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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2020-08-12 15:21:38 -0500 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2020-08-17 02:46:39 +0000 |
| commit | 68d18bef415d0c9e526ce90a3b1d83778e50e7b2 (patch) | |
| tree | da18145faa20fb1c929517a84e308c6cc1ce4696 /OvmfPkg | |
| parent | 4de7047976107bf27cc0f851b7ed3cbd90982149 (diff) | |
| download | edk2-68d18bef415d0c9e526ce90a3b1d83778e50e7b2.tar.gz edk2-68d18bef415d0c9e526ce90a3b1d83778e50e7b2.tar.bz2 edk2-68d18bef415d0c9e526ce90a3b1d83778e50e7b2.zip | |
OvmfPkg/VmgExitLib: Add support for RDTSC NAE events
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Under SEV-ES, a RDTSC 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.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c index 2070c943de..aa1e78f357 100644 --- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c @@ -1224,6 +1224,45 @@ CpuidExit ( }
/**
+ Handle a RDTSC event.
+
+ Use the VMGEXIT instruction to handle a RDTSC 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
+RdtscExit (
+ IN OUT GHCB *Ghcb,
+ IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
+ IN SEV_ES_INSTRUCTION_DATA *InstructionData
+ )
+{
+ UINT64 Status;
+
+ Status = VmgExit (Ghcb, SVM_EXIT_RDTSC, 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 #VC exception.
Performs the necessary processing to handle a #VC exception.
@@ -1267,6 +1306,10 @@ VmgExitHandleVc ( ExitCode = Regs->ExceptionData;
switch (ExitCode) {
+ case SVM_EXIT_RDTSC:
+ NaeExit = RdtscExit;
+ break;
+
case SVM_EXIT_CPUID:
NaeExit = CpuidExit;
break;
|