SELM_HYPER_SEL_TSS] = CPUMGetGuestTR(pVCpu, NULL);
|
|---|
| 977 | }
|
|---|
| 978 | #endif
|
|---|
| 979 |
|
|---|
| 980 | /*
|
|---|
| 981 | * Work thru the copied GDT entries adjusting them for correct virtualization.
|
|---|
| 982 | */
|
|---|
| 983 | PX86DESC pGDTEEnd = (PX86DESC)((char *)pGDTE + cbEffLimit + 1 - sizeof(X86DESC));
|
|---|
| 984 | while (pGDTE < pGDTEEnd)
|
|---|
| 985 | {
|
|---|
| 986 | if (pGDTE->Gen.u1Present)
|
|---|
| 987 | selmGuestToShadowDesc(pVM, pGDTE);
|
|---|
| 988 |
|
|---|
| 989 | /* Next GDT entry. */
|
|---|
| 990 | pGDTE++;
|
|---|
| 991 | }
|
|---|
| 992 |
|
|---|
| 993 | /*
|
|---|
| 994 | * Check if our hypervisor selectors were changed.
|
|---|
| 995 | */
|
|---|
| 996 | if ( aHyperSel[SELM_HYPER_SEL_CS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS]
|
|---|
| 997 | || aHyperSel[SELM_HYPER_SEL_DS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS]
|
|---|
| 998 | || aHyperSel[SELM_HYPER_SEL_CS64] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64]
|
|---|
| 999 | || aHyperSel[SELM_HYPER_SEL_TSS] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS]
|
|---|
| 1000 | || aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] != pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08])
|
|---|
| 1001 | {
|
|---|
| 1002 | /* Reinitialize our hypervisor GDTs */
|
|---|
| 1003 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] = aHyperSel[SELM_HYPER_SEL_CS];
|
|---|
| 1004 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] = aHyperSel[SELM_HYPER_SEL_DS];
|
|---|
| 1005 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] = aHyperSel[SELM_HYPER_SEL_CS64];
|
|---|
| 1006 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] = aHyperSel[SELM_HYPER_SEL_TSS];
|
|---|
| 1007 | pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] = aHyperSel[SELM_HYPER_SEL_TSS_TRAP08];
|
|---|
| 1008 |
|
|---|
| 1009 | STAM_REL_COUNTER_INC(&pVM->selm.s.StatHyperSelsChanged);
|
|---|
| 1010 |
|
|---|
| 1011 | /*
|
|---|
| 1012 | * Do the relocation callbacks to let everyone update their hyper selector dependencies.
|
|---|
| 1013 | * (SELMR3Relocate will call selmR3SetupHyperGDTSelectors() for us.)
|
|---|
| 1014 | */
|
|---|
| 1015 | VMR3Relocate(pVM, 0);
|
|---|
| 1016 | }
|
|---|
| 1017 | else
|
|---|
| 1018 | #ifdef VBOX_WITH_SAFE_STR
|
|---|
| 1019 | if ( cbEffLimit >= SELM_HYPER_DEFAULT_BASE
|
|---|
| 1020 | || CPUMGetGuestTR(pVCpu, NULL) != 0) /* Our shadow TR entry was overwritten when we synced the guest's GDT. */
|
|---|
| 1021 | #else
|
|---|
| 1022 | if (cbEffLimit >= SELM_HYPER_DEFAULT_BASE)
|
|---|
| 1023 | #endif
|
|---|
| 1024 | /* We overwrote all entries above, so we have to save them again. */
|
|---|
| 1025 | selmR3SetupHyperGDTSelectors(pVM);
|
|---|
| 1026 |
|
|---|
| 1027 | /*
|
|---|
| 1028 | * Adjust the cached GDT limit.
|
|---|
| 1029 | * Any GDT entries which have been removed must be cleared.
|
|---|
| 1030 | */
|
|---|
| 1031 | if (pVM->selm.s.GuestGdtr.cbGdt != GDTR.cbGdt)
|
|---|
| 1032 | {
|
|---|
| 1033 | if (pVM->selm.s.GuestGdtr.cbGdt > GDTR.cbGdt)
|
|---|
| 1034 | RT_BZERO(pGDTE, pVM->selm.s.GuestGdtr.cbGdt - GDTR.cbGdt);
|
|---|
| 1035 | }
|
|---|
| 1036 |
|
|---|
| 1037 | /*
|
|---|
| 1038 | * Check if Guest's GDTR is changed.
|
|---|
| 1039 | */
|
|---|
| 1040 | if ( GDTR.pGdt != pVM->selm.s.GuestGdtr.pGdt
|
|---|
| 1041 | || GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
|
|---|
| 1042 | {
|
|---|
| 1043 | Log(("SELMR3UpdateFromCPUM: Guest's GDT is changed to pGdt=%016RX64 cbGdt=%08X\n", GDTR.pGdt, GDTR.cbGdt));
|
|---|
| 1044 |
|
|---|
| 1045 | #ifdef SELM_TRACK_GUEST_GDT_CHANGES
|
|---|
| 1046 | /*
|
|---|
| 1047 | * [Re]Register write virtual handler for guest's GDT.
|
|---|
| 1048 | */
|
|---|
| 1049 | if (pVM->selm.s.GuestGdtr.pGdt != RTRCPTR_MAX && pVM->selm.s.fGDTRangeRegistered)
|
|---|
| 1050 | {
|
|---|
| 1051 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GuestGdtr.pGdt);
|
|---|
| 1052 | AssertRC(rc);
|
|---|
| 1053 | }
|
|---|
| 1054 |
|
|---|
| 1055 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE,
|
|---|
| 1056 | GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
|
|---|
| 1057 | 0, selmR3GuestGDTWriteHandler, "selmRCGuestGDTWriteHandler", 0,
|
|---|
| 1058 | "Guest GDT write access handler");
|
|---|
| 1059 | # ifdef VBOX_WITH_RAW_RING1
|
|---|
| 1060 | /** @todo !HACK ALERT!
|
|---|
| 1061 | * Some guest OSes (QNX) share code and the GDT on the same page;
|
|---|
| 1062 | * PGMR3HandlerVirtualRegister doesn't support more than one handler,
|
|---|
| 1063 | * so we kick out the PATM handler as this one is more important.
|
|---|
| 1064 | * Fix this properly in PGMR3HandlerVirtualRegister?
|
|---|
| 1065 | */
|
|---|
| 1066 | if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
|
|---|
| 1067 | {
|
|---|
| 1068 | LogRel(("selmR3UpdateShadowGdt: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority GDT page monitor\n", GDTR.pGdt));
|
|---|
| 1069 | rc = PGMHandlerVirtualDeregister(pVM, GDTR.pGdt & PAGE_BASE_GC_MASK);
|
|---|
| 1070 | AssertRC(rc);
|
|---|
| 1071 |
|
|---|
| 1072 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE,
|
|---|
| 1073 | GDTR.pGdt, GDTR.pGdt + GDTR.cbGdt /* already inclusive */,
|
|---|
| 1074 | 0, selmR3GuestGDTWriteHandler, "selmRCGuestGDTWriteHandler", 0,
|
|---|
| 1075 | "Guest GDT write access handler");
|
|---|
| 1076 | }
|
|---|
| 1077 | # endif
|
|---|
| 1078 | if (RT_FAILURE(rc))
|
|---|
| 1079 | return rc;
|
|---|
| 1080 | #endif /* SELM_TRACK_GUEST_GDT_CHANGES */
|
|---|
| 1081 |
|
|---|
| 1082 | /* Update saved Guest GDTR. */
|
|---|
| 1083 | pVM->selm.s.GuestGdtr = GDTR;
|
|---|
| 1084 | pVM->selm.s.fGDTRangeRegistered = true;
|
|---|
| 1085 | }
|
|---|
| 1086 |
|
|---|
| 1087 | return VINF_SUCCESS;
|
|---|
| 1088 | }
|
|---|
| 1089 |
|
|---|
| 1090 |
|
|---|
| 1091 | /**
|
|---|
| 1092 | * Updates (syncs) the shadow LDT.
|
|---|
| 1093 | *
|
|---|
| 1094 | * @returns VBox status code.
|
|---|
| 1095 | * @param pVM The VM handle.
|
|---|
| 1096 | * @param pVCpu The current virtual CPU.
|
|---|
| 1097 | */
|
|---|
| 1098 | static int selmR3UpdateShadowLdt(PVM pVM, PVMCPU pVCpu)
|
|---|
| 1099 | {
|
|---|
| 1100 | int rc = VINF_SUCCESS;
|
|---|
| 1101 |
|
|---|
| 1102 | /*
|
|---|
| 1103 | * Always assume the best...
|
|---|
| 1104 | */
|
|---|
| 1105 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 1106 |
|
|---|
| 1107 | /*
|
|---|
| 1108 | * LDT handling is done similarly to the GDT handling with a shadow
|
|---|
| 1109 | * array. However, since the LDT is expected to be swappable (at least
|
|---|
| 1110 | * some ancient OSes makes it swappable) it must be floating and
|
|---|
| 1111 | * synced on a per-page basis.
|
|---|
| 1112 | *
|
|---|
| 1113 | * Eventually we will change this to be fully on demand. Meaning that
|
|---|
| 1114 | * we will only sync pages containing LDT selectors actually used and
|
|---|
| 1115 | * let the #PF handler lazily sync pages as they are used.
|
|---|
| 1116 | * (This applies to GDT too, when we start making OS/2 fast.)
|
|---|
| 1117 | */
|
|---|
| 1118 |
|
|---|
| 1119 | /*
|
|---|
| 1120 | * First, determine the current LDT selector.
|
|---|
| 1121 | */
|
|---|
| 1122 | RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
|
|---|
| 1123 | if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
|
|---|
| 1124 | {
|
|---|
| 1125 | /* ldtr = 0 - update hyper LDTR and deregister any active handler. */
|
|---|
| 1126 | CPUMSetHyperLDTR(pVCpu, 0);
|
|---|
| 1127 | if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
|
|---|
| 1128 | {
|
|---|
| 1129 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
|
|---|
| 1130 | AssertRC(rc);
|
|---|
| 1131 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
|
|---|
| 1132 | }
|
|---|
| 1133 | pVM->selm.s.cbLdtLimit = 0;
|
|---|
| 1134 | return VINF_SUCCESS;
|
|---|
| 1135 | }
|
|---|
| 1136 |
|
|---|
| 1137 | /*
|
|---|
| 1138 | * Get the LDT selector.
|
|---|
| 1139 | */
|
|---|
| 1140 | /** @todo this is wrong, use CPUMGetGuestLdtrEx */
|
|---|
| 1141 | PX86DESC pDesc = &pVM->selm.s.paGdtR3[SelLdt >> X86_SEL_SHIFT];
|
|---|
| 1142 | RTGCPTR GCPtrLdt = X86DESC_BASE(pDesc);
|
|---|
| 1143 | uint32_t cbLdt = X86DESC_LIMIT_G(pDesc);
|
|---|
| 1144 |
|
|---|
| 1145 | /*
|
|---|
| 1146 | * Validate it.
|
|---|
| 1147 | */
|
|---|
| 1148 | if ( !cbLdt
|
|---|
| 1149 | || SelLdt >= pVM->selm.s.GuestGdtr.cbGdt
|
|---|
| 1150 | || pDesc->Gen.u1DescType
|
|---|
| 1151 | || pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
|
|---|
| 1152 | {
|
|---|
| 1153 | AssertMsg(!cbLdt, ("Invalid LDT %04x!\n", SelLdt));
|
|---|
| 1154 |
|
|---|
| 1155 | /* cbLdt > 0:
|
|---|
| 1156 | * This is quite impossible, so we do as most people do when faced with
|
|---|
| 1157 | * the impossible, we simply ignore it.
|
|---|
| 1158 | */
|
|---|
| 1159 | CPUMSetHyperLDTR(pVCpu, 0);
|
|---|
| 1160 | if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
|
|---|
| 1161 | {
|
|---|
| 1162 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
|
|---|
| 1163 | AssertRC(rc);
|
|---|
| 1164 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
|
|---|
| 1165 | }
|
|---|
| 1166 | return VINF_SUCCESS;
|
|---|
| 1167 | }
|
|---|
| 1168 | /** @todo check what intel does about odd limits. */
|
|---|
| 1169 | AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
|
|---|
| 1170 |
|
|---|
| 1171 | /*
|
|---|
| 1172 | * Use the cached guest ldt address if the descriptor has already been modified (see below)
|
|---|
| 1173 | * (this is necessary due to redundant LDT updates; see todo above at GDT sync)
|
|---|
| 1174 | */
|
|---|
| 1175 | if (MMHyperIsInsideArea(pVM, GCPtrLdt))
|
|---|
| 1176 | GCPtrLdt = pVM->selm.s.GCPtrGuestLdt; /* use the old one */
|
|---|
| 1177 |
|
|---|
| 1178 |
|
|---|
| 1179 | /** @todo Handle only present LDT segments. */
|
|---|
| 1180 | // if (pDesc->Gen.u1Present)
|
|---|
| 1181 | {
|
|---|
| 1182 | /*
|
|---|
| 1183 | * Check if Guest's LDT address/limit is changed.
|
|---|
| 1184 | */
|
|---|
| 1185 | if ( GCPtrLdt != pVM->selm.s.GCPtrGuestLdt
|
|---|
| 1186 | || cbLdt != pVM->selm.s.cbLdtLimit)
|
|---|
| 1187 | {
|
|---|
| 1188 | Log(("SELMR3UpdateFromCPUM: Guest LDT changed to from %RGv:%04x to %RGv:%04x. (GDTR=%016RX64:%04x)\n",
|
|---|
| 1189 | pVM->selm.s.GCPtrGuestLdt, pVM->selm.s.cbLdtLimit, GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
|
|---|
| 1190 |
|
|---|
| 1191 | #ifdef SELM_TRACK_GUEST_LDT_CHANGES
|
|---|
| 1192 | /*
|
|---|
| 1193 | * [Re]Register write virtual handler for guest's GDT.
|
|---|
| 1194 | * In the event of LDT overlapping something, don't install it just assume it's being updated.
|
|---|
| 1195 | */
|
|---|
| 1196 | if (pVM->selm.s.GCPtrGuestLdt != RTRCPTR_MAX)
|
|---|
| 1197 | {
|
|---|
| 1198 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestLdt);
|
|---|
| 1199 | AssertRC(rc);
|
|---|
| 1200 | }
|
|---|
| 1201 | # ifdef DEBUG
|
|---|
| 1202 | if (pDesc->Gen.u1Present)
|
|---|
| 1203 | Log(("LDT selector marked not present!!\n"));
|
|---|
| 1204 | # endif
|
|---|
| 1205 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrLdt, GCPtrLdt + cbLdt /* already inclusive */,
|
|---|
| 1206 | 0, selmR3GuestLDTWriteHandler, "selmRCGuestLDTWriteHandler", 0, "Guest LDT write access handler");
|
|---|
| 1207 | if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
|
|---|
| 1208 | {
|
|---|
| 1209 | /** @todo investigate the various cases where conflicts happen and try avoid them by enh. the instruction emulation. */
|
|---|
| 1210 | pVM->selm.s.GCPtrGuestLdt = RTRCPTR_MAX;
|
|---|
| 1211 | Log(("WARNING: Guest LDT (%RGv:%04x) conflicted with existing access range!! Assumes LDT is begin updated. (GDTR=%016RX64:%04x)\n",
|
|---|
| 1212 | GCPtrLdt, cbLdt, pVM->selm.s.GuestGdtr.pGdt, pVM->selm.s.GuestGdtr.cbGdt));
|
|---|
| 1213 | }
|
|---|
| 1214 | else if (RT_SUCCESS(rc))
|
|---|
| 1215 | pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
|
|---|
| 1216 | else
|
|---|
| 1217 | {
|
|---|
| 1218 | CPUMSetHyperLDTR(pVCpu, 0);
|
|---|
| 1219 | return rc;
|
|---|
| 1220 | }
|
|---|
| 1221 | #else
|
|---|
| 1222 | pVM->selm.s.GCPtrGuestLdt = GCPtrLdt;
|
|---|
| 1223 | #endif
|
|---|
| 1224 | pVM->selm.s.cbLdtLimit = cbLdt;
|
|---|
| 1225 | }
|
|---|
| 1226 | }
|
|---|
| 1227 |
|
|---|
| 1228 | /*
|
|---|
| 1229 | * Calc Shadow LDT base.
