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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 | f4571f24d141399a89dc70bdc14ea7d27cc896bb (patch) | |
| tree | 4a66f3745e6396a339d754d9d30d260731cab4cd /OvmfPkg/Library | |
| parent | e4bb269a85b014171d009ee741ca4506a20935b8 (diff) | |
| download | edk2-f4571f24d141399a89dc70bdc14ea7d27cc896bb.tar.gz edk2-f4571f24d141399a89dc70bdc14ea7d27cc896bb.tar.bz2 edk2-f4571f24d141399a89dc70bdc14ea7d27cc896bb.zip | |
OvmfPkg/VmgExitLib: Add support for RDTSCP NAE events
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: 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/Library')
| -rw-r--r-- | OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c index dbea9c1f6a..9bb32f0c3c 100644 --- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c @@ -884,6 +884,49 @@ WbinvdExit ( }
/**
+ Handle a RDTSCP event.
+
+ Use the VMGEXIT instruction to handle a RDTSCP 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
+RdtscpExit (
+ IN OUT GHCB *Ghcb,
+ IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
+ IN SEV_ES_INSTRUCTION_DATA *InstructionData
+ )
+{
+ UINT64 Status;
+
+ DecodeModRm (Regs, InstructionData);
+
+ Status = VmgExit (Ghcb, SVM_EXIT_RDTSCP, 0, 0);
+ if (Status != 0) {
+ 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;
+}
+
+/**
Handle a VMMCALL event.
Use the VMGEXIT instruction to handle a VMMCALL event.
@@ -1445,6 +1488,10 @@ VmgExitHandleVc ( NaeExit = VmmCallExit;
break;
+ case SVM_EXIT_RDTSCP:
+ NaeExit = RdtscpExit;
+ break;
+
case SVM_EXIT_WBINVD:
NaeExit = WbinvdExit;
break;
|