From: Tom Lendacky <thomas.lenda...@amd.com> Under SEV-ES, a VMMCALL intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept.
Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> --- .../X64/AMDSevVcCommon.c | 35 +++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c index 3f10af401aa0..1a0a8f5cd718 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c @@ -546,6 +546,37 @@ WbinvdExit ( return 0; } +STATIC +UINTN +VmmCallExit ( + GHCB *Ghcb, + EFI_SYSTEM_CONTEXT_X64 *Regs, + SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + UINTN Status; + + DecodeModRm (Regs, InstructionData); + + Ghcb->SaveArea.Rax = Regs->Rax; + GhcbSetRegValid (Ghcb, GhcbRax); + Ghcb->SaveArea.Cpl = (UINT8) (Regs->Cs & 0x3); + GhcbSetRegValid (Ghcb, GhcbCpl); + + Status = VmgExit (Ghcb, SvmExitVmmCall, 0, 0); + if (Status) { + return Status; + } + + if (!GhcbIsRegValid (Ghcb, GhcbRax)) { + VmgExit (Ghcb, SvmExitUnsupported, SvmExitVmmCall, 0); + ASSERT (0); + } + Regs->Rax = Ghcb->SaveArea.Rax; + + return 0; +} + STATIC UINTN MsrExit ( @@ -970,6 +1001,10 @@ DoVcCommon ( NaeExit = MsrExit; break; + case SvmExitVmmCall: + NaeExit = VmmCallExit; + break; + case SvmExitWbinvd: NaeExit = WbinvdExit; break; -- 2.17.1 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#46090): https://edk2.groups.io/g/devel/message/46090 Mute This Topic: https://groups.io/mt/32966263/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-