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OvmfPkg/VmgExitLib: Add support for MWAIT/MWAITX NAE events 

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.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>
This commit is contained in:
Tom Lendacky 2020-08-12 15:21:39 -05:00 committed by mergify[bot]
parent 3ef8bfc2b3
commit 9f7e0d0ade
1 changed files with 36 additions and 0 deletions
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36
OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
View File

@ -858,6 +858,38 @@ 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.
@ -1534,6 +1566,10 @@ VmgExitHandleVc (
NaeExit = MonitorExit;
break;
case SVM_EXIT_MWAIT:
NaeExit = MwaitExit;
break;
case SVM_EXIT_NPF:
NaeExit = MmioExit;
break;