|
|---|
| 1230 | */
|
|---|
| 1231 | unsigned off;
|
|---|
| 1232 | pVM->selm.s.offLdtHyper = off = (GCPtrLdt & PAGE_OFFSET_MASK);
|
|---|
| 1233 | RTGCPTR GCPtrShadowLDT = (RTGCPTR)((RTGCUINTPTR)pVM->selm.s.pvLdtRC + off);
|
|---|
| 1234 | PX86DESC pShadowLDT = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
|
|---|
| 1235 |
|
|---|
| 1236 | /*
|
|---|
| 1237 | * Enable the LDT selector in the shadow GDT.
|
|---|
| 1238 | */
|
|---|
| 1239 | pDesc->Gen.u1Present = 1;
|
|---|
| 1240 | pDesc->Gen.u16BaseLow = RT_LOWORD(GCPtrShadowLDT);
|
|---|
| 1241 | pDesc->Gen.u8BaseHigh1 = RT_BYTE3(GCPtrShadowLDT);
|
|---|
| 1242 | pDesc->Gen.u8BaseHigh2 = RT_BYTE4(GCPtrShadowLDT);
|
|---|
| 1243 | pDesc->Gen.u1Available = 0;
|
|---|
| 1244 | pDesc->Gen.u1Long = 0;
|
|---|
| 1245 | if (cbLdt > 0xffff)
|
|---|
| 1246 | {
|
|---|
| 1247 | cbLdt = 0xffff;
|
|---|
| 1248 | pDesc->Gen.u4LimitHigh = 0;
|
|---|
| 1249 | pDesc->Gen.u16LimitLow = pDesc->Gen.u1Granularity ? 0xf : 0xffff;
|
|---|
| 1250 | }
|
|---|
| 1251 |
|
|---|
| 1252 | /*
|
|---|
| 1253 | * Set Hyper LDTR and notify TRPM.
|
|---|
| 1254 | */
|
|---|
| 1255 | CPUMSetHyperLDTR(pVCpu, SelLdt);
|
|---|
| 1256 |
|
|---|
| 1257 | /*
|
|---|
| 1258 | * Loop synchronising the LDT page by page.
|
|---|
| 1259 | */
|
|---|
| 1260 | /** @todo investigate how intel handle various operations on half present cross page entries. */
|
|---|
| 1261 | off = GCPtrLdt & (sizeof(X86DESC) - 1);
|
|---|
| 1262 | AssertMsg(!off, ("LDT is not aligned on entry size! GCPtrLdt=%08x\n", GCPtrLdt));
|
|---|
| 1263 |
|
|---|
| 1264 | /* Note: Do not skip the first selector; unlike the GDT, a zero LDT selector is perfectly valid. */
|
|---|
| 1265 | unsigned cbLeft = cbLdt + 1;
|
|---|
| 1266 | PX86DESC pLDTE = pShadowLDT;
|
|---|
| 1267 | while (cbLeft)
|
|---|
| 1268 | {
|
|---|
| 1269 | /*
|
|---|
| 1270 | * Read a chunk.
|
|---|
| 1271 | */
|
|---|
| 1272 | unsigned cbChunk = PAGE_SIZE - ((RTGCUINTPTR)GCPtrLdt & PAGE_OFFSET_MASK);
|
|---|
| 1273 | if (cbChunk > cbLeft)
|
|---|
| 1274 | cbChunk = cbLeft;
|
|---|
| 1275 | rc = PGMPhysSimpleReadGCPtr(pVCpu, pShadowLDT, GCPtrLdt, cbChunk);
|
|---|
| 1276 | if (RT_SUCCESS(rc))
|
|---|
| 1277 | {
|
|---|
| 1278 | /*
|
|---|
| 1279 | * Mark page
|
|---|
| 1280 | */
|
|---|
| 1281 | rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, X86_PTE_P | X86_PTE_A | X86_PTE_D);
|
|---|
| 1282 | AssertRC(rc);
|
|---|
| 1283 |
|
|---|
| 1284 | /*
|
|---|
| 1285 | * Loop thru the available LDT entries.
|
|---|
| 1286 | * Figure out where to start and end and the potential cross pageness of
|
|---|
| 1287 | * things adds a little complexity. pLDTE is updated there and not in the
|
|---|
| 1288 | * 'next' part of the loop. The pLDTEEnd is inclusive.
|
|---|
| 1289 | */
|
|---|
| 1290 | PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pShadowLDT + cbChunk) - 1;
|
|---|
| 1291 | if (pLDTE + 1 < pShadowLDT)
|
|---|
| 1292 | pLDTE = (PX86DESC)((uintptr_t)pShadowLDT + off);
|
|---|
| 1293 | while (pLDTE <= pLDTEEnd)
|
|---|
| 1294 | {
|
|---|
| 1295 | if (pLDTE->Gen.u1Present)
|
|---|
| 1296 | selmGuestToShadowDesc(pVM, pLDTE);
|
|---|
| 1297 |
|
|---|
| 1298 | /* Next LDT entry. */
|
|---|
| 1299 | pLDTE++;
|
|---|
| 1300 | }
|
|---|
| 1301 | }
|
|---|
| 1302 | else
|
|---|
| 1303 | {
|
|---|
| 1304 | RT_BZERO(pShadowLDT, cbChunk);
|
|---|
| 1305 | AssertMsg(rc == VERR_PAGE_NOT_PRESENT || rc == VERR_PAGE_TABLE_NOT_PRESENT, ("rc=%Rrc\n", rc));
|
|---|
| 1306 | rc = PGMMapSetPage(pVM, GCPtrShadowLDT & PAGE_BASE_GC_MASK, PAGE_SIZE, 0);
|
|---|
| 1307 | AssertRC(rc);
|
|---|
| 1308 | }
|
|---|
| 1309 |
|
|---|
| 1310 | /*
|
|---|
| 1311 | * Advance to the next page.
|
|---|
| 1312 | */
|
|---|
| 1313 | cbLeft -= cbChunk;
|
|---|
| 1314 | GCPtrShadowLDT += cbChunk;
|
|---|
| 1315 | pShadowLDT = (PX86DESC)((char *)pShadowLDT + cbChunk);
|
|---|
| 1316 | GCPtrLdt += cbChunk;
|
|---|
| 1317 | }
|
|---|
| 1318 |
|
|---|
| 1319 | return VINF_SUCCESS;
|
|---|
| 1320 | }
|
|---|
| 1321 |
|
|---|
| 1322 |
|
|---|
| 1323 | /**
|
|---|
| 1324 | * Checks and updates segment selector registers.
|
|---|
| 1325 | *
|
|---|
| 1326 | * @returns VBox strict status code.
|
|---|
| 1327 | * @retval VINF_EM_RESCHEDULE_REM if a stale register was found.
|
|---|
| 1328 | *
|
|---|
| 1329 | * @param pVM The VM handle.
|
|---|
| 1330 | * @param pVCpu The current virtual CPU.
|
|---|
| 1331 | */
|
|---|
| 1332 | static VBOXSTRICTRC selmR3UpdateSegmentRegisters(PVM pVM, PVMCPU pVCpu)
|
|---|
| 1333 | {
|
|---|
| 1334 | Assert(CPUMIsGuestInProtectedMode(pVCpu));
|
|---|
| 1335 |
|
|---|
| 1336 | /*
|
|---|
| 1337 | * No stale selectors in V8086 mode.
|
|---|
| 1338 | */
|
|---|
| 1339 | PCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu);
|
|---|
| 1340 | if (pCtx->eflags.Bits.u1VM)
|
|---|
| 1341 | return VINF_SUCCESS;
|
|---|
| 1342 |
|
|---|
| 1343 | /*
|
|---|
| 1344 | * Check for stale selectors and load hidden register bits where they
|
|---|
| 1345 | * are missing.
|
|---|
| 1346 | */
|
|---|
| 1347 | uint32_t uCpl = CPUMGetGuestCPL(pVCpu);
|
|---|
| 1348 | VBOXSTRICTRC rcStrict = VINF_SUCCESS;
|
|---|
| 1349 | PCPUMSELREG paSReg = CPUMCTX_FIRST_SREG(pCtx);
|
|---|
| 1350 | for (uint32_t iSReg = 0; iSReg < X86_SREG_COUNT; iSReg++)
|
|---|
| 1351 | {
|
|---|
| 1352 | RTSEL const Sel = paSReg[iSReg].Sel;
|
|---|
| 1353 | if (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 1354 | {
|
|---|
| 1355 | /* Get the shadow descriptor entry corresponding to this. */
|
|---|
| 1356 | static X86DESC const s_NotPresentDesc = { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } };
|
|---|
| 1357 | PCX86DESC pDesc;
|
|---|
| 1358 | if (!(Sel & X86_SEL_LDT))
|
|---|
| 1359 | {
|
|---|
| 1360 | if ((Sel | (sizeof(*pDesc) - 1)) <= pCtx->gdtr.cbGdt)
|
|---|
| 1361 | pDesc = &pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
|
|---|
| 1362 | else
|
|---|
| 1363 | pDesc = &s_NotPresentDesc;
|
|---|
| 1364 | }
|
|---|
| 1365 | else
|
|---|
| 1366 | {
|
|---|
| 1367 | if ((Sel | (sizeof(*pDesc) - 1)) <= pVM->selm.s.cbLdtLimit)
|
|---|
| 1368 | pDesc = &((PCX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper))[Sel >> X86_SEL_SHIFT];
|
|---|
| 1369 | else
|
|---|
| 1370 | pDesc = &s_NotPresentDesc;
|
|---|
| 1371 | }
|
|---|
| 1372 |
|
|---|
| 1373 | /* Check the segment register. */
|
|---|
| 1374 | if (CPUMSELREG_ARE_HIDDEN_PARTS_VALID(pVCpu, &paSReg[iSReg]))
|
|---|
| 1375 | {
|
|---|
| 1376 | if (!(paSReg[iSReg].fFlags & CPUMSELREG_FLAGS_STALE))
|
|---|
| 1377 | {
|
|---|
| 1378 | /* Did it go stale? */
|
|---|
| 1379 | if (selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
|
|---|
| 1380 | {
|
|---|
| 1381 | Log2(("SELM: Detected stale %s=%#x (was valid)\n", g_aszSRegNms[iSReg], Sel));
|
|---|
| 1382 | STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
|
|---|
| 1383 | paSReg[iSReg].fFlags |= CPUMSELREG_FLAGS_STALE;
|
|---|
| 1384 | rcStrict = VINF_EM_RESCHEDULE_REM;
|
|---|
| 1385 | }
|
|---|
| 1386 | }
|
|---|
| 1387 | else
|
|---|
| 1388 | {
|
|---|
| 1389 | /* Did it stop being stale? I.e. did the guest change it things
|
|---|
| 1390 | back to the way they were? */
|
|---|
| 1391 | if (!selmIsSRegStale32(&paSReg[iSReg], pDesc, iSReg))
|
|---|
| 1392 | {
|
|---|
| 1393 | STAM_REL_COUNTER_INC(&pVM->selm.s.StatStaleToUnstaleSReg);
|
|---|
| 1394 | paSReg[iSReg].fFlags &= CPUMSELREG_FLAGS_STALE;
|
|---|
| 1395 | }
|
|---|
| 1396 | else
|
|---|
| 1397 | {
|
|---|
| 1398 | Log2(("SELM: Already stale %s=%#x\n", g_aszSRegNms[iSReg], Sel));
|
|---|
| 1399 | STAM_REL_COUNTER_INC(&pVM->selm.s.aStatAlreadyStaleSReg[iSReg]);
|
|---|
| 1400 | rcStrict = VINF_EM_RESCHEDULE_REM;
|
|---|
| 1401 | }
|
|---|
| 1402 | }
|
|---|
| 1403 | }
|
|---|
| 1404 | /* Load the hidden registers if it's a valid descriptor for the
|
|---|
| 1405 | current segment register. */
|
|---|
| 1406 | else if (selmIsShwDescGoodForSReg(&paSReg[iSReg], pDesc, iSReg, uCpl))
|
|---|
| 1407 | {
|
|---|
| 1408 | selmLoadHiddenSRegFromShadowDesc(&paSReg[iSReg], pDesc);
|
|---|
| 1409 | STAM_COUNTER_INC(&pVM->selm.s.aStatUpdatedSReg[iSReg]);
|
|---|
| 1410 | }
|
|---|
| 1411 | /* It's stale. */
|
|---|
| 1412 | else
|
|---|
| 1413 | {
|
|---|
| 1414 | Log2(("SELM: Detected stale %s=%#x (wasn't valid)\n", g_aszSRegNms[iSReg], Sel));
|
|---|
| 1415 | STAM_REL_COUNTER_INC(&pVM->selm.s.aStatDetectedStaleSReg[iSReg]);
|
|---|
| 1416 | paSReg[iSReg].fFlags = CPUMSELREG_FLAGS_STALE;
|
|---|
| 1417 | rcStrict = VINF_EM_RESCHEDULE_REM;
|
|---|
| 1418 | }
|
|---|
| 1419 | }
|
|---|
| 1420 | /* else: 0 selector, ignore. */
|
|---|
| 1421 | }
|
|---|
| 1422 |
|
|---|
| 1423 | return rcStrict;
|
|---|
| 1424 | }
|
|---|
| 1425 |
|
|---|
| 1426 |
|
|---|
| 1427 | /**
|
|---|
| 1428 | * Updates the Guest GDT & LDT virtualization based on current CPU state.
|
|---|
| 1429 | *
|
|---|
| 1430 | * @returns VBox status code.
|
|---|
| 1431 | * @param pVM Pointer to the VM.
|
|---|
| 1432 | * @param pVCpu Pointer to the VMCPU.
