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authorTom Lendacky <thomas.lendacky@amd.com>2024-04-22 16:39:21 +0300
committerBorislav Petkov (AMD) <bp@alien8.de>2024-04-22 19:38:28 +0300
commite70316d17f6ab49a6038ffd115397fd68f8c7be8 (patch)
treed234e457445fe7d5bd88961f48579cb9c8e27953 /arch
parented30a4a51bb196781c8058073ea720133a65596f (diff)
downloadlinux-e70316d17f6ab49a6038ffd115397fd68f8c7be8.tar.xz
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: e3ef461af35a ("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
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/sev-shared.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c
index 8b04958da5e7..b4f8fa0f722c 100644
--- a/arch/x86/kernel/sev-shared.c
+++ b/arch/x86/kernel/sev-shared.c
@@ -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;