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/* $Id: PGMR0.cpp $ */
/** @file
* PGM - Page Manager and Monitor, Ring-0.
*/
/*
* Copyright (C) 2007 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_PGM
#include <VBox/pgm.h>
#include <VBox/gmm.h>
#include "../PGMInternal.h"
#include <VBox/vm.h>
#include "../PGMInline.h"
#include <VBox/log.h>
#include <VBox/err.h>
#include <iprt/assert.h>
#include <iprt/mem.h>
RT_C_DECLS_BEGIN
#define PGM_BTH_NAME(name) PGM_BTH_NAME_32BIT_PROT(name)
#include "PGMR0Bth.h"
#undef PGM_BTH_NAME
#define PGM_BTH_NAME(name) PGM_BTH_NAME_PAE_PROT(name)
#include "PGMR0Bth.h"
#undef PGM_BTH_NAME
#define PGM_BTH_NAME(name) PGM_BTH_NAME_AMD64_PROT(name)
#include "PGMR0Bth.h"
#undef PGM_BTH_NAME
#define PGM_BTH_NAME(name) PGM_BTH_NAME_EPT_PROT(name)
#include "PGMR0Bth.h"
#undef PGM_BTH_NAME
RT_C_DECLS_END
/**
* Worker function for PGMR3PhysAllocateHandyPages and pgmPhysEnsureHandyPage.
*
* @returns The following VBox status codes.
* @retval VINF_SUCCESS on success. FF cleared.
* @retval VINF_EM_NO_MEMORY if we're out of memory. The FF is set in this case.
*
* @param pVM The VM handle.
* @param pVCpu The VMCPU handle.
*
* @remarks Must be called from within the PGM critical section. The caller
* must clear the new pages.
*/
VMMR0DECL(int) PGMR0PhysAllocateHandyPages(PVM pVM, PVMCPU pVCpu)
{
Assert(PDMCritSectIsOwnerEx(&pVM->pgm.s.CritSect, pVCpu->idCpu));
/*
* Check for error injection.
*/
if (RT_UNLIKELY(pVM->pgm.s.fErrInjHandyPages))
return VERR_NO_MEMORY;
/*
* Try allocate a full set of handy pages.
*/
uint32_t iFirst = pVM->pgm.s.cHandyPages;
AssertReturn(iFirst <= RT_ELEMENTS(pVM->pgm.s.aHandyPages), VERR_INTERNAL_ERROR);
uint32_t cPages = RT_ELEMENTS(pVM->pgm.s.aHandyPages) - iFirst;
if (!cPages)
return VINF_SUCCESS;
int rc = GMMR0AllocateHandyPages(pVM, pVCpu->idCpu, cPages, cPages, &pVM->pgm.s.aHandyPages[iFirst]);
if (RT_SUCCESS(rc))
{
for (uint32_t i = 0; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
{
Assert(pVM->pgm.s.aHandyPages[i].idPage != NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].idPage <= GMM_PAGEID_LAST);
Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys != NIL_RTHCPHYS);
Assert(!(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
}
pVM->pgm.s.cHandyPages = RT_ELEMENTS(pVM->pgm.s.aHandyPages);
}
else if (rc != VERR_GMM_SEED_ME)
{
if ( ( rc == VERR_GMM_HIT_GLOBAL_LIMIT
|| rc == VERR_GMM_HIT_VM_ACCOUNT_LIMIT)
&& iFirst < PGM_HANDY_PAGES_MIN)
{
#ifdef VBOX_STRICT
/* We're ASSUMING that GMM has updated all the entires before failing us. */
uint32_t i;
for (i = iFirst; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
{
Assert(pVM->pgm.s.aHandyPages[i].idPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys == NIL_RTHCPHYS);
}
#endif
/*
* Reduce the number of pages until we hit the minimum limit.
