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authorTom Lendacky <thomas.lendacky@amd.com>2020-08-12 15:21:38 -0500
committermergify[bot] <37929162+mergify[bot]@users.noreply.github.com>2020-08-17 02:46:39 +0000
commit5894fb1fa2a4a977c9c8cec16f24d9e621a7e09b (patch)
tree3f5a846a1290dcb8ec62aa2ca3e545364e75d7bc /OvmfPkg
parent68d18bef415d0c9e526ce90a3b1d83778e50e7b2 (diff)
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OvmfPkg/VmgExitLib: Add support for RDPMC NAE events
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198 Under SEV-ES, a RDPMC intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Ard Biesheuvel <ard.biesheuvel@arm.com> Acked-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Regression-tested-by: Laszlo Ersek <lersek@redhat.com>
Diffstat (limited to 'OvmfPkg')
-rw-r--r--OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
index aa1e78f357..0dd119fdec 100644
--- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
+++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
@@ -1224,6 +1224,48 @@ CpuidExit (
}
/**
+ Handle a RDPMC event.
+
+ Use the VMGEXIT instruction to handle a RDPMC 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
+RdpmcExit (
+ IN OUT GHCB *Ghcb,
+ IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
+ IN SEV_ES_INSTRUCTION_DATA *InstructionData
+ )
+{
+ UINT64 Status;
+
+ Ghcb->SaveArea.Rcx = Regs->Rcx;
+ GhcbSetRegValid (Ghcb, GhcbRcx);
+
+ Status = VmgExit (Ghcb, SVM_EXIT_RDPMC, 0, 0);
+ if (Status != 0) {
+ return Status;
+ }
+
+ if (!GhcbIsRegValid (Ghcb, GhcbRax) ||
+ !GhcbIsRegValid (Ghcb, GhcbRdx)) {
+ return UnsupportedExit (Ghcb, Regs, InstructionData);
+ }
+ Regs->Rax = Ghcb->SaveArea.Rax;
+ Regs->Rdx = Ghcb->SaveArea.Rdx;
+
+ return 0;
+}
+
+/**
Handle a RDTSC event.
Use the VMGEXIT instruction to handle a RDTSC event.
@@ -1310,6 +1352,10 @@ VmgExitHandleVc (
NaeExit = RdtscExit;
break;
+ case SVM_EXIT_RDPMC:
+ NaeExit = RdpmcExit;
+ break;
+
case SVM_EXIT_CPUID:
NaeExit = CpuidExit;
break;