| 1 | /* $Id: GIMR0Hv.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Guest Interface Manager (GIM), Hyper-V - Host Context Ring-0.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2014-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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| 26 | */
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| 27 |
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| 28 |
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| 29 | /*********************************************************************************************************************************
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| 30 | * Header Files *
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| 31 | *********************************************************************************************************************************/
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| 32 | #define LOG_GROUP LOG_GROUP_GIM
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| 33 | #include <VBox/vmm/gim.h>
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| 34 | #include <VBox/vmm/tm.h>
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| 35 | #include "GIMInternal.h"
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| 36 | #include "GIMHvInternal.h"
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| 37 | #include <VBox/vmm/vmcc.h>
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| 38 |
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| 39 | #include <VBox/err.h>
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| 40 |
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| 41 | #include <iprt/spinlock.h>
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| 42 |
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| 43 |
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| 44 | #if 0
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| 45 | /**
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| 46 | * Allocates and maps one physically contiguous page. The allocated page is
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| 47 | * zero'd out.
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| 48 | *
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| 49 | * @returns IPRT status code.
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| 50 | * @param pMemObj Pointer to the ring-0 memory object.
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| 51 | * @param ppVirt Where to store the virtual address of the
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| 52 | * allocation.
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| 53 | * @param pPhys Where to store the physical address of the
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| 54 | * allocation.
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| 55 | */
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| 56 | static int gimR0HvPageAllocZ(PRTR0MEMOBJ pMemObj, PRTR0PTR ppVirt, PRTHCPHYS pHCPhys)
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| 57 | {
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| 58 | AssertPtr(pMemObj);
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| 59 | AssertPtr(ppVirt);
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| 60 | AssertPtr(pHCPhys);
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| 61 |
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| 62 | int rc = RTR0MemObjAllocCont(pMemObj, HOST_PAGE_SIZE, false /* fExecutable */);
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| 63 | if (RT_FAILURE(rc))
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| 64 | return rc;
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| 65 | *ppVirt = RTR0MemObjAddress(*pMemObj);
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| 66 | *pHCPhys = RTR0MemObjGetPagePhysAddr(*pMemObj, 0 /* iPage */);
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| 67 | ASMMemZero32(*ppVirt, HOST_PAGE_SIZE);
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| 68 | return VINF_SUCCESS;
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| 69 | }
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| 70 |
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| 71 |
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| 72 | /**
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| 73 | * Frees and unmaps an allocated physical page.
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| 74 | *
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| 75 | * @param pMemObj Pointer to the ring-0 memory object.
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| 76 | * @param ppVirt Where to re-initialize the virtual address of
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| 77 | * allocation as 0.
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| 78 | * @param pHCPhys Where to re-initialize the physical address of the
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| 79 | * allocation as 0.
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| 80 | */
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| 81 | static void gimR0HvPageFree(PRTR0MEMOBJ pMemObj, PRTR0PTR ppVirt, PRTHCPHYS pHCPhys)
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| 82 | {
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| 83 | AssertPtr(pMemObj);
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| 84 | AssertPtr(ppVirt);
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| 85 | AssertPtr(pHCPhys);
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| 86 | if (*pMemObj != NIL_RTR0MEMOBJ)
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| 87 | {
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| 88 | int rc = RTR0MemObjFree(*pMemObj, true /* fFreeMappings */);
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| 89 | AssertRC(rc);
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| 90 | *pMemObj = NIL_RTR0MEMOBJ;
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| 91 | *ppVirt = 0;
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| 92 | *pHCPhys = 0;
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| 93 | }
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| 94 | }
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| 95 | #endif
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| 96 |
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| 97 | /**
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| 98 | * Updates Hyper-V's reference TSC page.
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| 99 | *
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| 100 | * @returns VBox status code.
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| 101 | * @param pVM The cross context VM structure.
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| 102 | * @param u64Offset The computed TSC offset.
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| 103 | * @thread EMT.
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| 104 | */
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| 105 | VMM_INT_DECL(int) gimR0HvUpdateParavirtTsc(PVMCC pVM, uint64_t u64Offset)
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| 106 | {
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| 107 | Assert(GIMIsEnabled(pVM));
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| 108 | bool fHvTscEnabled = MSR_GIM_HV_REF_TSC_IS_ENABLED(pVM->gim.s.u.Hv.u64TscPageMsr);
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| 109 | if (RT_UNLIKELY(!fHvTscEnabled))
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| 110 | return VERR_GIM_PVTSC_NOT_ENABLED;
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| 111 |
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| 112 | /** @todo this is buggy when large pages are used due to a PGM limitation, see
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| 113 | * @bugref{7532}.
