/**
* Converts an address to a guest physical address.
*
* @returns VBox status code.
* @retval VINF_SUCCESS
* @retval VERR_INVALID_PARAMETER if the address is invalid.
* @retval VERR_INVALID_STATE if the VM is being terminated or if the virtual
* CPU handle is invalid.
* @retval VERR_NOT_SUPPORTED is the type of address cannot be converted.
* @retval VERR_PAGE_NOT_PRESENT
* @retval VERR_PAGE_TABLE_NOT_PRESENT
* @retval VERR_PAGE_DIRECTORY_PTR_NOT_PRESENT
* @retval VERR_PAGE_MAP_LEVEL4_NOT_PRESENT
*
* @param pVM The VM handle.
* @param idCpu The ID of the CPU context to convert virtual
* addresses.
* @param pAddress The address.
* @param pGCPhys Where to return the physical address.
*/
VMMR3DECL(int) DBGFR3AddrToPhys(PVM pVM, VMCPUID idCpu, PDBGFADDRESS pAddress, PRTGCPHYS pGCPhys)
{
/*
* Parameter validation.
*/
AssertPtr(pGCPhys);
*pGCPhys = NIL_RTGCPHYS;
AssertPtr(pAddress);
AssertReturn(DBGFADDRESS_IS_VALID(pAddress), VERR_INVALID_PARAMETER);
VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_STATE);
AssertReturn(idCpu < pVM->cCpus, VERR_INVALID_PARAMETER);
/*
* Convert by address type.
*/
int rc;
if (pAddress->fFlags & DBGFADDRESS_FLAGS_HMA)
rc = VERR_NOT_SUPPORTED;
else if (pAddress->fFlags & DBGFADDRESS_FLAGS_PHYS)
{
*pGCPhys = pAddress->FlatPtr;
rc = VINF_SUCCESS;
}
else
{
PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
if (VMCPU_IS_EMT(pVCpu))
rc = dbgfR3AddrToPhysOnVCpu(pVCpu, pAddress, pGCPhys);
else
rc = VMR3ReqCallWait(pVCpu->pVMR3, pVCpu->idCpu,
(PFNRT)dbgfR3AddrToPhysOnVCpu, 3, pVCpu, pAddress, pGCPhys);
}
return rc;
}
csamCodePageWriteHandler(PVM pVM, PVMCPU pVCpu, RTGCPTR GCPtr, void *pvPtr, void *pvBuf, size_t cbBuf,
PGMACCESSTYPE enmAccessType, PGMACCESSORIGIN enmOrigin, void *pvUser)
{
Log(("csamCodePageWriteHandler: write to %RGv LB %zu\n", GCPtr, cbBuf));
Assert(enmAccessType == PGMACCESSTYPE_WRITE); NOREF(enmAccessType);
Assert(VMCPU_IS_EMT(pVCpu));
/*
* Check if it's a dummy write that doesn't change anything.
*/
if ( PAGE_ADDRESS(pvPtr) == PAGE_ADDRESS((uintptr_t)pvPtr + cbBuf - 1)
&& !memcmp(pvPtr, pvBuf, cbBuf))
{
Log(("csamCodePageWriteHandler: dummy write -> ignore\n"));
return VINF_PGM_HANDLER_DO_DEFAULT;
}
#ifdef IN_RING3
/*
* Ring-3: Do proper handling.
*/
int rc = PATMR3PatchWrite(pVM, GCPtr, (uint32_t)cbBuf);
AssertRC(rc);
return VINF_PGM_HANDLER_DO_DEFAULT;
#else
/*
* Raw-mode: Try avoid needing to go to ring-3 (same as csamRCCodePageWritePfHandler).
*/
uint32_t const cpl = CPUMGetGuestCPL(pVCpu);
bool const fPatchCode = PATMIsPatchGCAddr(pVM, CPUMGetGuestRIP(pVCpu));
PPATMGCSTATE pPATMGCState = PATMGetGCState(pVM);
Assert(pVM->csam.s.cDirtyPages < CSAM_MAX_DIRTY_PAGES);
Assert(pPATMGCState);
Assert(pPATMGCState->fPIF || fPatchCode);
# ifdef VBOX_WITH_REM
/* Flush the recompilers translation block cache as the guest seems to be modifying instructions. */
/** @todo a bit overkill?? */
REMFlushTBs(pVM);
# endif
/*
* When patch code is executing instructions that must complete, then we
* must *never* interrupt it.
*/
if (!pPATMGCState->fPIF && fPatchCode)
{
Log(("csamRCCodePageWriteHandler: fPIF=0 -> stack fault in patch generated code at %08RX32!\n", CPUMGetGuestRIP(pVCpu)));
return VINF_PGM_HANDLER_DO_DEFAULT;
}
Log(("csamRCCodePageWriteHandler: code page write at %RGv (cpl=%d)\n", GCPtr, cpl));
/*
* If user code is modifying one of our monitored pages, then we can safely
* write to it as it's no longer being used for supervisor code.
*/
if (cpl != 3)
{
VBOXSTRICTRC rcStrict = PATMRCHandleWriteToPatchPage(pVM, NULL /* pRegFrame = no interpret */, (RTRCPTR)GCPtr, cbBuf);
if ( rcStrict == VINF_PGM_HANDLER_DO_DEFAULT
|| rcStrict == VINF_SUCCESS)
return rcStrict;
if (rcStrict == VINF_EM_RAW_EMULATE_INSTR)
{
STAM_COUNTER_INC(&pVM->csam.s.StatDangerousWrite);
return VINF_EM_RAW_EMULATE_INSTR;
}
Assert(rcStrict == VERR_PATCH_NOT_FOUND);
}
/*
* Schedule ring-3 activity.
* Note that GCPtr might be a different address in case of aliases. So,
* take down both alternatives.
*/
VMCPU_FF_SET(pVCpu, VMCPU_FF_CSAM_PENDING_ACTION);
pVM->csam.s.pvDirtyBasePage[pVM->csam.s.cDirtyPages] = (RTRCPTR)GCPtr;
pVM->csam.s.pvDirtyFaultPage[pVM->csam.s.cDirtyPages] = (RTRCPTR)GCPtr;
if (++pVM->csam.s.cDirtyPages == CSAM_MAX_DIRTY_PAGES)
return VINF_CSAM_PENDING_ACTION;
/*
* Continue with the write. The VM_FF_CSAM_FLUSH_DIRTY_PAGE handler will reset it to readonly again.
*/
Log(("csamRCCodePageWriteHandler: enabled r/w for page %RGv (%RGv)\n", GCPtr, GCPtr));
STAM_COUNTER_INC(&pVM->csam.s.StatCodePageModified);
return VINF_PGM_HANDLER_DO_DEFAULT;
#endif
}
