/**
* @callback_method_impl{PFNVMMEMTRENDEZVOUS,
* Worker for gimR3KvmEnableWallClock}
*/
static DECLCALLBACK(VBOXSTRICTRC) gimR3KvmEnableWallClockCallback(PVM pVM, PVMCPU pVCpu, void *pvData)
{
Assert(pvData);
PKVMWALLCLOCKINFO pWallClockInfo = (PKVMWALLCLOCKINFO)pvData;
RTGCPHYS GCPhysWallClock = pWallClockInfo->GCPhysWallClock;
/*
* Read the wall-clock version (sequence) from the guest.
*/
uint32_t uVersion;
Assert(PGMPhysIsGCPhysNormal(pVM, GCPhysWallClock));
int rc = PGMPhysSimpleReadGCPhys(pVM, &uVersion, GCPhysWallClock, sizeof(uVersion));
if (RT_FAILURE(rc))
{
LogRel(("GIM: KVM: Failed to read wall-clock struct. version at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
return rc;
}
/*
* Ensure the version is incrementally even.
*/
if (!(uVersion & 1))
++uVersion;
++uVersion;
/*
* Update wall-clock guest struct. with UTC information.
*/
RTTIMESPEC TimeSpec;
int32_t iSec;
int32_t iNano;
TMR3UtcNow(pVM, &TimeSpec);
RTTimeSpecGetSecondsAndNano(&TimeSpec, &iSec, &iNano);
GIMKVMWALLCLOCK WallClock;
RT_ZERO(WallClock);
AssertCompile(sizeof(uVersion) == sizeof(WallClock.u32Version));
WallClock.u32Version = uVersion;
WallClock.u32Sec = iSec;
WallClock.u32Nano = iNano;
/*
* Write out the wall-clock struct. to guest memory.
*/
Assert(!(WallClock.u32Version & 1));
rc = PGMPhysSimpleWriteGCPhys(pVM, GCPhysWallClock, &WallClock, sizeof(GIMKVMWALLCLOCK));
if (RT_SUCCESS(rc))
{
LogRel(("GIM: KVM: Enabled wall-clock struct. at %#RGp - u32Sec=%u u32Nano=%u uVersion=%#RU32\n", GCPhysWallClock,
WallClock.u32Sec, WallClock.u32Nano, WallClock.u32Version));
}
else
LogRel(("GIM: KVM: Failed to write wall-clock struct. at %#RGp. rc=%Rrc\n", GCPhysWallClock, rc));
return rc;
}
/**
* Writes guest memory.
*
* @returns VBox status code.
*
* @param pUVM The user mode VM handle.
* @param idCpu The ID of the target CPU context (for the address).
* @param pAddress Where to start writing.
* @param pvBuf The data to write.
* @param cbWrite The number of bytes to write.
*/
static DECLCALLBACK(int) dbgfR3MemWrite(PUVM pUVM, VMCPUID idCpu, PCDBGFADDRESS pAddress, void const *pvBuf, size_t cbWrite)
{
/*
* Validate the input we use, PGM does the rest.
*/
if (!DBGFR3AddrIsValid(pUVM, pAddress))
return VERR_INVALID_POINTER;
if (!VALID_PTR(pvBuf))
return VERR_INVALID_POINTER;
PVM pVM = pUVM->pVM;
VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
/*
* HMA is always special.
*/
int rc;
if (DBGFADDRESS_IS_HMA(pAddress))
{
/** @todo write to HMA. */
rc = VERR_ACCESS_DENIED;
}
else
{
/*
* Select PGM function by addressing mode.
*/
PVMCPU pVCpu = VMMGetCpuById(pVM, idCpu);
PGMMODE enmMode = PGMGetGuestMode(pVCpu);
if ( enmMode == PGMMODE_REAL
|| enmMode == PGMMODE_PROTECTED
|| DBGFADDRESS_IS_PHYS(pAddress) )
rc = PGMPhysSimpleWriteGCPhys(pVM, pAddress->FlatPtr, pvBuf, cbWrite);
else
{
#if GC_ARCH_BITS > 32
if ( ( pAddress->FlatPtr >= _4G
|| pAddress->FlatPtr + cbWrite > _4G)
&& enmMode != PGMMODE_AMD64
&& enmMode != PGMMODE_AMD64_NX)
return VERR_PAGE_TABLE_NOT_PRESENT;
#endif
rc = PGMPhysSimpleWriteGCPtr(pVCpu, pAddress->FlatPtr, pvBuf, cbWrite);
}
}
return rc;
}
/**
* Enables the KVM VCPU system-time structure.
