From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: pbonzini@redhat.com, seanjc@google.com
Cc: kvm@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org, chao.gao@intel.com,
chang.seok.bae@intel.com
Subject: [PATCH v4 16/21] KVM: x86: Reject EVEX-prefixed instructions
Date: Tue, 12 May 2026 01:14:57 +0000 [thread overview]
Message-ID: <20260512011502.53072-17-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20260512011502.53072-1-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:[~2026-05-12 1:40 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-12 1:14 [PATCH v4 00/21] KVM: x86: Enable APX for guests Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 01/21] KVM: VMX: Macrofy GPR swapping in __vmx_vcpu_run() Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 02/21] KVM: SVM: Macrofy GPR swapping in __svm_vcpu_run() Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 03/21] KVM: SEV: Macrofy GPR swapping in __svm_sev_es_vcpu_run() Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 04/21] KVM: x86: Extend VCPU registers for EGPRs Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 05/21] KVM: VMX: Save guest EGPRs in VCPU cache Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 06/21] x86/fpu: Ignore APX when copying from/to guest FPU Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 07/21] KVM: x86: Support APX state for XSAVE ABI Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 08/21] KVM: VMX: Refactor VMX instruction information access Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 09/21] KVM: VMX: Refactor instruction information decoding Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 10/21] KVM: VMX: Refactor register index retrieval from exit qualification Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 11/21] KVM: VMX: Support instruction information extension Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 12/21] KVM: nVMX: Propagate the extended instruction info field Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 13/21] KVM: x86: Support EGPR accessing and tracking for emulator Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 14/21] KVM: x86: Handle EGPR index and REX2-incompatible opcodes Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 15/21] KVM: x86: Support REX2-prefixed opcode decode Chang S. Bae
2026-05-12 1:14 ` Chang S. Bae [this message]
2026-05-12 1:14 ` [PATCH v4 17/21] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
2026-05-12 1:14 ` [PATCH v4 18/21] KVM: x86: Expose APX foundation feature to guests Chang S. Bae
2026-05-12 1:15 ` [PATCH v4 19/21] KVM: x86: Expose APX sub-features " Chang S. Bae
2026-05-12 1:15 ` [PATCH v4 20/21] KVM: x86: selftests: Add APX state and ABI test Chang S. Bae
2026-05-12 1:15 ` [PATCH v4 21/21] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks Chang S. Bae
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