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charset="us-ascii" Content-ID: <9760F07079484F4091B9F52866C64C23@namprd12.prod.outlook.com> Content-Transfer-Encoding: quoted-printable From: Tom Lendacky BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3D2198 Under SEV-ES, a RDTSCP intercept generates a #VC exception. 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/AMDSevVcCommon.c | 34 +++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c= b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index e9449deaa98b..c8efc5c4c106 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -573,6 +573,36 @@ WbinvdExit ( return 0; } =20 +STATIC +UINTN +RdtscpExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINTN Status; + + DecodeModRm (Regs, InstructionData); + + Status =3D VmgExit (Ghcb, SvmExitRdtscp, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRcx) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitRdtscp, 0); + ASSERT (0); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rcx =3D Ghcb->SaveArea.Rcx; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + + return 0; +} + STATIC UINTN VmmCallExit ( @@ -1013,6 +1043,10 @@ DoVcCommon ( NaeExit =3D VmmCallExit; break; =20 + case SvmExitRdtscp: + NaeExit =3D RdtscpExit; + break; + case SvmExitWbinvd: NaeExit =3D WbinvdExit; break; --=20 2.17.1