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x86/sev: Check for MWAITX and MONITORX opcodes in the #VC handler 

The MWAITX and MONITORX instructions generate the same #VC error code as
the MWAIT and MONITOR instructions, respectively. Update the #VC handler
opcode checking to also support the MWAITX and MONITORX opcodes.

Fixes: e3ef461af3 ("x86/sev: Harden #VC instruction emulation somewhat")
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/453d5a7cfb4b9fe818b6fb67f93ae25468bc9e23.1713793161.git.thomas.lendacky@amd.com
This commit is contained in:
Tom Lendacky 2024-04-22 08:39:21 -05:00 committed by Borislav Petkov (AMD)
parent ed30a4a51b
commit e70316d17f
1 changed files with 4 additions and 2 deletions
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6
arch/x86/kernel/sev-shared.c
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@ -1203,12 +1203,14 @@ static enum es_result vc_check_opcode_bytes(struct es_em_ctxt *ctxt,
break;
case SVM_EXIT_MONITOR:
if (opcode == 0x010f && modrm == 0xc8)
/* MONITOR and MONITORX instructions generate the same error code */
if (opcode == 0x010f && (modrm == 0xc8 || modrm == 0xfa))
return ES_OK;
break;
case SVM_EXIT_MWAIT:
if (opcode == 0x010f && modrm == 0xc9)
/* MWAIT and MWAITX instructions generate the same error code */
if (opcode == 0x010f && (modrm == 0xc9 || modrm == 0xfb))
return ES_OK;
break;