*/
do
{
cPages >>= 2;
if (cPages + iFirst < PGM_HANDY_PAGES_MIN)
cPages = PGM_HANDY_PAGES_MIN - iFirst;
rc = GMMR0AllocateHandyPages(pVM, pVCpu->idCpu, cPages, cPages, &pVM->pgm.s.aHandyPages[iFirst]);
} while ( ( rc == VERR_GMM_HIT_GLOBAL_LIMIT
|| rc == VERR_GMM_HIT_VM_ACCOUNT_LIMIT)
&& cPages + iFirst > PGM_HANDY_PAGES_MIN);
if (RT_SUCCESS(rc))
{
#ifdef VBOX_STRICT
i = iFirst + cPages;
while (i-- > 0)
{
Assert(pVM->pgm.s.aHandyPages[i].idPage != NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].idPage <= GMM_PAGEID_LAST);
Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys != NIL_RTHCPHYS);
Assert(!(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys & ~X86_PTE_PAE_PG_MASK));
}
for (i = cPages + iFirst; i < RT_ELEMENTS(pVM->pgm.s.aHandyPages); i++)
{
Assert(pVM->pgm.s.aHandyPages[i].idPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].idSharedPage == NIL_GMM_PAGEID);
Assert(pVM->pgm.s.aHandyPages[i].HCPhysGCPhys == NIL_RTHCPHYS);
}
#endif
pVM->pgm.s.cHandyPages = iFirst + cPages;
}
}
if (RT_FAILURE(rc) && rc != VERR_GMM_SEED_ME)
{
LogRel(("PGMR0PhysAllocateHandyPages: rc=%Rrc iFirst=%d cPages=%d\n", rc, iFirst, cPages));
VM_FF_SET(pVM, VM_FF_PGM_NO_MEMORY);
}
}
LogFlow(("PGMR0PhysAllocateHandyPages: cPages=%d rc=%Rrc\n", cPages, rc));
return rc;
}
/**
* Worker function for PGMR3PhysAllocateLargeHandyPage
*
* @returns The following VBox status codes.
* @retval VINF_SUCCESS on success.
* @retval VINF_EM_NO_MEMORY if we're out of memory.
*
* @param pVM The VM handle.
* @param pVCpu The VMCPU handle.
*
* @remarks Must be called from within the PGM critical section. The caller
* must clear the new pages.
*/
VMMR0DECL(int) PGMR0PhysAllocateLargeHandyPage(PVM pVM, PVMCPU pVCpu)
{
Assert(PDMCritSectIsOwnerEx(&pVM->pgm.s.CritSect, pVCpu->idCpu));
Assert(!pVM->pgm.s.cLargeHandyPages);
int rc = GMMR0AllocateLargePage(pVM, pVCpu->idCpu, _2M, &pVM->pgm.s.aLargeHandyPage[0].idPage, &pVM->pgm.s.aLargeHandyPage[0].HCPhysGCPhys);
if (RT_SUCCESS(rc))
pVM->pgm.s.cLargeHandyPages = 1;
return rc;
}
/**
* #PF Handler for nested paging.
*
* @returns VBox status code (appropriate for trap handling and GC return).
* @param pVM VM Handle.
* @param pVCpu VMCPU Handle.
* @param enmShwPagingMode Paging mode for the nested page tables
* @param uErr The trap error code.
* @param pRegFrame Trap register frame.
* @param pvFault The fault address.
*/
VMMR0DECL(int) PGMR0Trap0eHandlerNestedPaging(PVM pVM, PVMCPU pVCpu, PGMMODE enmShwPagingMode, RTGCUINT uErr, PCPUMCTXCORE pRegFrame, RTGCPHYS pvFault)
{
int rc;
LogFlow(("PGMTrap0eHandler: uErr=%RGx pvFault=%RGp eip=%RGv\n", uErr, pvFault, (RTGCPTR)pRegFrame->rip));
STAM_PROFILE_START(&pVCpu->pgm.s.StatRZTrap0e, a);
STAM_STATS({ pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution) = NULL; } );
/* AMD uses the host's paging mode; Intel has a single mode (EPT). */
AssertMsg(enmShwPagingMode == PGMMODE_32_BIT || enmShwPagingMode == PGMMODE_PAE || enmShwPagingMode == PGMMODE_PAE_NX || enmShwPagingMode == PGMMODE_AMD64 || enmShwPagingMode == PGMMODE_AMD64_NX || enmShwPagingMode == PGMMODE_EPT, ("enmShwPagingMode=%d\n", enmShwPagingMode));
#ifdef VBOX_WITH_STATISTICS
/*
* Error code stats.
