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/* $Id: GIMR0Hv.cpp $ */
/** @file
* Guest Interface Manager (GIM), Hyper-V - Host Context Ring-0.
*/
/*
* Copyright (C) 2014-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* SPDX-License-Identifier: GPL-3.0-only
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP LOG_GROUP_GIM
#include <VBox/vmm/gim.h>
#include <VBox/vmm/tm.h>
#include "GIMInternal.h"
#include "GIMHvInternal.h"
#include <VBox/vmm/vmcc.h>
#include <VBox/err.h>
#include <iprt/spinlock.h>
#if 0
/**
* Allocates and maps one physically contiguous page. The allocated page is
* zero'd out.
*
* @returns IPRT status code.
* @param pMemObj Pointer to the ring-0 memory object.
* @param ppVirt Where to store the virtual address of the
* allocation.
* @param pPhys Where to store the physical address of the
* allocation.
*/
static int gimR0HvPageAllocZ(PRTR0MEMOBJ pMemObj, PRTR0PTR ppVirt, PRTHCPHYS pHCPhys)
{
AssertPtr(pMemObj);
AssertPtr(ppVirt);
AssertPtr(pHCPhys);
int rc = RTR0MemObjAllocCont(pMemObj, HOST_PAGE_SIZE, false /* fExecutable */);
if (RT_FAILURE(rc))
return rc;
*ppVirt = RTR0MemObjAddress(*pMemObj);
*pHCPhys = RTR0MemObjGetPagePhysAddr(*pMemObj, 0 /* iPage */);
ASMMemZero32(*ppVirt, HOST_PAGE_SIZE);
return VINF_SUCCESS;
}
/**
* Frees and unmaps an allocated physical page.
*
* @param pMemObj Pointer to the ring-0 memory object.
* @param ppVirt Where to re-initialize the virtual address of
* allocation as 0.
* @param pHCPhys Where to re-initialize the physical address of the
* allocation as 0.
*/
static void gimR0HvPageFree(PRTR0MEMOBJ pMemObj, PRTR0PTR ppVirt, PRTHCPHYS pHCPhys)
{
AssertPtr(pMemObj);
AssertPtr(ppVirt);
AssertPtr(pHCPhys);
if (*pMemObj != NIL_RTR0MEMOBJ)
{
int rc = RTR0MemObjFree(*pMemObj, true /* fFreeMappings */);
AssertRC(rc);
*pMemObj = NIL_RTR0MEMOBJ;
*ppVirt = 0;
*pHCPhys = 0;
}
}
#endif
/**
* Updates Hyper-V's reference TSC page.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
* @param u64Offset The computed TSC offset.
* @thread EMT.
*/
VMM_INT_DECL(int) gimR0HvUpdateParavirtTsc(PVMCC pVM, uint64_t u64Offset)
{
Assert(GIMIsEnabled(pVM));
bool fHvTscEnabled = MSR_GIM_HV_REF_TSC_IS_ENABLED(pVM->gim.s.u.Hv.u64TscPageMsr);
if (RT_UNLIKELY(!fHvTscEnabled))
return VERR_GIM_PVTSC_NOT_ENABLED;
/** @todo this is buggy when large pages are used due to a PGM limitation, see
* @bugref{7532}.
*
* In any case, we do not ever update this page while the guest is
* running after setting it up (in ring-3, see gimR3HvEnableTscPage()) as
* the TSC offset is handled in the VMCS/VMCB (HM) or by trapping RDTSC
* (raw-mode). */
#if 0
PCGIMHV pcHv = &pVM->gim.s.u.Hv;
PCGIMMMIO2REGION pcRegion = &pcHv->aMmio2Regions[GIM_HV_REF_TSC_PAGE_REGION_IDX];
PGIMHVREFTSC pRefTsc = (PGIMHVREFTSC)pcRegion->CTX_SUFF(pvPage);
Assert(pRefTsc);
/*
* Hyper-V reports the reference time in 100 nanosecond units.
*/
uint64_t u64Tsc100Ns = pcHv->cTscTicksPerSecond / RT_NS_10MS;
int64_t i64TscOffset = (int64_t)u64Offset / u64Tsc100Ns;
/*
* The TSC page can be simulatenously read by other VCPUs in the guest. The
* spinlock is only for protecting simultaneous hypervisor writes from other
* EMTs.
*/
RTSpinlockAcquire(pcHv->hSpinlockR0);
if (pRefTsc->i64TscOffset != i64TscOffset)
{
if (pRefTsc->u32TscSequence < UINT32_C(0xfffffffe))
ASMAtomicIncU32(&pRefTsc->u32TscSequence);
else
ASMAtomicWriteU32(&pRefTsc->u32TscSequence, 1);
ASMAtomicWriteS64(&pRefTsc->i64TscOffset, i64TscOffset);
}
RTSpinlockRelease(pcHv->hSpinlockR0);
Assert(pRefTsc->u32TscSequence != 0);
Assert(pRefTsc->u32TscSequence != UINT32_C(0xffffffff));
#else
NOREF(u64Offset);
#endif
return VINF_SUCCESS;
}
/**
* Does ring-0 per-VM GIM Hyper-V initialization.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
*/
VMMR0_INT_DECL(int) gimR0HvInitVM(PVMCC pVM)
{
AssertPtr(pVM);
Assert(GIMIsEnabled(pVM));
PGIMHV pHv = &pVM->gim.s.u.Hv;
Assert(pHv->hSpinlockR0 == NIL_RTSPINLOCK);
int rc = RTSpinlockCreate(&pHv->hSpinlockR0, RTSPINLOCK_FLAGS_INTERRUPT_UNSAFE, "Hyper-V");
return rc;
}
/**
* Does ring-0 per-VM GIM Hyper-V termination.
*
* @returns VBox status code.
* @param pVM The cross context VM structure.
*/
VMMR0_INT_DECL(int) gimR0HvTermVM(PVMCC pVM)
{
AssertPtr(pVM);
Assert(GIMIsEnabled(pVM));
PGIMHV pHv = &pVM->gim.s.u.Hv;
RTSpinlockDestroy(pHv->hSpinlockR0);
pHv->hSpinlockR0 = NIL_RTSPINLOCK;
return VINF_SUCCESS;
}
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