|
|---|
| 1433 | */
|
|---|
| 1434 | VMMR3DECL(VBOXSTRICTRC) SELMR3UpdateFromCPUM(PVM pVM, PVMCPU pVCpu)
|
|---|
| 1435 | {
|
|---|
| 1436 | if (pVM->selm.s.fDisableMonitoring)
|
|---|
| 1437 | {
|
|---|
| 1438 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 1439 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 1440 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 1441 | return VINF_SUCCESS;
|
|---|
| 1442 | }
|
|---|
| 1443 |
|
|---|
| 1444 | STAM_PROFILE_START(&pVM->selm.s.StatUpdateFromCPUM, a);
|
|---|
| 1445 |
|
|---|
| 1446 | /*
|
|---|
| 1447 | * GDT sync
|
|---|
| 1448 | */
|
|---|
| 1449 | int rc;
|
|---|
| 1450 | if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_GDT))
|
|---|
| 1451 | {
|
|---|
| 1452 | rc = selmR3UpdateShadowGdt(pVM, pVCpu);
|
|---|
| 1453 | if (RT_FAILURE(rc))
|
|---|
| 1454 | return rc; /* We're toast, so forget the profiling. */
|
|---|
| 1455 | AssertRCSuccess(rc);
|
|---|
| 1456 | }
|
|---|
| 1457 |
|
|---|
| 1458 | /*
|
|---|
| 1459 | * TSS sync
|
|---|
| 1460 | */
|
|---|
| 1461 | if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
|
|---|
| 1462 | {
|
|---|
| 1463 | rc = SELMR3SyncTSS(pVM, pVCpu);
|
|---|
| 1464 | if (RT_FAILURE(rc))
|
|---|
| 1465 | return rc;
|
|---|
| 1466 | AssertRCSuccess(rc);
|
|---|
| 1467 | }
|
|---|
| 1468 |
|
|---|
| 1469 | /*
|
|---|
| 1470 | * LDT sync
|
|---|
| 1471 | */
|
|---|
| 1472 | if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_LDT))
|
|---|
| 1473 | {
|
|---|
| 1474 | rc = selmR3UpdateShadowLdt(pVM, pVCpu);
|
|---|
| 1475 | if (RT_FAILURE(rc))
|
|---|
| 1476 | return rc;
|
|---|
| 1477 | AssertRCSuccess(rc);
|
|---|
| 1478 | }
|
|---|
| 1479 |
|
|---|
| 1480 | /*
|
|---|
| 1481 | * Check selector registers.
|
|---|
| 1482 | */
|
|---|
| 1483 | VBOXSTRICTRC rcStrict = selmR3UpdateSegmentRegisters(pVM, pVCpu);
|
|---|
| 1484 |
|
|---|
| 1485 | STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
|
|---|
| 1486 | return rcStrict;
|
|---|
| 1487 | }
|
|---|
| 1488 |
|
|---|
| 1489 | #endif /*VBOX_WITH_RAW_MODE*/
|
|---|
| 1490 |
|
|---|
| 1491 | #ifdef SELM_TRACK_GUEST_GDT_CHANGES
|
|---|
| 1492 | /**
|
|---|
| 1493 | * \#PF Handler callback for virtual access handler ranges.
|
|---|
| 1494 | *
|
|---|
| 1495 | * Important to realize that a physical page in a range can have aliases, and
|
|---|
| 1496 | * for ALL and WRITE handlers these will also trigger.
|
|---|
| 1497 | *
|
|---|
| 1498 | * @returns VINF_SUCCESS if the handler have carried out the operation.
|
|---|
| 1499 | * @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
|
|---|
| 1500 | * @param pVM Pointer to the VM.
|
|---|
| 1501 | * @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
|
|---|
| 1502 | * @param pvPtr The HC mapping of that address.
|
|---|
| 1503 | * @param pvBuf What the guest is reading/writing.
|
|---|
| 1504 | * @param cbBuf How much it's reading/writing.
|
|---|
| 1505 | * @param enmAccessType The access type.
|
|---|
| 1506 | * @param pvUser User argument.
|
|---|
| 1507 | */
|
|---|
| 1508 | static DECLCALLBACK(int) selmR3GuestGDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf,
|
|---|
| 1509 | PGMACCESSTYPE enmAccessType, void *pvUser)
|
|---|
| 1510 | {
|
|---|
| 1511 | Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
|
|---|
| 1512 | Log(("selmR3GuestGDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf)); NOREF(GCPtr); NOREF(cbBuf);
|
|---|
| 1513 | NOREF(pvPtr); NOREF(pvBuf); NOREF(pvUser);
|
|---|
| 1514 |
|
|---|
| 1515 | VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_GDT);
|
|---|
| 1516 | return VINF_PGM_HANDLER_DO_DEFAULT;
|
|---|
| 1517 | }
|
|---|
| 1518 | #endif
|
|---|
| 1519 |
|
|---|
| 1520 | #ifdef SELM_TRACK_GUEST_LDT_CHANGES
|
|---|
| 1521 | /**
|
|---|
| 1522 | * \#PF Handler callback for virtual access handler ranges.
|
|---|
| 1523 | *
|
|---|
| 1524 | * Important to realize that a physical page in a range can have aliases, and
|
|---|
| 1525 | * for ALL and WRITE handlers these will also trigger.
|
|---|
| 1526 | *
|
|---|
| 1527 | * @returns VINF_SUCCESS if the handler have carried out the operation.
|
|---|
| 1528 | * @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
|
|---|
| 1529 | * @param pVM Pointer to the VM.
|
|---|
| 1530 | * @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
|
|---|
| 1531 | * @param pvPtr The HC mapping of that address.
|
|---|
| 1532 | * @param pvBuf What the guest is reading/writing.
|
|---|
| 1533 | * @param cbBuf How much it's reading/writing.
|
|---|
| 1534 | * @param enmAccessType The access type.
|
|---|
| 1535 | * @param pvUser User argument.
|
|---|
| 1536 | */
|
|---|
| 1537 | static DECLCALLBACK(int) selmR3GuestLDTWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf,
|
|---|
| 1538 | PGMACCESSTYPE enmAccessType, void *pvUser)
|
|---|
| 1539 | {
|
|---|
| 1540 | Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
|
|---|
| 1541 | Log(("selmR3GuestLDTWriteHandler: write to %RGv size %d\n", GCPtr, cbBuf)); NOREF(GCPtr); NOREF(cbBuf);
|
|---|
| 1542 | NOREF(pvPtr); NOREF(pvBuf); NOREF(pvUser);
|
|---|
| 1543 |
|
|---|
| 1544 | VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_LDT);
|
|---|
| 1545 | return VINF_PGM_HANDLER_DO_DEFAULT;
|
|---|
| 1546 | }
|
|---|
| 1547 | #endif
|
|---|
| 1548 |
|
|---|
| 1549 |
|
|---|
| 1550 | #ifdef SELM_TRACK_GUEST_TSS_CHANGES
|
|---|
| 1551 | /**
|
|---|
| 1552 | * \#PF Handler callback for virtual access handler ranges.
|
|---|
| 1553 | *
|
|---|
| 1554 | * Important to realize that a physical page in a range can have aliases, and
|
|---|
| 1555 | * for ALL and WRITE handlers these will also trigger.
|
|---|
| 1556 | *
|
|---|
| 1557 | * @returns VINF_SUCCESS if the handler have carried out the operation.
|
|---|
| 1558 | * @returns VINF_PGM_HANDLER_DO_DEFAULT if the caller should carry out the access operation.
|
|---|
| 1559 | * @param pVM Pointer to the VM.
|
|---|
| 1560 | * @param GCPtr The virtual address the guest is writing to. (not correct if it's an alias!)
|
|---|
| 1561 | * @param pvPtr The HC mapping of that address.
|
|---|
| 1562 | * @param pvBuf What the guest is reading/writing.
|
|---|
| 1563 | * @param cbBuf How much it's reading/writing.
|
|---|
| 1564 | * @param enmAccessType The access type.
|
|---|
| 1565 | * @param pvUser User argument.
|
|---|
| 1566 | */
|
|---|
| 1567 | static DECLCALLBACK(int) selmR3GuestTSSWriteHandler(PVM pVM, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf,
|
|---|
| 1568 | PGMACCESSTYPE enmAccessType, void *pvUser)
|
|---|
| 1569 | {
|
|---|
| 1570 | Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
|
|---|
| 1571 | Log(("selmR3GuestTSSWriteHandler: write %.*Rhxs to %RGv size %d\n", RT_MIN(8, cbBuf), pvBuf, GCPtr, cbBuf));
|
|---|
| 1572 | NOREF(pvBuf); NOREF(GCPtr); NOREF(cbBuf); NOREF(pvUser);NOREF(pvPtr);
|
|---|
| 1573 |
|
|---|
| 1574 | /** @todo This can be optimized by checking for the ESP0 offset and tracking TR
|
|---|
| 1575 | * reloads in REM (setting VM_FF_SELM_SYNC_TSS if TR is reloaded). We
|
|---|
| 1576 | * should probably also deregister the virtual handler if TR.base/size
|
|---|
| 1577 | * changes while we're in REM. */
|
|---|
| 1578 |
|
|---|
| 1579 | VMCPU_FF_SET(VMMGetCpu(pVM), VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 1580 | return VINF_PGM_HANDLER_DO_DEFAULT;
|
|---|
| 1581 | }
|
|---|
| 1582 | #endif
|
|---|
| 1583 |
|
|---|
| 1584 | #ifdef VBOX_WITH_RAW_MODE
|
|---|
| 1585 |
|
|---|
| 1586 | /**
|
|---|
| 1587 | * Synchronize the shadowed fields in the TSS.
|
|---|
| 1588 | *
|
|---|
| 1589 | * At present we're shadowing the ring-0 stack selector & pointer, and the
|
|---|
| 1590 | * interrupt redirection bitmap (if present). We take the lazy approach wrt to
|
|---|
| 1591 | * REM and this function is called both if REM made any changes to the TSS or
|
|---|
| 1592 | * loaded TR.
|
|---|
| 1593 | *
|
|---|
| 1594 | * @returns VBox status code.
|
|---|
| 1595 | * @param pVM Pointer to the VM.
|
|---|
| 1596 | * @param pVCpu Pointer to the VMCPU.
|
|---|
| 1597 | */
|
|---|
| 1598 | VMMR3DECL(int) SELMR3SyncTSS(PVM pVM, PVMCPU pVCpu)
|
|---|
| 1599 | {
|
|---|
| 1600 | int rc;
|
|---|
| 1601 |
|
|---|
| 1602 | if (pVM->selm.s.fDisableMonitoring)
|
|---|
| 1603 | {
|
|---|
| 1604 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 1605 | return VINF_SUCCESS;
|
|---|
| 1606 | }
|
|---|
| 1607 |
|
|---|
| 1608 | STAM_PROFILE_START(&pVM->selm.s.StatTSSSync, a);
|
|---|
| 1609 | Assert(VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS));
|
|---|
| 1610 |
|
|---|
| 1611 | /*
|
|---|
| 1612 | * Get TR and extract and store the basic info.
|
|---|
| 1613 | *
|
|---|
| 1614 | * Note! The TSS limit is not checked by the LTR code, so we
|
|---|
| 1615 | * have to be a bit careful with it. We make sure cbTss
|
|---|
| 1616 | * won't be zero if TR is valid and if it's NULL we'll
|
|---|
| 1617 | * make sure cbTss is 0.
|
|---|
| 1618 | */
|
|---|
| 1619 | /** @todo use the hidden bits, not shadow GDT. */
|
|---|
| 1620 | CPUMSELREGHID trHid;
|
|---|
| 1621 | RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
|
|---|
| 1622 | RTGCPTR GCPtrTss = trHid.u64Base;
|
|---|
| 1623 | uint32_t cbTss = trHid.u32Limit;
|
|---|
| 1624 | Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
|
|---|
| 1625 | || (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
|
|---|
| 1626 | || (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
|
|---|
| 1627 | if (SelTss & X86_SEL_MASK_OFF_RPL)
|
|---|
| 1628 | {
|
|---|
| 1629 | Assert(!(SelTss & X86_SEL_LDT));
|
|---|
| 1630 | Assert(trHid.Attr.n.u1DescType == 0);
|
|---|
| 1631 | Assert( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
|
|---|
| 1632 | || trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY);
|
|---|
| 1633 | if (!++cbTss)
|
|---|
| 1634 | cbTss = UINT32_MAX;
|
|---|
| 1635 | }
|
|---|
| 1636 | else
|
|---|
| 1637 | {
|
|---|
| 1638 | Assert( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
|
|---|
| 1639 | || (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
|
|---|
| 1640 | cbTss = 0; /* the reset case. */
|
|---|
| 1641 | }
|
|---|
| 1642 | pVM->selm.s.cbGuestTss = cbTss;
|
|---|
| 1643 | pVM->selm.s.fGuestTss32Bit = trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
|
|---|
| 1644 | || trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY;
|
|---|
| 1645 |
|
|---|
| 1646 | /*
|
|---|
| 1647 | * Figure out the size of what need to monitor.
|
|---|
| 1648 | */
|
|---|
| 1649 | /* We're not interested in any 16-bit TSSes. */
|
|---|
| 1650 | uint32_t cbMonitoredTss = cbTss;
|
|---|
| 1651 | if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
|
|---|
| 1652 | && trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
|
|---|
| 1653 | cbMonitoredTss = 0;
|
|---|
| 1654 |
|
|---|
| 1655 | pVM->selm.s.offGuestIoBitmap = 0;
|
|---|
| 1656 | bool fNoRing1Stack = true;
|
|---|
| 1657 | if (cbMonitoredTss)
|
|---|
| 1658 | {
|
|---|
| 1659 | /*
|
|---|
| 1660 | * 32-bit TSS. What we're really keen on is the SS0 and ESP0 fields.
|
|---|
| 1661 | * If VME is enabled we also want to keep an eye on the interrupt
|
|---|
| 1662 | * redirection bitmap.
|
|---|
| 1663 | */
|
|---|
| 1664 | VBOXTSS Tss;
|
|---|
| 1665 | uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
|
|---|
| 1666 | rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
|
|---|
| 1667 | if ( !(cr4 & X86_CR4_VME)
|
|---|
| 1668 | || ( RT_SUCCESS(rc)
|
|---|
| 1669 | && Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
|
|---|
| 1670 | && Tss.offIoBitmap > cbTss) /* beyond the end */ /** @todo not sure how the partial case is handled; probably not allowed. */
|
|---|
| 1671 | )
|
|---|
| 1672 | /* No interrupt redirection bitmap, just ESP0 and SS0. */
|
|---|
| 1673 | cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
|
|---|
| 1674 | else if (RT_SUCCESS(rc))
|
|---|
| 1675 | {
|
|---|
| 1676 | /*
|
|---|
| 1677 | * Everything up to and including the interrupt redirection bitmap. Unfortunately
|
|---|
| 1678 | * this can be quite a large chunk. We use to skip it earlier and just hope it
|
|---|
| 1679 | * was kind of static...
|
|---|
| 1680 | *
|
|---|
| 1681 | * Update the virtual interrupt redirection bitmap while we're here.
|
|---|
| 1682 | * (It is located in the 32 bytes before TR:offIoBitmap.)
|
|---|
| 1683 | */
|
|---|
| 1684 | cbMonitoredTss = Tss.offIoBitmap;
|
|---|
| 1685 | pVM->selm.s.offGuestIoBitmap = Tss.offIoBitmap;
|
|---|
| 1686 |
|
|---|
| 1687 | uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
|
|---|
| 1688 | rc = PGMPhysSimpleReadGCPtr(pVCpu, &pVM->selm.s.Tss.IntRedirBitmap,
|
|---|
| 1689 | GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
|
|---|
| 1690 | AssertRC(rc);
|
|---|
| 1691 | /** @todo memset the bitmap on failure? */
|
|---|
| 1692 | Log2(("Redirection bitmap:\n"));
|
|---|
| 1693 | Log2(("%.*Rhxd\n", sizeof(Tss.IntRedirBitmap), &pVM->selm.s.Tss.IntRedirBitmap));
|
|---|
| 1694 | }
|
|---|
| 1695 | else
|
|---|
| 1696 | {
|
|---|
| 1697 | cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
|
|---|
| 1698 | pVM->selm.s.offGuestIoBitmap = 0;
|
|---|
| 1699 | /** @todo memset the bitmap? */
|
|---|
| 1700 | }
|
|---|
| 1701 |
|
|---|
| 1702 | /*
|
|---|
| 1703 | * Update the ring 0 stack selector and base address.
