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/* $Id: PGMR0SharedPage.cpp $ */
/** @file
* PGM - Page Manager and Monitor, Page Sharing, Ring-0.
*/
/*
* Copyright (C) 2010-2023 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_PGM_SHARED
#define VBOX_WITHOUT_PAGING_BIT_FIELDS /* 64-bit bitfields are just asking for trouble. See @bugref{9841} and others. */
#include <VBox/vmm/pgm.h>
#include <VBox/vmm/iem.h>
#include <VBox/vmm/gmm.h>
#include "PGMInternal.h"
#include <VBox/vmm/vmcc.h>
#include <VBox/vmm/gvm.h>
#include "PGMInline.h"
#include <VBox/log.h>
#include <VBox/err.h>
#include <iprt/assert.h>
#include <iprt/mem.h>
#ifdef VBOX_WITH_PAGE_SHARING
/**
* Check a registered module for shared page changes.
*
* The PGM lock shall be taken prior to calling this method.
*
* @returns The following VBox status codes.
*
* @param pVM The cross context VM structure.
* @param pGVM Pointer to the GVM instance data.
* @param idCpu The ID of the calling virtual CPU.
* @param pModule Global module description.
* @param paRegionsGCPtrs Array parallel to pModules->aRegions with the
* addresses of the regions in the calling
* process.
*/
VMMR0DECL(int) PGMR0SharedModuleCheck(PVMCC pVM, PGVM pGVM, VMCPUID idCpu, PGMMSHAREDMODULE pModule, PCRTGCPTR64 paRegionsGCPtrs)
{
PVMCPUCC pVCpu = &pGVM->aCpus[idCpu];
int rc = VINF_SUCCESS;
bool fFlushTLBs = false;
bool fFlushRemTLBs = false;
GMMSHAREDPAGEDESC PageDesc;
Log(("PGMR0SharedModuleCheck: check %s %s base=%RGv size=%x\n", pModule->szName, pModule->szVersion, pModule->Core.Key, pModule->cbModule));
PGM_LOCK_ASSERT_OWNER(pVM); /* This cannot fail as we grab the lock in pgmR3SharedModuleRegRendezvous before calling into ring-0. */
/*
* Check every region of the shared module.
*/
for (uint32_t idxRegion = 0; idxRegion < pModule->cRegions; idxRegion++)
{
RTGCPTR GCPtrPage = paRegionsGCPtrs[idxRegion] & ~(RTGCPTR)GUEST_PAGE_OFFSET_MASK;
uint32_t cbLeft = pModule->aRegions[idxRegion].cb; Assert(!(cbLeft & GUEST_PAGE_OFFSET_MASK));
uint32_t idxPage = 0;
while (cbLeft)
{
/** @todo inefficient to fetch each guest page like this... */
PGMPTWALK Walk;
rc = PGMGstGetPage(pVCpu, GCPtrPage, &Walk);
if ( rc == VINF_SUCCESS
&& !(Walk.fEffective & X86_PTE_RW)) /* important as we make assumptions about this below! */
{
PPGMPAGE pPage = pgmPhysGetPage(pVM, Walk.GCPhys);
Assert(!pPage || !PGM_PAGE_IS_BALLOONED(pPage));
if ( pPage
&& PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED
&& PGM_PAGE_GET_READ_LOCKS(pPage) == 0
&& PGM_PAGE_GET_WRITE_LOCKS(pPage) == 0 )
{
PageDesc.idPage = PGM_PAGE_GET_PAGEID(pPage);
PageDesc.HCPhys = PGM_PAGE_GET_HCPHYS(pPage);
PageDesc.GCPhys = Walk.GCPhys;
rc = GMMR0SharedModuleCheckPage(pGVM, pModule, idxRegion, idxPage, &PageDesc);
if (RT_FAILURE(rc))
break;
/*
* Any change for this page?
*/
if (PageDesc.idPage != NIL_GMM_PAGEID)
{
Assert(PGM_PAGE_GET_STATE(pPage) == PGM_PAGE_STATE_ALLOCATED);
Log(("PGMR0SharedModuleCheck: shared page gst virt=%RGv phys=%RGp host %RHp->%RHp\n",
GCPtrPage, PageDesc.GCPhys, PGM_PAGE_GET_HCPHYS(pPage), PageDesc.HCPhys));
/* Page was either replaced by an existing shared
version of it or converted into a read-only shared
page, so, clear all references. */
bool fFlush = false;
rc = pgmPoolTrackUpdateGCPhys(pVM, PageDesc.GCPhys, pPage, true /* clear the entries */, &fFlush);
Assert( rc == VINF_SUCCESS
|| ( VMCPU_FF_IS_SET(pVCpu, VMCPU_FF_PGM_SYNC_CR3)
&& (pVCpu->pgm.s.fSyncFlags & PGM_SYNC_CLEAR_PGM_POOL)));
if (rc == VINF_SUCCESS)
fFlushTLBs |= fFlush;
fFlushRemTLBs = true;
if (PageDesc.HCPhys != PGM_PAGE_GET_HCPHYS(pPage))
{
/* Update the physical address and page id now. */
PGM_PAGE_SET_HCPHYS(pVM, pPage, PageDesc.HCPhys);
PGM_PAGE_SET_PAGEID(pVM, pPage, PageDesc.idPage);
/* Invalidate page map TLB entry for this page too. */
pgmPhysInvalidatePageMapTLBEntry(pVM, PageDesc.GCPhys);
IEMTlbInvalidateAllPhysicalAllCpus(pVM, NIL_VMCPUID);
pVM->pgm.s.cReusedSharedPages++;
}
/* else: nothing changed (== this page is now a shared
page), so no need to flush anything. */
pVM->pgm.s.cSharedPages++;
pVM->pgm.s.cPrivatePages--;
PGM_PAGE_SET_STATE(pVM, pPage, PGM_PAGE_STATE_SHARED);
# ifdef VBOX_STRICT /* check sum hack */
pPage->s.u2Unused0 = PageDesc.u32StrictChecksum & 3;
//pPage->s.u2Unused1 = (PageDesc.u32StrictChecksum >> 8) & 3;
# endif
}
}
}
else
{
Assert( rc == VINF_SUCCESS
|| rc == VERR_PAGE_NOT_PRESENT
|| rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
|| rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
|| rc == VERR_PAGE_TABLE_NOT_PRESENT);
rc = VINF_SUCCESS; /* ignore error */
}
idxPage++;
GCPtrPage += HOST_PAGE_SIZE;
cbLeft -= HOST_PAGE_SIZE;
}
}
/*
* Do TLB flushing if necessary.
*/
if (fFlushTLBs)
PGM_INVL_ALL_VCPU_TLBS(pVM);
if (fFlushRemTLBs)
for (VMCPUID idCurCpu = 0; idCurCpu < pGVM->cCpus; idCurCpu++)
CPUMSetChangedFlags(&pGVM->aCpus[idCurCpu], CPUM_CHANGED_GLOBAL_TLB_FLUSH);
return rc;
}
#endif /* VBOX_WITH_PAGE_SHARING */
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