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/* $Id: GIMR0Kvm.cpp $ */
/** @file
* Guest Interface Manager (GIM), KVM - Host Context Ring-0.
*/
/*
* Copyright (C) 2015-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_GIM
#include <VBox/vmm/gim.h>
#include <VBox/vmm/tm.h>
#include "GIMInternal.h"
#include "GIMKvmInternal.h"
#include <VBox/vmm/vm.h>
#include <VBox/err.h>
#include <iprt/spinlock.h>
/**
* Updates KVM's system time information globally for all VCPUs.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
* @param pVCpu The cross context virtual CPU structure.
* @thread EMT.
* @remarks Can be called with preemption disabled!
*/
VMM_INT_DECL(int) gimR0KvmUpdateSystemTime(PVM pVM, PVMCPU pVCpu)
{
/*
* Validate.
*/
Assert(GIMIsEnabled(pVM));
PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
AssertReturn(pKvm->hSpinlockR0 != NIL_RTSPINLOCK, VERR_GIM_IPE_3);
/*
* Record the TSC and virtual NanoTS pairs.
*/
uint64_t uTsc;
uint64_t uVirtNanoTS;
RTCCUINTREG fEFlags = ASMIntDisableFlags();
uTsc = TMCpuTickGetNoCheck(pVCpu) | UINT64_C(1);
uVirtNanoTS = TMVirtualGetNoCheck(pVM) | UINT64_C(1);
ASMSetFlags(fEFlags);
/*
* Update VCPUs with this information. The first VCPU's values
* will be applied to the remaining.
*/
RTSpinlockAcquire(pKvm->hSpinlockR0);
for (uint32_t i = 0; i < pVM->cCpus; i++)
{
PGIMKVMCPU pKvmCpu = &pVM->aCpus[i].gim.s.u.KvmCpu;
if ( !pKvmCpu->uTsc
&& !pKvmCpu->uVirtNanoTS)
{
pKvmCpu->uTsc = uTsc;
pKvmCpu->uVirtNanoTS = uVirtNanoTS;
}
}
RTSpinlockRelease(pKvm->hSpinlockR0);
return VINF_SUCCESS;
}
/**
* Does ring-0 per-VM GIM KVM initialization.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
*/
VMMR0_INT_DECL(int) gimR0KvmInitVM(PVM pVM)
{
AssertPtr(pVM);
Assert(GIMIsEnabled(pVM));
PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
Assert(pKvm->hSpinlockR0 == NIL_RTSPINLOCK);
int rc = RTSpinlockCreate(&pKvm->hSpinlockR0, RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, "KVM");
return rc;
}
/**
* Does ring-0 per-VM GIM KVM termination.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
*/
VMMR0_INT_DECL(int) gimR0KvmTermVM(PVM pVM)
{
AssertPtr(pVM);
Assert(GIMIsEnabled(pVM));
PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
RTSpinlockDestroy(pKvm->hSpinlockR0);
pKvm->hSpinlockR0 = NIL_RTSPINLOCK;
return VINF_SUCCESS;
}
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