|
|---|
| 1704 | */
|
|---|
| 1705 | if (RT_SUCCESS(rc))
|
|---|
| 1706 | {
|
|---|
| 1707 | # ifdef LOG_ENABLED
|
|---|
| 1708 | if (LogIsEnabled())
|
|---|
| 1709 | {
|
|---|
| 1710 | uint32_t ssr0, espr0;
|
|---|
| 1711 | SELMGetRing1Stack(pVM, &ssr0, &espr0);
|
|---|
| 1712 | if ((ssr0 & ~1) != Tss.ss0 || espr0 != Tss.esp0)
|
|---|
| 1713 | {
|
|---|
| 1714 | RTGCPHYS GCPhys = NIL_RTGCPHYS;
|
|---|
| 1715 | rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
|
|---|
| 1716 | Log(("SELMR3SyncTSS: Updating TSS ring 0 stack to %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
|
|---|
| 1717 | Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
|
|---|
| 1718 | AssertMsg(ssr0 != Tss.ss0,
|
|---|
| 1719 | ("ring-1 leak into TSS.SS0! %04X:%08X from %04X:%08X; TSS Phys=%RGp)\n",
|
|---|
| 1720 | Tss.ss0, Tss.esp0, (ssr0 & ~1), espr0, GCPhys));
|
|---|
| 1721 | }
|
|---|
| 1722 | Log(("offIoBitmap=%#x\n", Tss.offIoBitmap));
|
|---|
| 1723 | }
|
|---|
| 1724 | # endif /* LOG_ENABLED */
|
|---|
| 1725 | AssertMsg(!(Tss.ss0 & 3), ("ring-1 leak into TSS.SS0? %04X:%08X\n", Tss.ss0, Tss.esp0));
|
|---|
| 1726 |
|
|---|
| 1727 | /* Update our TSS structure for the guest's ring 1 stack */
|
|---|
| 1728 | selmSetRing1Stack(pVM, Tss.ss0 | 1, Tss.esp0);
|
|---|
| 1729 | pVM->selm.s.fSyncTSSRing0Stack = fNoRing1Stack = false;
|
|---|
| 1730 |
|
|---|
| 1731 | # ifdef VBOX_WITH_RAW_RING1
|
|---|
| 1732 | /* Update our TSS structure for the guest's ring 2 stack */
|
|---|
| 1733 | if (EMIsRawRing1Enabled(pVM))
|
|---|
| 1734 | {
|
|---|
| 1735 | if ( (pVM->selm.s.Tss.ss2 != ((Tss.ss1 & ~2) | 1))
|
|---|
| 1736 | || pVM->selm.s.Tss.esp2 != Tss.esp1)
|
|---|
| 1737 | Log(("SELMR3SyncTSS: Updating TSS ring 1 stack to %04X:%08X from %04X:%08X\n", Tss.ss1, Tss.esp1, (pVM->selm.s.Tss.ss2 & ~2) | 1, pVM->selm.s.Tss.esp2));
|
|---|
| 1738 | selmSetRing2Stack(pVM, (Tss.ss1 & ~1) | 2, Tss.esp1);
|
|---|
| 1739 | }
|
|---|
| 1740 | # endif
|
|---|
| 1741 | }
|
|---|
| 1742 | }
|
|---|
| 1743 |
|
|---|
| 1744 | /*
|
|---|
| 1745 | * Flush the ring-1 stack and the direct syscall dispatching if we
|
|---|
| 1746 | * cannot obtain SS0:ESP0.
|
|---|
| 1747 | */
|
|---|
| 1748 | if (fNoRing1Stack)
|
|---|
| 1749 | {
|
|---|
| 1750 | selmSetRing1Stack(pVM, 0 /* invalid SS */, 0);
|
|---|
| 1751 | pVM->selm.s.fSyncTSSRing0Stack = cbMonitoredTss != 0;
|
|---|
| 1752 |
|
|---|
| 1753 | /** @todo handle these dependencies better! */
|
|---|
| 1754 | TRPMR3SetGuestTrapHandler(pVM, 0x2E, TRPM_INVALID_HANDLER);
|
|---|
| 1755 | TRPMR3SetGuestTrapHandler(pVM, 0x80, TRPM_INVALID_HANDLER);
|
|---|
| 1756 | }
|
|---|
| 1757 |
|
|---|
| 1758 | /*
|
|---|
| 1759 | * Check for monitor changes and apply them.
|
|---|
| 1760 | */
|
|---|
| 1761 | if ( GCPtrTss != pVM->selm.s.GCPtrGuestTss
|
|---|
| 1762 | || cbMonitoredTss != pVM->selm.s.cbMonitoredGuestTss)
|
|---|
| 1763 | {
|
|---|
| 1764 | Log(("SELMR3SyncTSS: Guest's TSS is changed to pTss=%RGv cbMonitoredTss=%08X cbGuestTss=%#08x\n",
|
|---|
| 1765 | GCPtrTss, cbMonitoredTss, pVM->selm.s.cbGuestTss));
|
|---|
| 1766 |
|
|---|
| 1767 | /* Release the old range first. */
|
|---|
| 1768 | if (pVM->selm.s.GCPtrGuestTss != RTRCPTR_MAX)
|
|---|
| 1769 | {
|
|---|
| 1770 | rc = PGMHandlerVirtualDeregister(pVM, pVM->selm.s.GCPtrGuestTss);
|
|---|
| 1771 | AssertRC(rc);
|
|---|
| 1772 | }
|
|---|
| 1773 |
|
|---|
| 1774 | /* Register the write handler if TS != 0. */
|
|---|
| 1775 | if (cbMonitoredTss != 0)
|
|---|
| 1776 | {
|
|---|
| 1777 | # ifdef SELM_TRACK_GUEST_TSS_CHANGES
|
|---|
| 1778 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
|
|---|
| 1779 | 0, selmR3GuestTSSWriteHandler,
|
|---|
| 1780 | "selmRCGuestTSSWriteHandler", 0, "Guest TSS write access handler");
|
|---|
| 1781 | if (RT_FAILURE(rc))
|
|---|
| 1782 | {
|
|---|
| 1783 | # ifdef VBOX_WITH_RAW_RING1
|
|---|
| 1784 | /** @todo !HACK ALERT!
|
|---|
| 1785 | * Some guest OSes (QNX) share code and the TSS on the same page;
|
|---|
| 1786 | * PGMR3HandlerVirtualRegister doesn't support more than one
|
|---|
| 1787 | * handler, so we kick out the PATM handler as this one is more
|
|---|
| 1788 | * important. Fix this properly in PGMR3HandlerVirtualRegister?
|
|---|
| 1789 | */
|
|---|
| 1790 | if (rc == VERR_PGM_HANDLER_VIRTUAL_CONFLICT)
|
|---|
| 1791 | {
|
|---|
| 1792 | LogRel(("SELMR3SyncTSS: Virtual handler conflict %RGv -> kick out PATM handler for the higher priority TSS page monitor\n", GCPtrTss));
|
|---|
| 1793 | rc = PGMHandlerVirtualDeregister(pVM, GCPtrTss & PAGE_BASE_GC_MASK);
|
|---|
| 1794 | AssertRC(rc);
|
|---|
| 1795 |
|
|---|
| 1796 | rc = PGMR3HandlerVirtualRegister(pVM, PGMVIRTHANDLERTYPE_WRITE, GCPtrTss, GCPtrTss + cbMonitoredTss - 1,
|
|---|
| 1797 | 0, selmR3GuestTSSWriteHandler,
|
|---|
| 1798 | "selmRCGuestTSSWriteHandler", 0, "Guest TSS write access handler");
|
|---|
| 1799 | if (RT_FAILURE(rc))
|
|---|
| 1800 | {
|
|---|
| 1801 | STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
|
|---|
| 1802 | return rc;
|
|---|
| 1803 | }
|
|---|
| 1804 | }
|
|---|
| 1805 | # else
|
|---|
| 1806 | STAM_PROFILE_STOP(&pVM->selm.s.StatUpdateFromCPUM, a);
|
|---|
| 1807 | return rc;
|
|---|
| 1808 | # endif
|
|---|
| 1809 | }
|
|---|
| 1810 | # endif /* SELM_TRACK_GUEST_TSS_CHANGES */
|
|---|
| 1811 |
|
|---|
| 1812 | /* Update saved Guest TSS info. */
|
|---|
| 1813 | pVM->selm.s.GCPtrGuestTss = GCPtrTss;
|
|---|
| 1814 | pVM->selm.s.cbMonitoredGuestTss = cbMonitoredTss;
|
|---|
| 1815 | pVM->selm.s.GCSelTss = SelTss;
|
|---|
| 1816 | }
|
|---|
| 1817 | else
|
|---|
| 1818 | {
|
|---|
| 1819 | pVM->selm.s.GCPtrGuestTss = RTRCPTR_MAX;
|
|---|
| 1820 | pVM->selm.s.cbMonitoredGuestTss = 0;
|
|---|
| 1821 | pVM->selm.s.GCSelTss = 0;
|
|---|
| 1822 | }
|
|---|
| 1823 | }
|
|---|
| 1824 |
|
|---|
| 1825 | VMCPU_FF_CLEAR(pVCpu, VMCPU_FF_SELM_SYNC_TSS);
|
|---|
| 1826 |
|
|---|
| 1827 | STAM_PROFILE_STOP(&pVM->selm.s.StatTSSSync, a);
|
|---|
| 1828 | return VINF_SUCCESS;
|
|---|
| 1829 | }
|
|---|
| 1830 |
|
|---|
| 1831 |
|
|---|
| 1832 | /**
|
|---|
| 1833 | * Compares the Guest GDT and LDT with the shadow tables.
|
|---|
| 1834 | * This is a VBOX_STRICT only function.
|
|---|
| 1835 | *
|
|---|
| 1836 | * @returns VBox status code.
|
|---|
| 1837 | * @param pVM Pointer to the VM.
|
|---|
| 1838 | */
|
|---|
| 1839 | VMMR3DECL(int) SELMR3DebugCheck(PVM pVM)
|
|---|
| 1840 | {
|
|---|
| 1841 | #ifdef VBOX_STRICT
|
|---|
| 1842 | PVMCPU pVCpu = VMMGetCpu(pVM);
|
|---|
| 1843 |
|
|---|
| 1844 | /*
|
|---|
| 1845 | * Get GDTR and check for conflict.
|
|---|
| 1846 | */
|
|---|
| 1847 | VBOXGDTR GDTR;
|
|---|
| 1848 | CPUMGetGuestGDTR(pVCpu, &GDTR);
|
|---|
| 1849 | if (GDTR.cbGdt == 0)
|
|---|
| 1850 | return VINF_SUCCESS;
|
|---|
| 1851 |
|
|---|
| 1852 | if (GDTR.cbGdt >= (unsigned)(pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
|
|---|
| 1853 | Log(("SELMR3DebugCheck: guest GDT size forced us to look for unused selectors.\n"));
|
|---|
| 1854 |
|
|---|
| 1855 | if (GDTR.cbGdt != pVM->selm.s.GuestGdtr.cbGdt)
|
|---|
| 1856 | Log(("SELMR3DebugCheck: limits have changed! new=%d old=%d\n", GDTR.cbGdt, pVM->selm.s.GuestGdtr.cbGdt));
|
|---|
| 1857 |
|
|---|
| 1858 | /*
|
|---|
| 1859 | * Loop thru the GDT checking each entry.
|
|---|
| 1860 | */
|
|---|
| 1861 | RTGCPTR GCPtrGDTEGuest = GDTR.pGdt;
|
|---|
| 1862 | PX86DESC pGDTE = pVM->selm.s.paGdtR3;
|
|---|
| 1863 | PX86DESC pGDTEEnd = (PX86DESC)((uintptr_t)pGDTE + GDTR.cbGdt);
|
|---|
| 1864 | while (pGDTE < pGDTEEnd)
|
|---|
| 1865 | {
|
|---|
| 1866 | X86DESC GDTEGuest;
|
|---|
| 1867 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTEGuest, GCPtrGDTEGuest, sizeof(GDTEGuest));
|
|---|
| 1868 | if (RT_SUCCESS(rc))
|
|---|
| 1869 | {
|
|---|
| 1870 | if (pGDTE->Gen.u1DescType || pGDTE->Gen.u4Type != X86_SEL_TYPE_SYS_LDT)
|
|---|
| 1871 | {
|
|---|
| 1872 | if ( pGDTE->Gen.u16LimitLow != GDTEGuest.Gen.u16LimitLow
|
|---|
| 1873 | || pGDTE->Gen.u4LimitHigh != GDTEGuest.Gen.u4LimitHigh
|
|---|
| 1874 | || pGDTE->Gen.u16BaseLow != GDTEGuest.Gen.u16BaseLow
|
|---|
| 1875 | || pGDTE->Gen.u8BaseHigh1 != GDTEGuest.Gen.u8BaseHigh1
|
|---|
| 1876 | || pGDTE->Gen.u8BaseHigh2 != GDTEGuest.Gen.u8BaseHigh2
|
|---|
| 1877 | || pGDTE->Gen.u1DefBig != GDTEGuest.Gen.u1DefBig
|
|---|
| 1878 | || pGDTE->Gen.u1DescType != GDTEGuest.Gen.u1DescType)
|
|---|
| 1879 | {
|
|---|
| 1880 | unsigned iGDT = pGDTE - pVM->selm.s.paGdtR3;
|
|---|
| 1881 | SELMR3DumpDescriptor(*pGDTE, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, shadow");
|
|---|
| 1882 | SELMR3DumpDescriptor(GDTEGuest, iGDT << 3, "SELMR3DebugCheck: GDT mismatch, guest");
|
|---|
| 1883 | }
|
|---|
| 1884 | }
|
|---|
| 1885 | }
|
|---|
| 1886 |
|
|---|
| 1887 | /* Advance to the next descriptor. */
|
|---|
| 1888 | GCPtrGDTEGuest += sizeof(X86DESC);
|
|---|
| 1889 | pGDTE++;
|
|---|
| 1890 | }
|
|---|
| 1891 |
|
|---|
| 1892 |
|
|---|
| 1893 | /*
|
|---|
| 1894 | * LDT?
