[edk2-devel] [PATCH v6 21/42] UefiCpuPkg/CpuExceptionHandler: Add support for RDTSCP NAE events

[Lendacky, Thomas]

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

Under SEV-ES, a RDTSCP 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                 | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
index 7b57229a770c..fcd4738b2915 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchAMDSevVcHandler.c
@@ -609,6 +609,35 @@ WbinvdExit (
   return 0;
 }
 
+STATIC
+UINT64
+RdtscpExit (
+  GHCB                     *Ghcb,
+  EFI_SYSTEM_CONTEXT_X64   *Regs,
+  SEV_ES_INSTRUCTION_DATA  *InstructionData
+  )
+{
+  UINT64  Status;
+
+  DecodeModRm (Regs, InstructionData);
+
+  Status = VmgExit (Ghcb, SvmExitRdtscp, 0, 0);
+  if (Status) {
+    return Status;
+  }
+
+  if (!GhcbIsRegValid (Ghcb, GhcbRax) ||
+      !GhcbIsRegValid (Ghcb, GhcbRcx) ||
+      !GhcbIsRegValid (Ghcb, GhcbRdx)) {
+    return UnsupportedExit (Ghcb, Regs, InstructionData);
+  }
+  Regs->Rax = Ghcb->SaveArea.Rax;
+  Regs->Rcx = Ghcb->SaveArea.Rcx;
+  Regs->Rdx = Ghcb->SaveArea.Rdx;
+
+  return 0;
+}
+
 STATIC
 UINT64
 VmmCallExit (
@@ -1039,6 +1068,10 @@ DoVcCommon (
     NaeExit = VmmCallExit;
     break;
 
+  case SvmExitRdtscp:
+    NaeExit = RdtscpExit;
+    break;
+
   case SvmExitWbinvd:
     NaeExit = WbinvdExit;
     break;
-- 
2.17.1


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