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charset="us-ascii" Content-ID: <906AD48AC58E9B42867A216AB1681FBF@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 RDTSC 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 | 30 +++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c= b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index f8966cc3eca0..1f6a1f9a30ce 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -865,6 +865,32 @@ CpuidExit ( return 0; } =20 +STATIC +UINTN +RdtscExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINTN Status; + + Status =3D VmgExit (Ghcb, SvmExitRdtsc, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax) || + !GhcbIsRegValid (Ghcb, GhcbRdx)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitRdtsc, 0); + ASSERT (0); + } + Regs->Rax =3D Ghcb->SaveArea.Rax; + Regs->Rdx =3D Ghcb->SaveArea.Rdx; + + return 0; +} + UINTN DoVcCommon ( GHCB *Ghcb, @@ -881,6 +907,10 @@ DoVcCommon ( =20 ExitCode =3D Regs->ExceptionData; switch (ExitCode) { + case SvmExitRdtsc: + NaeExit =3D RdtscExit; + break; + case SvmExitCpuid: NaeExit =3D CpuidExit; break; --=20 2.17.1