|
|---|
| 1895 | */
|
|---|
| 1896 | RTSEL SelLdt = CPUMGetGuestLDTR(pVCpu);
|
|---|
| 1897 | if ((SelLdt & X86_SEL_MASK_OFF_RPL) == 0)
|
|---|
| 1898 | return VINF_SUCCESS;
|
|---|
| 1899 | Assert(!(SelLdt & X86_SEL_LDT));
|
|---|
| 1900 | if (SelLdt > GDTR.cbGdt)
|
|---|
| 1901 | {
|
|---|
| 1902 | Log(("SELMR3DebugCheck: ldt is out of bound SelLdt=%#x\n", SelLdt));
|
|---|
| 1903 | return VERR_SELM_LDT_OUT_OF_BOUNDS;
|
|---|
| 1904 | }
|
|---|
| 1905 | X86DESC LDTDesc;
|
|---|
| 1906 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTDesc, GDTR.pGdt + (SelLdt & X86_SEL_MASK), sizeof(LDTDesc));
|
|---|
| 1907 | if (RT_FAILURE(rc))
|
|---|
| 1908 | {
|
|---|
| 1909 | Log(("SELMR3DebugCheck: Failed to read LDT descriptor. rc=%d\n", rc));
|
|---|
| 1910 | return rc;
|
|---|
| 1911 | }
|
|---|
| 1912 | RTGCPTR GCPtrLDTEGuest = X86DESC_BASE(&LDTDesc);
|
|---|
| 1913 | uint32_t cbLdt = X86DESC_LIMIT_G(&LDTDesc);
|
|---|
| 1914 |
|
|---|
| 1915 | /*
|
|---|
| 1916 | * Validate it.
|
|---|
| 1917 | */
|
|---|
| 1918 | if (!cbLdt)
|
|---|
| 1919 | return VINF_SUCCESS;
|
|---|
| 1920 | /** @todo check what intel does about odd limits. */
|
|---|
| 1921 | AssertMsg(RT_ALIGN(cbLdt + 1, sizeof(X86DESC)) == cbLdt + 1 && cbLdt <= 0xffff, ("cbLdt=%d\n", cbLdt));
|
|---|
| 1922 | if ( LDTDesc.Gen.u1DescType
|
|---|
| 1923 | || LDTDesc.Gen.u4Type != X86_SEL_TYPE_SYS_LDT
|
|---|
| 1924 | || SelLdt >= pVM->selm.s.GuestGdtr.cbGdt)
|
|---|
| 1925 | {
|
|---|
| 1926 | Log(("SELmR3DebugCheck: Invalid LDT %04x!\n", SelLdt));
|
|---|
| 1927 | return VERR_SELM_INVALID_LDT;
|
|---|
| 1928 | }
|
|---|
| 1929 |
|
|---|
| 1930 | /*
|
|---|
| 1931 | * Loop thru the LDT checking each entry.
|
|---|
| 1932 | */
|
|---|
| 1933 | unsigned off = (GCPtrLDTEGuest & PAGE_OFFSET_MASK);
|
|---|
| 1934 | PX86DESC pLDTE = (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
|
|---|
| 1935 | PX86DESC pLDTEEnd = (PX86DESC)((uintptr_t)pGDTE + cbLdt);
|
|---|
| 1936 | while (pLDTE < pLDTEEnd)
|
|---|
| 1937 | {
|
|---|
| 1938 | X86DESC LDTEGuest;
|
|---|
| 1939 | rc = PGMPhysSimpleReadGCPtr(pVCpu, &LDTEGuest, GCPtrLDTEGuest, sizeof(LDTEGuest));
|
|---|
| 1940 | if (RT_SUCCESS(rc))
|
|---|
| 1941 | {
|
|---|
| 1942 | if ( pLDTE->Gen.u16LimitLow != LDTEGuest.Gen.u16LimitLow
|
|---|
| 1943 | || pLDTE->Gen.u4LimitHigh != LDTEGuest.Gen.u4LimitHigh
|
|---|
| 1944 | || pLDTE->Gen.u16BaseLow != LDTEGuest.Gen.u16BaseLow
|
|---|
| 1945 | || pLDTE->Gen.u8BaseHigh1 != LDTEGuest.Gen.u8BaseHigh1
|
|---|
| 1946 | || pLDTE->Gen.u8BaseHigh2 != LDTEGuest.Gen.u8BaseHigh2
|
|---|
| 1947 | || pLDTE->Gen.u1DefBig != LDTEGuest.Gen.u1DefBig
|
|---|
| 1948 | || pLDTE->Gen.u1DescType != LDTEGuest.Gen.u1DescType)
|
|---|
| 1949 | {
|
|---|
| 1950 | unsigned iLDT = pLDTE - (PX86DESC)((uintptr_t)pVM->selm.s.pvLdtR3 + off);
|
|---|
| 1951 | SELMR3DumpDescriptor(*pLDTE, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, shadow");
|
|---|
| 1952 | SELMR3DumpDescriptor(LDTEGuest, iLDT << 3, "SELMR3DebugCheck: LDT mismatch, guest");
|
|---|
| 1953 | }
|
|---|
| 1954 | }
|
|---|
| 1955 |
|
|---|
| 1956 | /* Advance to the next descriptor. */
|
|---|
| 1957 | GCPtrLDTEGuest += sizeof(X86DESC);
|
|---|
| 1958 | pLDTE++;
|
|---|
| 1959 | }
|
|---|
| 1960 |
|
|---|
| 1961 | #else /* !VBOX_STRICT */
|
|---|
| 1962 | NOREF(pVM);
|
|---|
| 1963 | #endif /* !VBOX_STRICT */
|
|---|
| 1964 |
|
|---|
| 1965 | return VINF_SUCCESS;
|
|---|
| 1966 | }
|
|---|
| 1967 |
|
|---|
| 1968 |
|
|---|
| 1969 | /**
|
|---|
| 1970 | * Validates the RawR0 TSS values against the one in the Guest TSS.
|
|---|
| 1971 | *
|
|---|
| 1972 | * @returns true if it matches.
|
|---|
| 1973 | * @returns false and assertions on mismatch..
|
|---|
| 1974 | * @param pVM Pointer to the VM.
|
|---|
| 1975 | */
|
|---|
| 1976 | VMMR3DECL(bool) SELMR3CheckTSS(PVM pVM)
|
|---|
| 1977 | {
|
|---|
| 1978 | #if defined(VBOX_STRICT) && defined(SELM_TRACK_GUEST_TSS_CHANGES)
|
|---|
| 1979 | PVMCPU pVCpu = VMMGetCpu(pVM);
|
|---|
| 1980 |
|
|---|
| 1981 | if (VMCPU_FF_ISSET(pVCpu, VMCPU_FF_SELM_SYNC_TSS))
|
|---|
| 1982 | return true;
|
|---|
| 1983 |
|
|---|
| 1984 | /*
|
|---|
| 1985 | * Get TR and extract the basic info.
|
|---|
| 1986 | */
|
|---|
| 1987 | CPUMSELREGHID trHid;
|
|---|
| 1988 | RTSEL SelTss = CPUMGetGuestTR(pVCpu, &trHid);
|
|---|
| 1989 | RTGCPTR GCPtrTss = trHid.u64Base;
|
|---|
| 1990 | uint32_t cbTss = trHid.u32Limit;
|
|---|
| 1991 | Assert( (SelTss & X86_SEL_MASK_OFF_RPL)
|
|---|
| 1992 | || (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
|
|---|
| 1993 | || (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */));
|
|---|
| 1994 | if (SelTss & X86_SEL_MASK_OFF_RPL)
|
|---|
| 1995 | {
|
|---|
| 1996 | AssertReturn(!(SelTss & X86_SEL_LDT), false);
|
|---|
| 1997 | AssertReturn(trHid.Attr.n.u1DescType == 0, false);
|
|---|
| 1998 | AssertReturn( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_286_TSS_BUSY
|
|---|
| 1999 | || trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY,
|
|---|
| 2000 | false);
|
|---|
| 2001 | if (!++cbTss)
|
|---|
| 2002 | cbTss = UINT32_MAX;
|
|---|
| 2003 | }
|
|---|
| 2004 | else
|
|---|
| 2005 | {
|
|---|
| 2006 | AssertReturn( (cbTss == 0 && GCPtrTss == 0 && trHid.Attr.u == 0 /* TR=0 */)
|
|---|
| 2007 | || (cbTss == 0xffff && GCPtrTss == 0 && trHid.Attr.n.u1Present && trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY /* RESET */),
|
|---|
| 2008 | false);
|
|---|
| 2009 | cbTss = 0; /* the reset case. */
|
|---|
| 2010 | }
|
|---|
| 2011 | AssertMsgReturn(pVM->selm.s.cbGuestTss == cbTss, ("%#x %#x\n", pVM->selm.s.cbGuestTss, cbTss), false);
|
|---|
| 2012 | AssertMsgReturn(pVM->selm.s.fGuestTss32Bit == ( trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_AVAIL
|
|---|
| 2013 | || trHid.Attr.n.u4Type == X86_SEL_TYPE_SYS_386_TSS_BUSY),
|
|---|
| 2014 | ("%RTbool u4Type=%d\n", pVM->selm.s.fGuestTss32Bit, trHid.Attr.n.u4Type),
|
|---|
| 2015 | false);
|
|---|
| 2016 | AssertMsgReturn( pVM->selm.s.GCSelTss == SelTss
|
|---|
| 2017 | || (!pVM->selm.s.GCSelTss && !(SelTss & X86_SEL_LDT)),
|
|---|
| 2018 | ("%#x %#x\n", pVM->selm.s.GCSelTss, SelTss),
|
|---|
| 2019 | false);
|
|---|
| 2020 | AssertMsgReturn( pVM->selm.s.GCPtrGuestTss == GCPtrTss
|
|---|
| 2021 | || (pVM->selm.s.GCPtrGuestTss == RTRCPTR_MAX && !GCPtrTss),
|
|---|
| 2022 | ("%#RGv %#RGv\n", pVM->selm.s.GCPtrGuestTss, GCPtrTss),
|
|---|
| 2023 | false);
|
|---|
| 2024 |
|
|---|
| 2025 |
|
|---|
| 2026 | /*
|
|---|
| 2027 | * Figure out the size of what need to monitor.
|
|---|
| 2028 | */
|
|---|
| 2029 | /* We're not interested in any 16-bit TSSes. */
|
|---|
| 2030 | uint32_t cbMonitoredTss = cbTss;
|
|---|
| 2031 | if ( trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL
|
|---|
| 2032 | && trHid.Attr.n.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
|
|---|
| 2033 | cbMonitoredTss = 0;
|
|---|
| 2034 | if (cbMonitoredTss)
|
|---|
| 2035 | {
|
|---|
| 2036 | VBOXTSS Tss;
|
|---|
| 2037 | uint32_t cr4 = CPUMGetGuestCR4(pVCpu);
|
|---|
| 2038 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss, GCPtrTss, RT_OFFSETOF(VBOXTSS, IntRedirBitmap));
|
|---|
| 2039 | AssertReturn( rc == VINF_SUCCESS
|
|---|
| 2040 | /* Happens early in XP boot during page table switching. */
|
|---|
| 2041 | || ( (rc == VERR_PAGE_TABLE_NOT_PRESENT || rc == VERR_PAGE_NOT_PRESENT)
|
|---|
| 2042 | && !(CPUMGetGuestEFlags(pVCpu) & X86_EFL_IF)),
|
|---|
| 2043 | false);
|
|---|
| 2044 | if ( !(cr4 & X86_CR4_VME)
|
|---|
| 2045 | || ( RT_SUCCESS(rc)
|
|---|
| 2046 | && Tss.offIoBitmap < sizeof(VBOXTSS) /* too small */
|
|---|
| 2047 | && Tss.offIoBitmap > cbTss)
|
|---|
| 2048 | )
|
|---|
| 2049 | cbMonitoredTss = RT_UOFFSETOF(VBOXTSS, padding_ss0);
|
|---|
| 2050 | else if (RT_SUCCESS(rc))
|
|---|
| 2051 | {
|
|---|
| 2052 | cbMonitoredTss = Tss.offIoBitmap;
|
|---|
| 2053 | AssertMsgReturn(pVM->selm.s.offGuestIoBitmap == Tss.offIoBitmap,
|
|---|
| 2054 | ("#x %#x\n", pVM->selm.s.offGuestIoBitmap, Tss.offIoBitmap),
|
|---|
| 2055 | false);
|
|---|
| 2056 |
|
|---|
| 2057 | /* check the bitmap */
|
|---|
| 2058 | uint32_t offRedirBitmap = Tss.offIoBitmap - sizeof(Tss.IntRedirBitmap);
|
|---|
| 2059 | rc = PGMPhysSimpleReadGCPtr(pVCpu, &Tss.IntRedirBitmap,
|
|---|
| 2060 | GCPtrTss + offRedirBitmap, sizeof(Tss.IntRedirBitmap));
|
|---|
| 2061 | AssertRCReturn(rc, false);
|
|---|
| 2062 | AssertMsgReturn(!memcmp(&Tss.IntRedirBitmap[0], &pVM->selm.s.Tss.IntRedirBitmap[0], sizeof(Tss.IntRedirBitmap)),
|
|---|
| 2063 | ("offIoBitmap=%#x cbTss=%#x\n"
|
|---|
| 2064 | " Guest: %.32Rhxs\n"
|
|---|
| 2065 | "Shadow: %.32Rhxs\n",
|
|---|
| 2066 | Tss.offIoBitmap, cbTss,
|
|---|
| 2067 | &Tss.IntRedirBitmap[0],
|
|---|
| 2068 | &pVM->selm.s.Tss.IntRedirBitmap[0]),
|
|---|
| 2069 | false);
|
|---|
| 2070 | }
|
|---|
| 2071 | else
|
|---|
| 2072 | cbMonitoredTss = RT_OFFSETOF(VBOXTSS, IntRedirBitmap);
|
|---|
| 2073 |
|
|---|
| 2074 | /*
|
|---|
| 2075 | * Check SS0 and ESP0.
|
|---|
| 2076 | */
|
|---|
| 2077 | if ( !pVM->selm.s.fSyncTSSRing0Stack
|
|---|
| 2078 | && RT_SUCCESS(rc))
|
|---|
| 2079 | {
|
|---|
| 2080 | if ( Tss.esp0 != pVM->selm.s.Tss.esp1
|
|---|
| 2081 | || Tss.ss0 != (pVM->selm.s.Tss.ss1 & ~1))
|
|---|
| 2082 | {
|
|---|
| 2083 | RTGCPHYS GCPhys;
|
|---|
| 2084 | rc = PGMGstGetPage(pVCpu, GCPtrTss, NULL, &GCPhys); AssertRC(rc);
|
|---|
| 2085 | AssertMsgFailed(("TSS out of sync!! (%04X:%08X vs %04X:%08X (guest)) Tss=%RGv Phys=%RGp\n",
|
|---|
| 2086 | (pVM->selm.s.Tss.ss1 & ~1), pVM->selm.s.Tss.esp1,
|
|---|
| 2087 | Tss.ss1, Tss.esp1, GCPtrTss, GCPhys));
|
|---|
| 2088 | return false;
|
|---|
| 2089 | }
|
|---|
| 2090 | }
|
|---|
| 2091 | AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
|
|---|
| 2092 | }
|
|---|
| 2093 | else
|
|---|
| 2094 | {
|
|---|
| 2095 | AssertMsgReturn(pVM->selm.s.Tss.ss1 == 0 && pVM->selm.s.Tss.esp1 == 0, ("%04x:%08x\n", pVM->selm.s.Tss.ss1, pVM->selm.s.Tss.esp1), false);
|
|---|
| 2096 | AssertReturn(!pVM->selm.s.fSyncTSSRing0Stack, false);
|
|---|
| 2097 | AssertMsgReturn(pVM->selm.s.cbMonitoredGuestTss == cbMonitoredTss, ("%#x %#x\n", pVM->selm.s.cbMonitoredGuestTss, cbMonitoredTss), false);
|
|---|
| 2098 | }
|
|---|
| 2099 |
|
|---|
| 2100 |
|
|---|
| 2101 |
|
|---|
| 2102 | return true;
|
|---|
| 2103 |
|
|---|
| 2104 | #else /* !VBOX_STRICT */
|
|---|
| 2105 | NOREF(pVM);
|
|---|
| 2106 | return true;
|
|---|
| 2107 | #endif /* !VBOX_STRICT */
|
|---|
| 2108 | }
|
|---|
| 2109 |
|
|---|
| 2110 |
|
|---|
| 2111 | # ifdef VBOX_WITH_SAFE_STR
|
|---|
| 2112 | /**
|
|---|
| 2113 | * Validates the RawR0 TR shadow GDT entry.
