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OvmfPkg/VmgExitLib: Add support for VMMCALL NAE events 

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2198

Under SEV-ES, a VMMCALL 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 15:21:38 -05:00 committed by mergify[bot]
parent 3caf1e2e22
commit e4bb269a85
1 changed files with 48 additions and 0 deletions
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48
OvmfPkg/Library/VmgExitLib/VmgExitVcHandler.c
View File

@ -883,6 +883,50 @@ WbinvdExit (
return VmgExit (Ghcb, SVM_EXIT_WBINVD, 0, 0);
}
/**
Handle a VMMCALL event.
Use the VMGEXIT instruction to handle a VMMCALL 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
VmmCallExit (
IN OUT GHCB *Ghcb,
IN OUT EFI_SYSTEM_CONTEXT_X64 *Regs,
IN SEV_ES_INSTRUCTION_DATA *InstructionData
)
{
UINT64 Status;
DecodeModRm (Regs, InstructionData);
Ghcb->SaveArea.Rax = Regs->Rax;
GhcbSetRegValid (Ghcb, GhcbRax);
Ghcb->SaveArea.Cpl = (UINT8) (Regs->Cs & 0x3);
GhcbSetRegValid (Ghcb, GhcbCpl);
Status = VmgExit (Ghcb, SVM_EXIT_VMMCALL, 0, 0);
if (Status != 0) {
return Status;
}
if (!GhcbIsRegValid (Ghcb, GhcbRax)) {
return UnsupportedExit (Ghcb, Regs, InstructionData);
}
Regs->Rax = Ghcb->SaveArea.Rax;
return 0;
}
/**
Handle an MSR event.
@ -1397,6 +1441,10 @@ VmgExitHandleVc (
NaeExit = MsrExit;
break;
case SVM_EXIT_VMMCALL:
NaeExit = VmmCallExit;
break;
case SVM_EXIT_WBINVD:
NaeExit = WbinvdExit;
break;