*
* @returns VBox status code.
* @param pVM Pointer to the VM.
* @param pVCpu Pointer to the VMCPU.
*
* @remarks Don't do any release assertions here, these can be triggered by
* guest R0 code.
*/
VMMR3_INT_DECL(int) gimR3KvmEnableSystemTime(PVM pVM, PVMCPU pVCpu)
{
PGIMKVM pKvm = &pVM->gim.s.u.Kvm;
PGIMKVMCPU pKvmCpu = &pVCpu->gim.s.u.KvmCpu;
/*
* Validate the mapping address first.
*/
if (!PGMPhysIsGCPhysNormal(pVM, pKvmCpu->GCPhysSystemTime))
{
LogRel(("GIM: KVM: VCPU%3d: Invalid physical addr requested for mapping system-time struct. GCPhysSystemTime=%#RGp\n",
pVCpu->idCpu, pKvmCpu->GCPhysSystemTime));
return VERR_GIM_OPERATION_FAILED;
}
/*
* Construct the system-time struct.
*/
GIMKVMSYSTEMTIME SystemTime;
RT_ZERO(SystemTime);
SystemTime.u32Version = pKvmCpu->u32SystemTimeVersion;
SystemTime.u64NanoTS = pKvmCpu->uVirtNanoTS;
SystemTime.u64Tsc = pKvmCpu->uTsc;
SystemTime.fFlags = pKvmCpu->fSystemTimeFlags | GIM_KVM_SYSTEM_TIME_FLAGS_TSC_STABLE;
/*
* How the guest calculates the system time (nanoseconds):
*
* tsc = rdtsc - SysTime.u64Tsc
* if (SysTime.i8TscShift >= 0)
* tsc <<= i8TscShift;
* else
* tsc >>= -i8TscShift;
* time = ((tsc * SysTime.u32TscScale) >> 32) + SysTime.u64NanoTS
*/
uint64_t u64TscFreq = pKvm->cTscTicksPerSecond;
SystemTime.i8TscShift = 0;
while (u64TscFreq > 2 * RT_NS_1SEC_64)
{
u64TscFreq >>= 1;
SystemTime.i8TscShift--;
}
uint32_t uTscFreqLo = (uint32_t)u64TscFreq;
while (uTscFreqLo <= RT_NS_1SEC)
{
uTscFreqLo <<= 1;
SystemTime.i8TscShift++;
}
SystemTime.u32TscScale = ASMDivU64ByU32RetU32(RT_NS_1SEC_64 << 32, uTscFreqLo);
/*
* Update guest memory with the system-time struct.
*/
Assert(!(SystemTime.u32Version & UINT32_C(1)));
int rc = PGMPhysSimpleWriteGCPhys(pVM, pKvmCpu->GCPhysSystemTime, &SystemTime, sizeof(GIMKVMSYSTEMTIME));
if (RT_SUCCESS(rc))
{
LogRel(("GIM: KVM: VCPU%3d: Enabled system-time struct. at %#RGp - u32TscScale=%#RX32 i8TscShift=%d uVersion=%#RU32 "
"fFlags=%#x uTsc=%#RX64 uVirtNanoTS=%#RX64\n", pVCpu->idCpu, pKvmCpu->GCPhysSystemTime, SystemTime.u32TscScale,
SystemTime.i8TscShift, SystemTime.u32Version, SystemTime.fFlags, pKvmCpu->uTsc, pKvmCpu->uVirtNanoTS));
TMR3CpuTickParavirtEnable(pVM);
}
else
LogRel(("GIM: KVM: VCPU%3d: Failed to write system-time struct. at %#RGp. rc=%Rrc\n",
pVCpu->idCpu, pKvmCpu->GCPhysSystemTime, rc));
return rc;
}