|
|---|
| 2114 | *
|
|---|
| 2115 | * @returns true if it matches.
|
|---|
| 2116 | * @returns false and assertions on mismatch..
|
|---|
| 2117 | * @param pVM Pointer to the VM.
|
|---|
| 2118 | */
|
|---|
| 2119 | VMMR3DECL(bool) SELMR3CheckShadowTR(PVM pVM)
|
|---|
| 2120 | {
|
|---|
| 2121 | # ifdef VBOX_STRICT
|
|---|
| 2122 | PX86DESC paGdt = pVM->selm.s.paGdtR3;
|
|---|
| 2123 |
|
|---|
| 2124 | /*
|
|---|
| 2125 | * TSS descriptor
|
|---|
| 2126 | */
|
|---|
| 2127 | PX86DESC pDesc = &paGdt[pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> 3];
|
|---|
| 2128 | RTRCPTR RCPtrTSS = VM_RC_ADDR(pVM, &pVM->selm.s.Tss);
|
|---|
| 2129 |
|
|---|
| 2130 | if ( pDesc->Gen.u16BaseLow != RT_LOWORD(RCPtrTSS)
|
|---|
| 2131 | || pDesc->Gen.u8BaseHigh1 != RT_BYTE3(RCPtrTSS)
|
|---|
| 2132 | || pDesc->Gen.u8BaseHigh2 != RT_BYTE4(RCPtrTSS)
|
|---|
| 2133 | || pDesc->Gen.u16LimitLow != sizeof(VBOXTSS) - 1
|
|---|
| 2134 | || pDesc->Gen.u4LimitHigh != 0
|
|---|
| 2135 | || (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_AVAIL && pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_386_TSS_BUSY)
|
|---|
| 2136 | || pDesc->Gen.u1DescType != 0 /* system */
|
|---|
| 2137 | || pDesc->Gen.u2Dpl != 0 /* supervisor */
|
|---|
| 2138 | || pDesc->Gen.u1Present != 1
|
|---|
| 2139 | || pDesc->Gen.u1Available != 0
|
|---|
| 2140 | || pDesc->Gen.u1Long != 0
|
|---|
| 2141 | || pDesc->Gen.u1DefBig != 0
|
|---|
| 2142 | || pDesc->Gen.u1Granularity != 0 /* byte limit */
|
|---|
| 2143 | )
|
|---|
| 2144 | {
|
|---|
| 2145 | AssertFailed();
|
|---|
| 2146 | return false;
|
|---|
| 2147 | }
|
|---|
| 2148 | # endif
|
|---|
| 2149 | return true;
|
|---|
| 2150 | }
|
|---|
| 2151 | # endif /* VBOX_WITH_SAFE_STR */
|
|---|
| 2152 |
|
|---|
| 2153 | #endif /* VBOX_WITH_RAW_MODE */
|
|---|
| 2154 |
|
|---|
| 2155 | /**
|
|---|
| 2156 | * Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
|
|---|
| 2157 | *
|
|---|
| 2158 | * See SELMR3GetSelectorInfo for details.
|
|---|
| 2159 | *
|
|---|
| 2160 | * @returns VBox status code, see SELMR3GetSelectorInfo for details.
|
|---|
| 2161 | *
|
|---|
| 2162 | * @param pVCpu Pointer to the VMCPU.
|
|---|
| 2163 | * @param Sel The selector to get info about.
|
|---|
| 2164 | * @param pSelInfo Where to store the information.
|
|---|
| 2165 | */
|
|---|
| 2166 | static int selmR3GetSelectorInfo64(PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
|
|---|
| 2167 | {
|
|---|
| 2168 | /*
|
|---|
| 2169 | * Read it from the guest descriptor table.
|
|---|
| 2170 | */
|
|---|
| 2171 | /** @todo this is bogus wrt the LDT/GDT limit on long selectors. */
|
|---|
| 2172 | X86DESC64 Desc;
|
|---|
| 2173 | RTGCPTR GCPtrDesc;
|
|---|
| 2174 | if (!(Sel & X86_SEL_LDT))
|
|---|
| 2175 | {
|
|---|
| 2176 | /* GDT */
|
|---|
| 2177 | VBOXGDTR Gdtr;
|
|---|
| 2178 | CPUMGetGuestGDTR(pVCpu, &Gdtr);
|
|---|
| 2179 | if ((Sel | X86_SEL_RPL_LDT) > Gdtr.cbGdt)
|
|---|
| 2180 | return VERR_INVALID_SELECTOR;
|
|---|
| 2181 | GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
|
|---|
| 2182 | }
|
|---|
| 2183 | else
|
|---|
| 2184 | {
|
|---|
| 2185 | /* LDT */
|
|---|
| 2186 | uint64_t GCPtrBase;
|
|---|
| 2187 | uint32_t cbLimit;
|
|---|
| 2188 | CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
|
|---|
| 2189 | if ((Sel | X86_SEL_RPL_LDT) > cbLimit)
|
|---|
| 2190 | return VERR_INVALID_SELECTOR;
|
|---|
| 2191 |
|
|---|
| 2192 | /* calc the descriptor location. */
|
|---|
| 2193 | GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
|
|---|
| 2194 | }
|
|---|
| 2195 |
|
|---|
| 2196 | /* read the descriptor. */
|
|---|
| 2197 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
|
|---|
| 2198 | if (RT_FAILURE(rc))
|
|---|
| 2199 | {
|
|---|
| 2200 | rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(X86DESC));
|
|---|
| 2201 | if (RT_FAILURE(rc))
|
|---|
| 2202 | return rc;
|
|---|
| 2203 | Desc.au64[1] = 0;
|
|---|
| 2204 | }
|
|---|
| 2205 |
|
|---|
| 2206 | /*
|
|---|
| 2207 | * Extract the base and limit
|
|---|
| 2208 | * (We ignore the present bit here, which is probably a bit silly...)
|
|---|
| 2209 | */
|
|---|
| 2210 | pSelInfo->Sel = Sel;
|
|---|
| 2211 | pSelInfo->fFlags = DBGFSELINFO_FLAGS_LONG_MODE;
|
|---|
| 2212 | pSelInfo->u.Raw64 = Desc;
|
|---|
| 2213 | if (Desc.Gen.u1DescType)
|
|---|
| 2214 | {
|
|---|
| 2215 | /*
|
|---|
| 2216 | * 64-bit code selectors are wide open, it's not possible to detect
|
|---|
| 2217 | * 64-bit data or stack selectors without also dragging in assumptions
|
|---|
| 2218 | * about current CS (i.e. that's we're executing in 64-bit mode). So,
|
|---|
| 2219 | * the selinfo user needs to deal with this in the context the info is
|
|---|
| 2220 | * used unfortunately.
|
|---|
| 2221 | */
|
|---|
| 2222 | if ( Desc.Gen.u1Long
|
|---|
| 2223 | && !Desc.Gen.u1DefBig
|
|---|
| 2224 | && (Desc.Gen.u4Type & X86_SEL_TYPE_CODE))
|
|---|
| 2225 | {
|
|---|
| 2226 | /* Note! We ignore the segment limit hacks that was added by AMD. */
|
|---|
| 2227 | pSelInfo->GCPtrBase = 0;
|
|---|
| 2228 | pSelInfo->cbLimit = ~(RTGCUINTPTR)0;
|
|---|
| 2229 | }
|
|---|
| 2230 | else
|
|---|
| 2231 | {
|
|---|
| 2232 | pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
|
|---|
| 2233 | pSelInfo->GCPtrBase = X86DESC_BASE(&Desc);
|
|---|
| 2234 | }
|
|---|
| 2235 | pSelInfo->SelGate = 0;
|
|---|
| 2236 | }
|
|---|
| 2237 | else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_LDT
|
|---|
| 2238 | || Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_AVAIL
|
|---|
| 2239 | || Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TSS_BUSY)
|
|---|
| 2240 | {
|
|---|
| 2241 | /* Note. LDT descriptors are weird in long mode, we ignore the footnote
|
|---|
| 2242 | in the AMD manual here as a simplification. */
|
|---|
| 2243 | pSelInfo->GCPtrBase = X86DESC64_BASE(&Desc);
|
|---|
| 2244 | pSelInfo->cbLimit = X86DESC_LIMIT_G(&Desc);
|
|---|
| 2245 | pSelInfo->SelGate = 0;
|
|---|
| 2246 | }
|
|---|
| 2247 | else if ( Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_CALL_GATE
|
|---|
| 2248 | || Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_TRAP_GATE
|
|---|
| 2249 | || Desc.Gen.u4Type == AMD64_SEL_TYPE_SYS_INT_GATE)
|
|---|
| 2250 | {
|
|---|
| 2251 | pSelInfo->cbLimit = X86DESC64_BASE(&Desc);
|
|---|
| 2252 | pSelInfo->GCPtrBase = Desc.Gate.u16OffsetLow
|
|---|
| 2253 | | ((uint32_t)Desc.Gate.u16OffsetHigh << 16)
|
|---|
| 2254 | | ((uint64_t)Desc.Gate.u32OffsetTop << 32);
|
|---|
| 2255 | pSelInfo->SelGate = Desc.Gate.u16Sel;
|
|---|
| 2256 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_GATE;
|
|---|
| 2257 | }
|
|---|
| 2258 | else
|
|---|
| 2259 | {
|
|---|
| 2260 | pSelInfo->cbLimit = 0;
|
|---|
| 2261 | pSelInfo->GCPtrBase = 0;
|
|---|
| 2262 | pSelInfo->SelGate = 0;
|
|---|
| 2263 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_INVALID;
|
|---|
| 2264 | }
|
|---|
| 2265 | if (!Desc.Gen.u1Present)
|
|---|
| 2266 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_NOT_PRESENT;
|
|---|
| 2267 |
|
|---|
| 2268 | return VINF_SUCCESS;
|
|---|
| 2269 | }
|
|---|
| 2270 |
|
|---|
| 2271 |
|
|---|
| 2272 | /**
|
|---|
| 2273 | * Worker for selmR3GetSelectorInfo32 and SELMR3GetShadowSelectorInfo that
|
|---|
| 2274 | * interprets a legacy descriptor table entry and fills in the selector info
|
|---|
| 2275 | * structure from it.
|
|---|
| 2276 | *
|
|---|
| 2277 | * @param pSelInfo Where to store the selector info. Only the fFlags and
|
|---|
| 2278 | * Sel members have been initialized.
|
|---|
| 2279 | * @param pDesc The legacy descriptor to parse.
|
|---|
| 2280 | */
|
|---|
| 2281 | DECLINLINE(void) selmR3SelInfoFromDesc32(PDBGFSELINFO pSelInfo, PCX86DESC pDesc)
|
|---|
| 2282 | {
|
|---|
| 2283 | pSelInfo->u.Raw64.au64[1] = 0;
|
|---|
| 2284 | pSelInfo->u.Raw = *pDesc;
|
|---|
| 2285 | if ( pDesc->Gen.u1DescType
|
|---|
| 2286 | || !(pDesc->Gen.u4Type & 4))
|
|---|
| 2287 | {
|
|---|
| 2288 | pSelInfo->cbLimit = X86DESC_LIMIT_G(pDesc);
|
|---|
| 2289 | pSelInfo->GCPtrBase = X86DESC_BASE(pDesc);
|
|---|
| 2290 | pSelInfo->SelGate = 0;
|
|---|
| 2291 | }
|
|---|
| 2292 | else if (pDesc->Gen.u4Type != X86_SEL_TYPE_SYS_UNDEFINED4)
|
|---|
| 2293 | {
|
|---|
| 2294 | pSelInfo->cbLimit = 0;
|
|---|
| 2295 | if (pDesc->Gen.u4Type == X86_SEL_TYPE_SYS_TASK_GATE)
|
|---|
| 2296 | pSelInfo->GCPtrBase = 0;
|
|---|
| 2297 | else
|
|---|
| 2298 | pSelInfo->GCPtrBase = pDesc->Gate.u16OffsetLow
|
|---|
| 2299 | | (uint32_t)pDesc->Gate.u16OffsetHigh << 16;
|
|---|
| 2300 | pSelInfo->SelGate = pDesc->Gate.u16Sel;
|
|---|
| 2301 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_GATE;
|
|---|
| 2302 | }
|
|---|
| 2303 | else
|
|---|
| 2304 | {
|
|---|
| 2305 | pSelInfo->cbLimit = 0;
|
|---|
| 2306 | pSelInfo->GCPtrBase = 0;
|
|---|
| 2307 | pSelInfo->SelGate = 0;
|
|---|
| 2308 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_INVALID;
|
|---|
| 2309 | }
|
|---|
| 2310 | if (!pDesc->Gen.u1Present)
|
|---|
| 2311 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_NOT_PRESENT;
|
|---|
| 2312 | }
|
|---|
| 2313 |
|
|---|
| 2314 |
|
|---|
| 2315 | /**
|
|---|
| 2316 | * Gets information about a 64-bit selector, SELMR3GetSelectorInfo helper.
|
|---|
| 2317 | *
|
|---|
| 2318 | * See SELMR3GetSelectorInfo for details.
|
|---|
| 2319 | *
|
|---|
| 2320 | * @returns VBox status code, see SELMR3GetSelectorInfo for details.
|
|---|
| 2321 | *
|
|---|
| 2322 | * @param pVM Pointer to the VM.
|
|---|
| 2323 | * @param pVCpu Pointer to the VMCPU.
|
|---|
| 2324 | * @param Sel The selector to get info about.
|
|---|
| 2325 | * @param pSelInfo Where to store the information.
|
|---|
| 2326 | */
|
|---|
| 2327 | static int selmR3GetSelectorInfo32(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
|
|---|
| 2328 | {
|
|---|
| 2329 | /*
|
|---|
| 2330 | * Read the descriptor entry
|
|---|
| 2331 | */
|
|---|
| 2332 | pSelInfo->fFlags = 0;
|
|---|
| 2333 | X86DESC Desc;
|
|---|
| 2334 | if ( !(Sel & X86_SEL_LDT)
|
|---|
| 2335 | && ( pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_RPL_LDT)
|
|---|
| 2336 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_RPL_LDT)
|
|---|
| 2337 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_RPL_LDT)
|
|---|
| 2338 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_RPL_LDT)
|
|---|
| 2339 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_RPL_LDT))
|
|---|
| 2340 | )
|
|---|
| 2341 | {
|
|---|
| 2342 | /*
|
|---|
| 2343 | * Hypervisor descriptor.