*/
if (uErr & X86_TRAP_PF_US)
{
if (!(uErr & X86_TRAP_PF_P))
{
if (uErr & X86_TRAP_PF_RW)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSNotPresentWrite);
else
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSNotPresentRead);
}
else if (uErr & X86_TRAP_PF_RW)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSWrite);
else if (uErr & X86_TRAP_PF_RSVD)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSReserved);
else if (uErr & X86_TRAP_PF_ID)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSNXE);
else
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eUSRead);
}
else
{ /* Supervisor */
if (!(uErr & X86_TRAP_PF_P))
{
if (uErr & X86_TRAP_PF_RW)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eSVNotPresentWrite);
else
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eSVNotPresentRead);
}
else if (uErr & X86_TRAP_PF_RW)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eSVWrite);
else if (uErr & X86_TRAP_PF_ID)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eSNXE);
else if (uErr & X86_TRAP_PF_RSVD)
STAM_COUNTER_INC(&pVCpu->pgm.s.StatRZTrap0eSVReserved);
}
#endif
/*
* Call the worker.
*
* We pretend the guest is in protected mode without paging, so we can use existing code to build the
* nested page tables.
*/
bool fLockTaken = false;
switch(enmShwPagingMode)
{
case PGMMODE_32_BIT:
rc = PGM_BTH_NAME_32BIT_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, pvFault, &fLockTaken);
break;
case PGMMODE_PAE:
case PGMMODE_PAE_NX:
rc = PGM_BTH_NAME_PAE_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, pvFault, &fLockTaken);
break;
case PGMMODE_AMD64:
case PGMMODE_AMD64_NX:
rc = PGM_BTH_NAME_AMD64_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, pvFault, &fLockTaken);
break;
case PGMMODE_EPT:
rc = PGM_BTH_NAME_EPT_PROT(Trap0eHandler)(pVCpu, uErr, pRegFrame, pvFault, &fLockTaken);
break;
default:
AssertFailed();
rc = VERR_INVALID_PARAMETER;
break;
}
if (fLockTaken)
{
Assert(PGMIsLockOwner(pVM));
pgmUnlock(pVM);
}
if (rc == VINF_PGM_SYNCPAGE_MODIFIED_PDE)
rc = VINF_SUCCESS;
else
/* Note: hack alert for difficult to reproduce problem. */
if ( rc == VERR_PAGE_NOT_PRESENT /* SMP only ; disassembly might fail. */
|| rc == VERR_PAGE_TABLE_NOT_PRESENT /* seen with UNI & SMP */
|| rc == VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT /* seen with SMP */
|| rc == VERR_PAGE_MAP_LEVEL4_NOT_PRESENT) /* precaution */
{
Log(("WARNING: Unexpected VERR_PAGE_TABLE_NOT_PRESENT (%d) for page fault at %RGp error code %x (rip=%RGv)\n", rc, pvFault, uErr, pRegFrame->rip));
/* Some kind of inconsistency in the SMP case; it's safe to just execute the instruction again; not sure about single VCPU VMs though. */
rc = VINF_SUCCESS;
}
STAM_STATS({ if (!pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution))
pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution) = &pVCpu->pgm.s.StatRZTrap0eTime2Misc; });
STAM_PROFILE_STOP_EX(&pVCpu->pgm.s.StatRZTrap0e, pVCpu->pgm.s.CTX_SUFF(pStatTrap0eAttribution), a);
return rc;
}
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