From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: pbonzini@redhat.com, seanjc@google.com
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
chao.gao@intel.com, chang.seok.bae@intel.com
Subject: [PATCH v3 15/20] KVM: x86: Reject EVEX-prefixed instructions
Date: Tue, 28 Apr 2026 05:01:06 +0000 [thread overview]
Message-ID: <20260428050111.39323-16-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20260428050111.39323-1-chang.seok.bae@intel.com>
Explicitly mark EVEX-prefixed opcodes (0x62) as unsupported.
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
---
arch/x86/kvm/emulate.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index efe8adca1317..31118ae3b6a1 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5052,6 +5052,11 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len, int
if (ctxt->d & NoRex2 && ctxt->rex_prefix == REX2_PREFIX)
opcode.flags = Undefined;
+ /* EVEX-prefixed instructions are not implemented */
+ if (ctxt->opcode_len == 1 && ctxt->b == 0x62 &&
+ (mode == X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) == 0xc0))
+ opcode.flags = NotImpl;
+
if (opcode.flags & ModRM)
ctxt->modrm = insn_fetch(u8, ctxt);
--
2.51.0
next prev parent reply other threads:[~2026-04-28 5:26 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-28 5:00 [PATCH v3 00/20] KVM: x86: Enable APX for guests Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 01/20] KVM: VMX: Macrofy 64-bit GPR swapping in __vmx_vcpu_run() Chang S. Bae
2026-04-28 9:03 ` Paolo Bonzini
2026-04-28 20:12 ` Chang S. Bae
2026-04-29 7:50 ` Paolo Bonzini
2026-04-29 17:22 ` Chang S. Bae
2026-04-28 9:09 ` Paolo Bonzini
2026-04-28 5:00 ` [PATCH v3 02/20] KVM: SVM: Macrofy 64-bit GPR swapping in __svm_vcpu_run() Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 03/20] KVM: SEV: Macrofy 64-bit GPR swapping in __svm_sev_es_vcpu_run() Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 04/20] KVM: x86: Extend VCPU registers for EGPRs Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 05/20] KVM: VMX: Save guest EGPRs in VCPU cache Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 06/20] KVM: x86: Support APX state for XSAVE ABI Chang S. Bae
2026-04-28 9:31 ` Paolo Bonzini
2026-04-28 5:00 ` [PATCH v3 07/20] KVM: VMX: Refactor VMX instruction information access Chang S. Bae
2026-04-28 5:00 ` [PATCH v3 08/20] KVM: VMX: Refactor instruction information decoding Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 09/20] KVM: VMX: Refactor register index retrieval from exit qualification Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 10/20] KVM: VMX: Support instruction information extension Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 11/20] KVM: nVMX: Propagate the extended instruction info field Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 12/20] KVM: x86: Support EGPR accessing and tracking for emulator Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 13/20] KVM: x86: Handle EGPR index and REX2-incompatible opcodes Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 14/20] KVM: x86: Support REX2-prefixed opcode decode Chang S. Bae
2026-04-28 5:01 ` Chang S. Bae [this message]
2026-04-28 5:01 ` [PATCH v3 16/20] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 17/20] KVM: x86: Expose APX foundation feature to guests Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 18/20] KVM: x86: Expose APX sub-features " Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 19/20] KVM: x86: selftests: Add APX state and ABI test Chang S. Bae
2026-04-28 5:01 ` [PATCH v3 20/20] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks Chang S. Bae
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