| 1 | /* $Id: GIMR0Kvm.cpp 80333 2019-08-16 20:28:38Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Guest Interface Manager (GIM), KVM - 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) 2015-2019 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 |
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| 19 | /*********************************************************************************************************************************
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| 20 | * Header Files *
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| 21 | *********************************************************************************************************************************/
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| 22 | #define LOG_GROUP LOG_GROUP_GIM
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| 23 | #include <VBox/vmm/gim.h>
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| 24 | #include <VBox/vmm/tm.h>
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| 25 | #include "GIMInternal.h"
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| 26 | #include "GIMKvmInternal.h"
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| 27 | #include <VBox/vmm/vmcc.h>
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| 28 |
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| 29 | #include <VBox/err.h>
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| 30 |
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| 31 | #include <iprt/spinlock.h>
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| 32 |
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| 33 |
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| 34 | /**
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| 35 | * Updates KVM's system time information globally for all VCPUs.
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| 36 | *
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| 37 | * @returns VBox status code.
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| 38 | * @param pVM The cross context VM structure.
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| 39 | * @param pVCpu The cross context virtual CPU structure.
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| 40 | * @thread EMT.
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| 41 | * @remarks Can be called with preemption disabled!
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| 42 | */
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| 43 | VMM_INT_DECL(int) gimR0KvmUpdateSystemTime(PVMCC pVM, PVMCPUCC pVCpu)
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| 44 | {
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| 45 | /*
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| 46 | * Validate.
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| 47 | */
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| 48 | Assert(GIMIsEnabled(pVM));
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| 49 | PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
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| 50 | AssertReturn(pKvm->hSpinlockR0 != NIL_RTSPINLOCK, VERR_GIM_IPE_3);
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| 51 |
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| 52 | /*
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| 53 | * Record the TSC and virtual NanoTS pairs.
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| 54 | */
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| 55 | uint64_t uTsc;
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| 56 | uint64_t uVirtNanoTS;
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| 57 | RTCCUINTREG fEFlags = ASMIntDisableFlags();
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| 58 | uTsc = TMCpuTickGetNoCheck(pVCpu) | UINT64_C(1);
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| 59 | uVirtNanoTS = TMVirtualGetNoCheck(pVM) | UINT64_C(1);
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| 60 | ASMSetFlags(fEFlags);
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| 61 |
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| 62 | /*
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| 63 | * Update VCPUs with this information. The first VCPU's values
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| 64 | * will be applied to the remaining.
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| 65 | */
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| 66 | RTSpinlockAcquire(pKvm->hSpinlockR0);
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| 67 | for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
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| 68 | {
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| 69 | PGIMKVMCPU pKvmCpu = &VMCC_GET_CPU(pVM, idCpu)->gim.s.u.KvmCpu;
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| 70 | if ( !pKvmCpu->uTsc
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| 71 | && !pKvmCpu->uVirtNanoTS)
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| 72 | {
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| 73 | pKvmCpu->uTsc = uTsc;
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| 74 | pKvmCpu->uVirtNanoTS = uVirtNanoTS;
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| 75 | }
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| 76 | }
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| 77 | RTSpinlockRelease(pKvm->hSpinlockR0);
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| 78 |
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| 79 | return VINF_SUCCESS;
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| 80 | }
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| 81 |
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| 82 |
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| 83 | /**
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| 84 | * Does ring-0 per-VM GIM KVM initialization.
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| 85 | *
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| 86 | * @returns VBox status code.
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| 87 | * @param pVM The cross context VM structure.
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| 88 | */
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| 89 | VMMR0_INT_DECL(int) gimR0KvmInitVM(PVMCC pVM)
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| 90 | {
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| 91 | AssertPtr(pVM);
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| 92 | Assert(GIMIsEnabled(pVM));
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| 93 |
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| 94 | PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
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| 95 | Assert(pKvm->hSpinlockR0 == NIL_RTSPINLOCK);
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| 96 |
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| 97 | int rc = RTSpinlockCreate(&pKvm->hSpinlockR0, RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, "KVM");
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| 98 | return rc;
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| 99 | }
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| 100 |
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| 101 |
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| 102 | /**
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| 103 | * Does ring-0 per-VM GIM KVM termination.
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| 104 | *
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| 105 | * @returns VBox status code.
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| 106 | * @param pVM The cross context VM structure.
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| 107 | */
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| 108 | VMMR0_INT_DECL(int) gimR0KvmTermVM(PVMCC pVM)
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| 109 | {
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| 110 | AssertPtr(pVM);
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| 111 | Assert(GIMIsEnabled(pVM));
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| 112 |
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| 113 | PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
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| 114 | RTSpinlockDestroy(pKvm->hSpinlockR0);
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| 115 | pKvm->hSpinlockR0 = NIL_RTSPINLOCK;
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| 116 |
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| 117 | return VINF_SUCCESS;
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| 118 | }
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| 119 |
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