From: Tom Lendacky <thomas.lenda...@amd.com>
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Under SEV-ES, a MWAIT/MWAITX 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/AMDSevVcCommon.c | 29 +++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
index 824175a80b9b..8cb595e5a625 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/AMDSevVcCommon.c
@@ -555,6 +555,31 @@ UnsupportedExit (
return Status;
}
+STATIC
+UINTN
+MwaitExit (
+ 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.Rcx = Regs->Rcx;
+ GhcbSetRegValid (Ghcb, GhcbRcx);
+
+ Status = VmgExit (Ghcb, SvmExitMwait, 0, 0);
+ if (Status) {
+ return Status;
+ }
+
+ return 0;
+}
+
STATIC
UINTN
MonitorExit (
@@ -1082,6 +1107,10 @@ DoVcCommon (
NaeExit = MonitorExit;
break;
+ case SvmExitMwait:
+ NaeExit = MwaitExit;
+ break;
+
case SvmExitNpf:
NaeExit = MmioExit;
break;
--
2.17.1
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