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VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Eric Dong Cc: Ray Ni Cc: Laszlo Ersek Signed-off-by: Tom Lendacky --- .../X64/ArchAMDSevVcHandler.c | 43 +++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c index 29e88147aab3..edd868c584a6 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c @@ -1207,6 +1207,45 @@ CpuidExit ( return 0; } +/** + Handle a RDTSC event. + + Use the VMGEXIT instruction to handle a RDTSC event. + + @param[in, out] Ghcb Pointer to the Guest-Hypervisor Communication + Block + @param[in, out] Regs x64 processor context + @param[in] InstructionData Instruction parsing context + + @retval 0 Event handled successfully + @retval Others New exception value to propagate + +**/ +STATIC +UINT64 +RdtscExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 Status; + + Status = VmgExit (Ghcb, SvmExitRdtsc, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + return UnsupportedExit (Ghcb, Regs, InstructionData); + } + Regs->Rax = Ghcb->SaveArea.Rax; + Regs->Rdx = Ghcb->SaveArea.Rdx; + + return 0; +} + /** Common #VC exception handling routine. @@ -1237,6 +1276,10 @@ DoVcCommon ( ExitCode = Regs->ExceptionData; switch (ExitCode) { + case SvmExitRdtsc: + NaeExit = RdtscExit; + break; + case SvmExitCpuid: NaeExit = CpuidExit; break; -- 2.17.1