BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Under SEV-ES, a RDPMC intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Eric Dong <eric.d...@intel.com> Cc: Ray Ni <ray...@intel.com> Cc: Laszlo Ersek <ler...@redhat.com> Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> --- .../X64/ArchAMDSevVcHandler.c | 46 +++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c index edd868c584a6..64db5eef128f 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c @@ -1207,6 +1207,48 @@ CpuidExit ( return 0; } +/** + Handle a RDPMC event. + + Use the VMGEXIT instruction to handle a RDPMC 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 +RdpmcExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINT64 Status; + + Ghcb->SaveArea.Rcx = Regs->Rcx; + GhcbSetRegValid (Ghcb, GhcbRcx); + + Status = VmgExit (Ghcb, SvmExitRdpmc, 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; +} + /** Handle a RDTSC event. @@ -1280,6 +1322,10 @@ DoVcCommon ( NaeExit = RdtscExit; break; + case SvmExitRdpmc: + NaeExit = RdpmcExit; + break; + case SvmExitCpuid: NaeExit = CpuidExit; break; -- 2.17.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#57850): https://edk2.groups.io/g/devel/message/57850 Mute This Topic: https://groups.io/mt/73201914/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-