[edk2-devel] [PATCH v15 18/46] OvmfPkg/VmgExitLib: Add support for WBINVD NAE events
Lendacky, Thomas
thomas.lendacky at amd.com
Thu Aug 13 13:23:05 UTC 2020
From: Tom Lendacky <thomas.lendacky at amd.com>
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>
Acked-by: Laszlo Ersek <lersek at redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 29 ++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
index 03fa9f6f7f46..2070c943de93 100644
--- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
@@ -858,6 +858,31 @@ 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
+ @return 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
+ )
+{
+ return VmgExit (Ghcb, SVM_EXIT_WBINVD, 0, 0);
+}
+
/**
Handle an MSR event.
@@ -1254,6 +1279,10 @@ VmgExitHandleVc (
NaeExit = MsrExit;
break;
+ case SVM_EXIT_WBINVD:
+ NaeExit = WbinvdExit;
+ break;
+
case SVM_EXIT_NPF:
NaeExit = MmioExit;
break;
--
2.28.0
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