|
|---|
| 2344 | */
|
|---|
| 2345 | pSelInfo->fFlags = DBGFSELINFO_FLAGS_HYPER;
|
|---|
| 2346 | if (CPUMIsGuestInProtectedMode(pVCpu))
|
|---|
| 2347 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_PROT_MODE;
|
|---|
| 2348 | else
|
|---|
| 2349 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_REAL_MODE;
|
|---|
| 2350 |
|
|---|
| 2351 | Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
|
|---|
| 2352 | }
|
|---|
| 2353 | else if (CPUMIsGuestInProtectedMode(pVCpu))
|
|---|
| 2354 | {
|
|---|
| 2355 | /*
|
|---|
| 2356 | * Read it from the guest descriptor table.
|
|---|
| 2357 | */
|
|---|
| 2358 | pSelInfo->fFlags = DBGFSELINFO_FLAGS_PROT_MODE;
|
|---|
| 2359 |
|
|---|
| 2360 | RTGCPTR GCPtrDesc;
|
|---|
| 2361 | if (!(Sel & X86_SEL_LDT))
|
|---|
| 2362 | {
|
|---|
| 2363 | /* GDT */
|
|---|
| 2364 | VBOXGDTR Gdtr;
|
|---|
| 2365 | CPUMGetGuestGDTR(pVCpu, &Gdtr);
|
|---|
| 2366 | if ((Sel | X86_SEL_RPL_LDT) > Gdtr.cbGdt)
|
|---|
| 2367 | return VERR_INVALID_SELECTOR;
|
|---|
| 2368 | GCPtrDesc = Gdtr.pGdt + (Sel & X86_SEL_MASK);
|
|---|
| 2369 | }
|
|---|
| 2370 | else
|
|---|
| 2371 | {
|
|---|
| 2372 | /* LDT */
|
|---|
| 2373 | uint64_t GCPtrBase;
|
|---|
| 2374 | uint32_t cbLimit;
|
|---|
| 2375 | CPUMGetGuestLdtrEx(pVCpu, &GCPtrBase, &cbLimit);
|
|---|
| 2376 | if ((Sel | X86_SEL_RPL_LDT) > cbLimit)
|
|---|
| 2377 | return VERR_INVALID_SELECTOR;
|
|---|
| 2378 |
|
|---|
| 2379 | /* calc the descriptor location. */
|
|---|
| 2380 | GCPtrDesc = GCPtrBase + (Sel & X86_SEL_MASK);
|
|---|
| 2381 | }
|
|---|
| 2382 |
|
|---|
| 2383 | /* read the descriptor. */
|
|---|
| 2384 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &Desc, GCPtrDesc, sizeof(Desc));
|
|---|
| 2385 | if (RT_FAILURE(rc))
|
|---|
| 2386 | return rc;
|
|---|
| 2387 | }
|
|---|
| 2388 | else
|
|---|
| 2389 | {
|
|---|
| 2390 | /*
|
|---|
| 2391 | * We're in real mode.
|
|---|
| 2392 | */
|
|---|
| 2393 | pSelInfo->Sel = Sel;
|
|---|
| 2394 | pSelInfo->GCPtrBase = Sel << 4;
|
|---|
| 2395 | pSelInfo->cbLimit = 0xffff;
|
|---|
| 2396 | pSelInfo->fFlags = DBGFSELINFO_FLAGS_REAL_MODE;
|
|---|
| 2397 | pSelInfo->u.Raw64.au64[0] = 0;
|
|---|
| 2398 | pSelInfo->u.Raw64.au64[1] = 0;
|
|---|
| 2399 | pSelInfo->SelGate = 0;
|
|---|
| 2400 | return VINF_SUCCESS;
|
|---|
| 2401 | }
|
|---|
| 2402 |
|
|---|
| 2403 | /*
|
|---|
| 2404 | * Extract the base and limit or sel:offset for gates.
|
|---|
| 2405 | */
|
|---|
| 2406 | pSelInfo->Sel = Sel;
|
|---|
| 2407 | selmR3SelInfoFromDesc32(pSelInfo, &Desc);
|
|---|
| 2408 |
|
|---|
| 2409 | return VINF_SUCCESS;
|
|---|
| 2410 | }
|
|---|
| 2411 |
|
|---|
| 2412 |
|
|---|
| 2413 | /**
|
|---|
| 2414 | * Gets information about a selector.
|
|---|
| 2415 | *
|
|---|
| 2416 | * Intended for the debugger mostly and will prefer the guest descriptor tables
|
|---|
| 2417 | * over the shadow ones.
|
|---|
| 2418 | *
|
|---|
| 2419 | * @retval VINF_SUCCESS on success.
|
|---|
| 2420 | * @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
|
|---|
| 2421 | * descriptor table.
|
|---|
| 2422 | * @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
|
|---|
| 2423 | * is not returned if the selector itself isn't present, you have to
|
|---|
| 2424 | * check that for yourself (see DBGFSELINFO::fFlags).
|
|---|
| 2425 | * @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
|
|---|
| 2426 | * pagetable or page backing the selector table wasn't present.
|
|---|
| 2427 | * @returns Other VBox status code on other errors.
|
|---|
| 2428 | *
|
|---|
| 2429 | * @param pVM Pointer to the VM.
|
|---|
| 2430 | * @param pVCpu Pointer to the VMCPU.
|
|---|
| 2431 | * @param Sel The selector to get info about.
|
|---|
| 2432 | * @param pSelInfo Where to store the information.
|
|---|
| 2433 | */
|
|---|
| 2434 | VMMR3DECL(int) SELMR3GetSelectorInfo(PVM pVM, PVMCPU pVCpu, RTSEL Sel, PDBGFSELINFO pSelInfo)
|
|---|
| 2435 | {
|
|---|
| 2436 | AssertPtr(pSelInfo);
|
|---|
| 2437 | if (CPUMIsGuestInLongMode(pVCpu))
|
|---|
| 2438 | return selmR3GetSelectorInfo64(pVCpu, Sel, pSelInfo);
|
|---|
| 2439 | return selmR3GetSelectorInfo32(pVM, pVCpu, Sel, pSelInfo);
|
|---|
| 2440 | }
|
|---|
| 2441 |
|
|---|
| 2442 |
|
|---|
| 2443 | /**
|
|---|
| 2444 | * Gets information about a selector from the shadow tables.
|
|---|
| 2445 | *
|
|---|
| 2446 | * This is intended to be faster than the SELMR3GetSelectorInfo() method, but
|
|---|
| 2447 | * requires that the caller ensures that the shadow tables are up to date.
|
|---|
| 2448 | *
|
|---|
| 2449 | * @retval VINF_SUCCESS on success.
|
|---|
| 2450 | * @retval VERR_INVALID_SELECTOR if the selector isn't fully inside the
|
|---|
| 2451 | * descriptor table.
|
|---|
| 2452 | * @retval VERR_SELECTOR_NOT_PRESENT if the LDT is invalid or not present. This
|
|---|
| 2453 | * is not returned if the selector itself isn't present, you have to
|
|---|
| 2454 | * check that for yourself (see DBGFSELINFO::fFlags).
|
|---|
| 2455 | * @retval VERR_PAGE_TABLE_NOT_PRESENT or VERR_PAGE_NOT_PRESENT if the
|
|---|
| 2456 | * pagetable or page backing the selector table wasn't present.
|
|---|
| 2457 | * @returns Other VBox status code on other errors.
|
|---|
| 2458 | *
|
|---|
| 2459 | * @param pVM Pointer to the VM.
|
|---|
| 2460 | * @param Sel The selector to get info about.
|
|---|
| 2461 | * @param pSelInfo Where to store the information.
|
|---|
| 2462 | *
|
|---|
| 2463 | * @remarks Don't use this when in hardware assisted virtualization mode.
|
|---|
| 2464 | */
|
|---|
| 2465 | VMMR3DECL(int) SELMR3GetShadowSelectorInfo(PVM pVM, RTSEL Sel, PDBGFSELINFO pSelInfo)
|
|---|
| 2466 | {
|
|---|
| 2467 | Assert(pSelInfo);
|
|---|
| 2468 |
|
|---|
| 2469 | /*
|
|---|
| 2470 | * Read the descriptor entry
|
|---|
| 2471 | */
|
|---|
| 2472 | X86DESC Desc;
|
|---|
| 2473 | if (!(Sel & X86_SEL_LDT))
|
|---|
| 2474 | {
|
|---|
| 2475 | /*
|
|---|
| 2476 | * Global descriptor.
|
|---|
| 2477 | */
|
|---|
| 2478 | Desc = pVM->selm.s.paGdtR3[Sel >> X86_SEL_SHIFT];
|
|---|
| 2479 | pSelInfo->fFlags = pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] == (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 2480 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] == (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 2481 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] == (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 2482 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] == (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 2483 | || pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] == (Sel & X86_SEL_MASK_OFF_RPL)
|
|---|
| 2484 | ? DBGFSELINFO_FLAGS_HYPER
|
|---|
| 2485 | : 0;
|
|---|
| 2486 | /** @todo check that the GDT offset is valid. */
|
|---|
| 2487 | }
|
|---|
| 2488 | else
|
|---|
| 2489 | {
|
|---|
| 2490 | /*
|
|---|
| 2491 | * Local Descriptor.
|
|---|
| 2492 | */
|
|---|
| 2493 | PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
|
|---|
| 2494 | Desc = paLDT[Sel >> X86_SEL_SHIFT];
|
|---|
| 2495 | /** @todo check if the LDT page is actually available. */
|
|---|
| 2496 | /** @todo check that the LDT offset is valid. */
|
|---|
| 2497 | pSelInfo->fFlags = 0;
|
|---|
| 2498 | }
|
|---|
| 2499 | if (CPUMIsGuestInProtectedMode(VMMGetCpu0(pVM)))
|
|---|
| 2500 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_PROT_MODE;
|
|---|
| 2501 | else
|
|---|
| 2502 | pSelInfo->fFlags |= DBGFSELINFO_FLAGS_REAL_MODE;
|
|---|
| 2503 |
|
|---|
| 2504 | /*
|
|---|
| 2505 | * Extract the base and limit or sel:offset for gates.
|
|---|
| 2506 | */
|
|---|
| 2507 | pSelInfo->Sel = Sel;
|
|---|
| 2508 | selmR3SelInfoFromDesc32(pSelInfo, &Desc);
|
|---|
| 2509 |
|
|---|
| 2510 | return VINF_SUCCESS;
|
|---|
| 2511 | }
|
|---|
| 2512 |
|
|---|
| 2513 |
|
|---|
| 2514 | /**
|
|---|
| 2515 | * Formats a descriptor.
|
|---|
| 2516 | *
|
|---|
| 2517 | * @param Desc Descriptor to format.
|
|---|
| 2518 | * @param Sel Selector number.
|
|---|
| 2519 | * @param pszOutput Output buffer.
|
|---|
| 2520 | * @param cchOutput Size of output buffer.
|
|---|
| 2521 | */
|
|---|
| 2522 | static void selmR3FormatDescriptor(X86DESC Desc, RTSEL Sel, char *pszOutput, size_t cchOutput)
|
|---|
| 2523 | {
|
|---|
| 2524 | /*
|
|---|
| 2525 | * Make variable description string.
|
|---|
| 2526 | */
|
|---|
| 2527 | static struct
|
|---|
| 2528 | {
|
|---|
| 2529 | unsigned cch;
|
|---|
| 2530 | const char *psz;
|
|---|
| 2531 | } const aTypes[32] =
|
|---|
| 2532 | {
|
|---|
| 2533 | #define STRENTRY(str) { sizeof(str) - 1, str }
|
|---|
| 2534 | /* system */
|
|---|
| 2535 | STRENTRY("Reserved0 "), /* 0x00 */
|
|---|
| 2536 | STRENTRY("TSS16Avail "), /* 0x01 */
|
|---|
| 2537 | STRENTRY("LDT "), /* 0x02 */
|
|---|
| 2538 | STRENTRY("TSS16Busy "), /* 0x03 */
|
|---|
| 2539 | STRENTRY("Call16 "), /* 0x04 */
|
|---|
| 2540 | STRENTRY("Task "), /* 0x05 */
|
|---|
| 2541 | STRENTRY("Int16 "), /* 0x06 */
|
|---|
| 2542 | STRENTRY("Trap16 "), /* 0x07 */
|
|---|
| 2543 | STRENTRY("Reserved8 "), /* 0x08 */
|
|---|
| 2544 | STRENTRY("TSS32Avail "), /* 0x09 */
|
|---|
| 2545 | STRENTRY("ReservedA "), /* 0x0a */
|
|---|
| 2546 | STRENTRY("TSS32Busy "), /* 0x0b */
|
|---|
| 2547 | STRENTRY("Call32 "), /* 0x0c */
|
|---|
| 2548 | STRENTRY("ReservedD "), /* 0x0d */
|
|---|
| 2549 | STRENTRY("Int32 "), /* 0x0e */
|
|---|
| 2550 | STRENTRY("Trap32 "), /* 0x0f */
|
|---|
| 2551 | /* non system */
|
|---|
| 2552 | STRENTRY("DataRO "), /* 0x10 */
|
|---|
| 2553 | STRENTRY("DataRO Accessed "), /* 0x11 */
|
|---|
| 2554 | STRENTRY("DataRW "), /* 0x12 */
|
|---|
| 2555 | STRENTRY("DataRW Accessed "), /* 0x13 */
|
|---|
| 2556 | STRENTRY("DataDownRO "), /* 0x14 */
|
|---|
| 2557 | STRENTRY("DataDownRO Accessed "), /* 0x15 */
|
|---|
| 2558 | STRENTRY("DataDownRW "), /* 0x16 */
|
|---|
| 2559 | STRENTRY("DataDownRW Accessed "), /* 0x17 */
|
|---|
| 2560 | STRENTRY("CodeEO "), /* 0x18 */
|
|---|
| 2561 | STRENTRY("CodeEO Accessed "), /* 0x19 */
|
|---|
| 2562 | STRENTRY("CodeER "), /* 0x1a */
|
|---|
| 2563 | STRENTRY("CodeER Accessed "), /* 0x1b */
|
|---|
| 2564 | STRENTRY("CodeConfEO "), /* 0x1c */
|
|---|
| 2565 | STRENTRY("CodeConfEO Accessed "), /* 0x1d */
|
|---|
| 2566 | STRENTRY("CodeConfER "), /* 0x1e */
|
|---|
| 2567 | STRENTRY("CodeConfER Accessed ") /* 0x1f */
|
|---|
| 2568 | #undef SYSENTRY
|
|---|
| 2569 | };
|
|---|
| 2570 | #define ADD_STR(psz, pszAdd) do { strcpy(psz, pszAdd); psz += strlen(pszAdd); } while (0)
|
|---|
| 2571 | char szMsg[128];
|
|---|
| 2572 | char *psz = &szMsg[0];
|
|---|
| 2573 | unsigned i = Desc.Gen.u1DescType << 4 | Desc.Gen.u4Type;
|
|---|
| 2574 | memcpy(psz, aTypes[i].psz, aTypes[i].cch);
|
|---|
| 2575 | psz += aTypes[i].cch;
|
|---|
| 2576 |
|
|---|
| 2577 | if (Desc.Gen.u1Present)
|
|---|
| 2578 | ADD_STR(psz, "Present ");
|
|---|
| 2579 | else
|
|---|
| 2580 | ADD_STR(psz, "Not-Present ");
|
|---|
| 2581 | if (Desc.Gen.u1Granularity)
|
|---|
| 2582 | ADD_STR(psz, "Page ");
|
|---|
| 2583 | if (Desc.Gen.u1DefBig)
|
|---|
| 2584 | ADD_STR(psz, "32-bit ");
|
|---|
| 2585 | else
|
|---|
| 2586 | ADD_STR(psz, "16-bit ");
|
|---|
| 2587 | #undef ADD_STR
|
|---|
| 2588 | *psz = '\0';
|
|---|
| 2589 |
|
|---|
| 2590 | /*
|
|---|
| 2591 | * Limit and Base and format the output.
