[edk2-devel] [PATCH v6 16/42] UefiCpuPkg/CpuExceptionHandler: Add support for WBINVD NAE events

[Lendacky, Thomas]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Under SEV-ES, a WBINVD intercept generates a #VC exception. VMGEXIT must be
used to allow the hypervisor to handle this intercept.

Cc: Eric Dong <eric.dong at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
 .../X64/ArchAMDSevVcHandler.c                 | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
index 3cac613c8889..55e18c47921e 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
@@ -591,6 +591,24 @@ MmioExit (
   return Status;
 }
 
+STATIC
+UINT64
+WbinvdExit (
+  GHCB                     *Ghcb,
+  EFI_SYSTEM_CONTEXT_X64   *Regs,
+  SEV_ES_INSTRUCTION_DATA  *InstructionData
+  )
+{
+  UINT64  Status;
+
+  Status = VmgExit (Ghcb, SvmExitWbinvd, 0, 0);
+  if (Status) {
+    return Status;
+  }
+
+  return 0;
+}
+
 STATIC
 UINT64
 MsrExit (
@@ -904,6 +922,10 @@ DoVcCommon (
     NaeExit = MsrExit;
     break;
 
+  case SvmExitWbinvd:
+    NaeExit = WbinvdExit;
+    break;
+
   case SvmExitNpf:
     NaeExit = MmioExit;
     break;
-- 
2.17.1


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