From: Tom Lendacky <thomas.lenda...@amd.com> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198
Under SEV-ES, a MWAIT/MWAITX intercept generates a #VC exception. VMGEXIT must be used to allow the hypervisor to handle this intercept. Cc: Jordan Justen <jordan.l.jus...@intel.com> Cc: Laszlo Ersek <ler...@redhat.com> Cc: Ard Biesheuvel <ard.biesheu...@arm.com> Acked-by: Laszlo Ersek <ler...@redhat.com> Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com> --- OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c | 36 +++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c index fe08b1e0ff49..e70e0ef82f68 100644 --- a/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c +++ b/OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c @@ -856,6 +856,38 @@ MmioExit ( return Status; } +/** + Handle a MWAIT event. + + Use the VMGEXIT instruction to handle a MWAIT 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 +MwaitExit ( + IN OUT GHCB *Ghcb, + IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs, + IN SEV_ES_INSTRUCTION_DATA *InstructionData + ) +{ + DecodeModRm (Regs, InstructionData); + + Ghcb->SaveArea.Rax = Regs->Rax; + GhcbSetRegValid (Ghcb, GhcbRax); + Ghcb->SaveArea.Rcx = Regs->Rcx; + GhcbSetRegValid (Ghcb, GhcbRcx); + + return VmgExit (Ghcb, SVM_EXIT_MWAIT, 0, 0); +} + /** Handle a MONITOR event. @@ -1532,6 +1564,10 @@ VmgExitHandleVc ( NaeExit = MonitorExit; break; + case SVM_EXIT_MWAIT: + NaeExit = MwaitExit; + break; + case SVM_EXIT_NPF: NaeExit = MmioExit; break; -- 2.27.0 -=-=-=-=-=-=-=-=-=-=-=- Groups.io Links: You receive all messages sent to this group. View/Reply Online (#62528): https://edk2.groups.io/g/devel/message/62528 Mute This Topic: https://groups.io/mt/75500006/21656 Group Owner: devel+ow...@edk2.groups.io Unsubscribe: https://edk2.groups.io/g/devel/unsub [arch...@mail-archive.com] -=-=-=-=-=-=-=-=-=-=-=-