[edk2-devel] [PATCH v8 18/46] OvmfPkg/VmgExitLib: 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: Jordan Justen <jordan.l.justen at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel at arm.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
 .../Library/VmgExitLib/X64/VmgExitVcHandler.c | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c
index 50199845ceef..0cf26c052b32 100644
--- a/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/X64/VmgExitVcHandler.c
@@ -843,6 +843,38 @@ MmioExit (
   return Status;
 }
 
+/**
+  Handle a WBINVD event.
+
+  Use the VMGEXIT instruction to handle a WBINVD event.
+
+  @param[in, out] Ghcb             Pointer to the Guest-Hypervisor Communication
+                                   Block
+  @param[in, out] Regs             x64 processor context
+  @param[in]      InstructionData  Instruction parsing context
+
+  @retval 0                        Event handled successfully
+  @retval Others                   New exception value to propagate
+
+**/
+STATIC
+UINT64
+WbinvdExit (
+  IN OUT GHCB                     *Ghcb,
+  IN OUT EFI_SYSTEM_CONTEXT_X64   *Regs,
+  IN     SEV_ES_INSTRUCTION_DATA  *InstructionData
+  )
+{
+  UINT64  Status;
+
+  Status = VmgExit (Ghcb, SVM_EXIT_WBINVD, 0, 0);
+  if (Status) {
+    return Status;
+  }
+
+  return 0;
+}
+
 /**
   Handle an MSR event.
 
@@ -1238,6 +1270,10 @@ VmgExitHandleVc (
     NaeExit = MsrExit;
     break;
 
+  case SVM_EXIT_WBINVD:
+    NaeExit = WbinvdExit;
+    break;
+
   case SVM_EXIT_NPF:
     NaeExit = MmioExit;
     break;
-- 
2.17.1


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