|
|---|
| 2592 | */
|
|---|
| 2593 | uint32_t u32Limit = X86DESC_LIMIT_G(&Desc);
|
|---|
| 2594 | uint32_t u32Base = X86DESC_BASE(&Desc);
|
|---|
| 2595 |
|
|---|
| 2596 | RTStrPrintf(pszOutput, cchOutput, "%04x - %08x %08x - base=%08x limit=%08x dpl=%d %s",
|
|---|
| 2597 | Sel, Desc.au32[0], Desc.au32[1], u32Base, u32Limit, Desc.Gen.u2Dpl, szMsg);
|
|---|
| 2598 | }
|
|---|
| 2599 |
|
|---|
| 2600 |
|
|---|
| 2601 | /**
|
|---|
| 2602 | * Dumps a descriptor.
|
|---|
| 2603 | *
|
|---|
| 2604 | * @param Desc Descriptor to dump.
|
|---|
| 2605 | * @param Sel Selector number.
|
|---|
| 2606 | * @param pszMsg Message to prepend the log entry with.
|
|---|
| 2607 | */
|
|---|
| 2608 | VMMR3DECL(void) SELMR3DumpDescriptor(X86DESC Desc, RTSEL Sel, const char *pszMsg)
|
|---|
| 2609 | {
|
|---|
| 2610 | char szOutput[128];
|
|---|
| 2611 | selmR3FormatDescriptor(Desc, Sel, &szOutput[0], sizeof(szOutput));
|
|---|
| 2612 | Log(("%s: %s\n", pszMsg, szOutput));
|
|---|
| 2613 | NOREF(szOutput[0]);
|
|---|
| 2614 | }
|
|---|
| 2615 |
|
|---|
| 2616 |
|
|---|
| 2617 | /**
|
|---|
| 2618 | * Display the shadow gdt.
|
|---|
| 2619 | *
|
|---|
| 2620 | * @param pVM Pointer to the VM.
|
|---|
| 2621 | * @param pHlp The info helpers.
|
|---|
| 2622 | * @param pszArgs Arguments, ignored.
|
|---|
| 2623 | */
|
|---|
| 2624 | static DECLCALLBACK(void) selmR3InfoGdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
|
|---|
| 2625 | {
|
|---|
| 2626 | NOREF(pszArgs);
|
|---|
| 2627 | pHlp->pfnPrintf(pHlp, "Shadow GDT (GCAddr=%RRv):\n", MMHyperR3ToRC(pVM, pVM->selm.s.paGdtR3));
|
|---|
| 2628 | for (unsigned iGDT = 0; iGDT < SELM_GDT_ELEMENTS; iGDT++)
|
|---|
| 2629 | {
|
|---|
| 2630 | if (pVM->selm.s.paGdtR3[iGDT].Gen.u1Present)
|
|---|
| 2631 | {
|
|---|
| 2632 | char szOutput[128];
|
|---|
| 2633 | selmR3FormatDescriptor(pVM->selm.s.paGdtR3[iGDT], iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
|
|---|
| 2634 | const char *psz = "";
|
|---|
| 2635 | if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS] >> X86_SEL_SHIFT))
|
|---|
| 2636 | psz = " HyperCS";
|
|---|
| 2637 | else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_DS] >> X86_SEL_SHIFT))
|
|---|
| 2638 | psz = " HyperDS";
|
|---|
| 2639 | else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_CS64] >> X86_SEL_SHIFT))
|
|---|
| 2640 | psz = " HyperCS64";
|
|---|
| 2641 | else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS] >> X86_SEL_SHIFT))
|
|---|
| 2642 | psz = " HyperTSS";
|
|---|
| 2643 | else if (iGDT == ((unsigned)pVM->selm.s.aHyperSel[SELM_HYPER_SEL_TSS_TRAP08] >> X86_SEL_SHIFT))
|
|---|
| 2644 | psz = " HyperTSSTrap08";
|
|---|
| 2645 | pHlp->pfnPrintf(pHlp, "%s%s\n", szOutput, psz);
|
|---|
| 2646 | }
|
|---|
| 2647 | }
|
|---|
| 2648 | }
|
|---|
| 2649 |
|
|---|
| 2650 |
|
|---|
| 2651 | /**
|
|---|
| 2652 | * Display the guest gdt.
|
|---|
| 2653 | *
|
|---|
| 2654 | * @param pVM Pointer to the VM.
|
|---|
| 2655 | * @param pHlp The info helpers.
|
|---|
| 2656 | * @param pszArgs Arguments, ignored.
|
|---|
| 2657 | */
|
|---|
| 2658 | static DECLCALLBACK(void) selmR3InfoGdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
|
|---|
| 2659 | {
|
|---|
| 2660 | /** @todo SMP support! */
|
|---|
| 2661 | PVMCPU pVCpu = &pVM->aCpus[0];
|
|---|
| 2662 |
|
|---|
| 2663 | VBOXGDTR GDTR;
|
|---|
| 2664 | CPUMGetGuestGDTR(pVCpu, &GDTR);
|
|---|
| 2665 | RTGCPTR GCPtrGDT = GDTR.pGdt;
|
|---|
| 2666 | unsigned cGDTs = ((unsigned)GDTR.cbGdt + 1) / sizeof(X86DESC);
|
|---|
| 2667 |
|
|---|
| 2668 | pHlp->pfnPrintf(pHlp, "Guest GDT (GCAddr=%RGv limit=%x):\n", GCPtrGDT, GDTR.cbGdt);
|
|---|
| 2669 | for (unsigned iGDT = 0; iGDT < cGDTs; iGDT++, GCPtrGDT += sizeof(X86DESC))
|
|---|
| 2670 | {
|
|---|
| 2671 | X86DESC GDTE;
|
|---|
| 2672 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &GDTE, GCPtrGDT, sizeof(GDTE));
|
|---|
| 2673 | if (RT_SUCCESS(rc))
|
|---|
| 2674 | {
|
|---|
| 2675 | if (GDTE.Gen.u1Present)
|
|---|
| 2676 | {
|
|---|
| 2677 | char szOutput[128];
|
|---|
| 2678 | selmR3FormatDescriptor(GDTE, iGDT << X86_SEL_SHIFT, &szOutput[0], sizeof(szOutput));
|
|---|
| 2679 | pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
|
|---|
| 2680 | }
|
|---|
| 2681 | }
|
|---|
| 2682 | else if (rc == VERR_PAGE_NOT_PRESENT)
|
|---|
| 2683 | {
|
|---|
| 2684 | if ((GCPtrGDT & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
|
|---|
| 2685 | pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", iGDT << X86_SEL_SHIFT, GCPtrGDT);
|
|---|
| 2686 | }
|
|---|
| 2687 | else
|
|---|
| 2688 | pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", iGDT << X86_SEL_SHIFT, rc, GCPtrGDT);
|
|---|
| 2689 | }
|
|---|
| 2690 | NOREF(pszArgs);
|
|---|
| 2691 | }
|
|---|
| 2692 |
|
|---|
| 2693 |
|
|---|
| 2694 | /**
|
|---|
| 2695 | * Display the shadow ldt.
|
|---|
| 2696 | *
|
|---|
| 2697 | * @param pVM Pointer to the VM.
|
|---|
| 2698 | * @param pHlp The info helpers.
|
|---|
| 2699 | * @param pszArgs Arguments, ignored.
|
|---|
| 2700 | */
|
|---|
| 2701 | static DECLCALLBACK(void) selmR3InfoLdt(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
|
|---|
| 2702 | {
|
|---|
| 2703 | unsigned cLDTs = ((unsigned)pVM->selm.s.cbLdtLimit + 1) >> X86_SEL_SHIFT;
|
|---|
| 2704 | PX86DESC paLDT = (PX86DESC)((char *)pVM->selm.s.pvLdtR3 + pVM->selm.s.offLdtHyper);
|
|---|
| 2705 | pHlp->pfnPrintf(pHlp, "Shadow LDT (GCAddr=%RRv limit=%#x):\n", pVM->selm.s.pvLdtRC + pVM->selm.s.offLdtHyper, pVM->selm.s.cbLdtLimit);
|
|---|
| 2706 | for (unsigned iLDT = 0; iLDT < cLDTs; iLDT++)
|
|---|
| 2707 | {
|
|---|
| 2708 | if (paLDT[iLDT].Gen.u1Present)
|
|---|
| 2709 | {
|
|---|
| 2710 | char szOutput[128];
|
|---|
| 2711 | selmR3FormatDescriptor(paLDT[iLDT], (iLDT << X86_SEL_SHIFT) | X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
|
|---|
| 2712 | pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
|
|---|
| 2713 | }
|
|---|
| 2714 | }
|
|---|
| 2715 | NOREF(pszArgs);
|
|---|
| 2716 | }
|
|---|
| 2717 |
|
|---|
| 2718 |
|
|---|
| 2719 | /**
|
|---|
| 2720 | * Display the guest ldt.
|
|---|
| 2721 | *
|
|---|
| 2722 | * @param pVM Pointer to the VM.
|
|---|
| 2723 | * @param pHlp The info helpers.
|
|---|
| 2724 | * @param pszArgs Arguments, ignored.
|
|---|
| 2725 | */
|
|---|
| 2726 | static DECLCALLBACK(void) selmR3InfoLdtGuest(PVM pVM, PCDBGFINFOHLP pHlp, const char *pszArgs)
|
|---|
| 2727 | {
|
|---|
| 2728 | /** @todo SMP support! */
|
|---|
| 2729 | PVMCPU pVCpu = &pVM->aCpus[0];
|
|---|
| 2730 |
|
|---|
| 2731 | uint64_t GCPtrLdt;
|
|---|
| 2732 | uint32_t cbLdt;
|
|---|
| 2733 | RTSEL SelLdt = CPUMGetGuestLdtrEx(pVCpu, &GCPtrLdt, &cbLdt);
|
|---|
| 2734 | if (!(SelLdt & X86_SEL_MASK_OFF_RPL))
|
|---|
| 2735 | {
|
|---|
| 2736 | pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x): Null-Selector\n", SelLdt);
|
|---|
| 2737 | return;
|
|---|
| 2738 | }
|
|---|
| 2739 |
|
|---|
| 2740 | pHlp->pfnPrintf(pHlp, "Guest LDT (Sel=%x GCAddr=%RX64 limit=%x):\n", SelLdt, GCPtrLdt, cbLdt);
|
|---|
| 2741 | unsigned cLdts = (cbLdt + 1) >> X86_SEL_SHIFT;
|
|---|
| 2742 | for (unsigned iLdt = 0; iLdt < cLdts; iLdt++, GCPtrLdt += sizeof(X86DESC))
|
|---|
| 2743 | {
|
|---|
| 2744 | X86DESC LdtE;
|
|---|
| 2745 | int rc = PGMPhysSimpleReadGCPtr(pVCpu, &LdtE, GCPtrLdt, sizeof(LdtE));
|
|---|
| 2746 | if (RT_SUCCESS(rc))
|
|---|
| 2747 | {
|
|---|
| 2748 | if (LdtE.Gen.u1Present)
|
|---|
| 2749 | {
|
|---|
| 2750 | char szOutput[128];
|
|---|
| 2751 | selmR3FormatDescriptor(LdtE, (iLdt << X86_SEL_SHIFT) | X86_SEL_LDT, &szOutput[0], sizeof(szOutput));
|
|---|
| 2752 | pHlp->pfnPrintf(pHlp, "%s\n", szOutput);
|
|---|
| 2753 | }
|
|---|
| 2754 | }
|
|---|
| 2755 | else if (rc == VERR_PAGE_NOT_PRESENT)
|
|---|
| 2756 | {
|
|---|
| 2757 | if ((GCPtrLdt & PAGE_OFFSET_MASK) + sizeof(X86DESC) - 1 < sizeof(X86DESC))
|
|---|
| 2758 | pHlp->pfnPrintf(pHlp, "%04x - page not present (GCAddr=%RGv)\n", (iLdt << X86_SEL_SHIFT) | X86_SEL_LDT, GCPtrLdt);
|
|---|
| 2759 | }
|
|---|
| 2760 | else
|
|---|
| 2761 | pHlp->pfnPrintf(pHlp, "%04x - read error rc=%Rrc GCAddr=%RGv\n", (iLdt << X86_SEL_SHIFT) | X86_SEL_LDT, rc, GCPtrLdt);
|
|---|
| 2762 | }
|
|---|
| 2763 | NOREF(pszArgs);
|
|---|
| 2764 | }
|
|---|
| 2765 |
|
|---|
| 2766 |
|
|---|
| 2767 | /**
|
|---|
| 2768 | * Dumps the hypervisor GDT
|
|---|
| 2769 | *
|
|---|
| 2770 | * @param pVM Pointer to the VM.
|
|---|
| 2771 | */
|
|---|
| 2772 | VMMR3DECL(void) SELMR3DumpHyperGDT(PVM pVM)
|
|---|
| 2773 | {
|
|---|
| 2774 | DBGFR3Info(pVM->pUVM, "gdt", NULL, NULL);
|
|---|
| 2775 | }
|
|---|
| 2776 |
|
|---|
| 2777 |
|
|---|
| 2778 | /**
|
|---|
| 2779 | * Dumps the hypervisor LDT
|
|---|
| 2780 | *
|
|---|
| 2781 | * @param pVM Pointer to the VM.
|
|---|
| 2782 | */
|
|---|
| 2783 | VMMR3DECL(void) SELMR3DumpHyperLDT(PVM pVM)
|
|---|
| 2784 | {
|
|---|
| 2785 | DBGFR3Info(pVM->pUVM, "ldt", NULL, NULL);
|
|---|
| 2786 | }
|
|---|
| 2787 |
|
|---|
| 2788 |
|
|---|
| 2789 | /**
|
|---|
| 2790 | * Dumps the guest GDT
|
|---|
| 2791 | *
|
|---|
| 2792 | * @param pVM Pointer to the VM.
|
|---|
| 2793 | */
|
|---|
| 2794 | VMMR3DECL(void) SELMR3DumpGuestGDT(PVM pVM)
|
|---|
| 2795 | {
|
|---|
| 2796 | DBGFR3Info(pVM->pUVM, "gdtguest", NULL, NULL);
|
|---|
| 2797 | }
|
|---|
| 2798 |
|
|---|
| 2799 |
|
|---|
| 2800 | /**
|
|---|
| 2801 | * Dumps the guest LDT
|
|---|
| 2802 | *
|
|---|
| 2803 | * @param pVM Pointer to the VM.
|
|---|
| 2804 | */
|
|---|
| 2805 | VMMR3DECL(void) SELMR3DumpGuestLDT(PVM pVM)
|
|---|
| 2806 | {
|
|---|
| 2807 | DBGFR3Info(pVM->pUVM, "ldtguest", NULL, NULL);
|
|---|
| 2808 | }
|
|---|
| 2809 |
|
|---|