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| 114 | *
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| 115 | * In any case, we do not ever update this page while the guest is
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| 116 | * running after setting it up (in ring-3, see gimR3HvEnableTscPage()) as
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| 117 | * the TSC offset is handled in the VMCS/VMCB (HM) or by trapping RDTSC
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| 118 | * (raw-mode). */
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| 119 | #if 0
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| 120 | PCGIMHV pcHv = &pVM->gim.s.u.Hv;
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| 121 | PCGIMMMIO2REGION pcRegion = &pcHv->aMmio2Regions[GIM_HV_REF_TSC_PAGE_REGION_IDX];
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| 122 | PGIMHVREFTSC pRefTsc = (PGIMHVREFTSC)pcRegion->CTX_SUFF(pvPage);
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| 123 | Assert(pRefTsc);
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| 124 |
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| 125 | /*
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| 126 | * Hyper-V reports the reference time in 100 nanosecond units.
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| 127 | */
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| 128 | uint64_t u64Tsc100Ns = pcHv->cTscTicksPerSecond / RT_NS_10MS;
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| 129 | int64_t i64TscOffset = (int64_t)u64Offset / u64Tsc100Ns;
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| 130 |
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| 131 | /*
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| 132 | * The TSC page can be simulatenously read by other VCPUs in the guest. The
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| 133 | * spinlock is only for protecting simultaneous hypervisor writes from other
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| 134 | * EMTs.
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| 135 | */
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| 136 | RTSpinlockAcquire(pcHv->hSpinlockR0);
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| 137 | if (pRefTsc->i64TscOffset != i64TscOffset)
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| 138 | {
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| 139 | if (pRefTsc->u32TscSequence < UINT32_C(0xfffffffe))
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| 140 | ASMAtomicIncU32(&pRefTsc->u32TscSequence);
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| 141 | else
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| 142 | ASMAtomicWriteU32(&pRefTsc->u32TscSequence, 1);
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| 143 | ASMAtomicWriteS64(&pRefTsc->i64TscOffset, i64TscOffset);
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| 144 | }
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| 145 | RTSpinlockRelease(pcHv->hSpinlockR0);
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| 146 |
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| 147 | Assert(pRefTsc->u32TscSequence != 0);
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| 148 | Assert(pRefTsc->u32TscSequence != UINT32_C(0xffffffff));
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| 149 | #else
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| 150 | NOREF(u64Offset);
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| 151 | #endif
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| 152 | return VINF_SUCCESS;
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| 153 | }
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| 154 |
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| 155 |
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| 156 | /**
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| 157 | * Does ring-0 per-VM GIM Hyper-V initialization.
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| 158 | *
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| 159 | * @returns VBox status code.
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| 160 | * @param pVM The cross context VM structure.
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| 161 | */
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| 162 | VMMR0_INT_DECL(int) gimR0HvInitVM(PVMCC pVM)
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| 163 | {
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| 164 | AssertPtr(pVM);
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| 165 | Assert(GIMIsEnabled(pVM));
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| 166 |
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| 167 | PGIMHV pHv = &pVM->gim.s.u.Hv;
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| 168 | Assert(pHv->hSpinlockR0 == NIL_RTSPINLOCK);
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| 169 |
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| 170 | int rc = RTSpinlockCreate(&pHv->hSpinlockR0, RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, "Hyper-V");
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| 171 | return rc;
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| 172 | }
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| 173 |
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| 174 |
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| 175 | /**
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| 176 | * Does ring-0 per-VM GIM Hyper-V termination.
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| 177 | *
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| 178 | * @returns VBox status code.
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| 179 | * @param pVM The cross context VM structure.
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| 180 | */
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| 181 | VMMR0_INT_DECL(int) gimR0HvTermVM(PVMCC pVM)
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| 182 | {
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| 183 | AssertPtr(pVM);
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| 184 | Assert(GIMIsEnabled(pVM));
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| 185 |
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| 186 | PGIMHV pHv = &pVM->gim.s.u.Hv;
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| 187 | RTSpinlockDestroy(pHv->hSpinlockR0);
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| 188 | pHv->hSpinlockR0 = NIL_RTSPINLOCK;
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| 189 |
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| 190 | return VINF_SUCCESS;
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| 191 | }
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| 192 |
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