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 v2 12/16] KVM: emulate: Reject EVEX-prefixed instructions
Date: Mon, 12 Jan 2026 23:54:04 +0000 [thread overview]
Message-ID: <20260112235408.168200-13-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20260112235408.168200-1-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 1a565a4e3ff7..c5cb356f1524 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5040,6 +5040,11 @@ 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:[~2026-01-13 0:18 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-12 23:53 [PATCH v2 00/16] KVM: x86: Enable APX for guests Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 01/16] KVM: x86: Rename register accessors to be GPR-specific Chang S. Bae
2026-03-05 1:35 ` Sean Christopherson
2026-03-07 1:32 ` Chang S. Bae
2026-03-09 23:28 ` Chang S. Bae
2026-03-10 1:23 ` Sean Christopherson
2026-03-10 22:05 ` Chang S. Bae
2026-03-10 23:12 ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 02/16] KVM: x86: Refactor GPR accessors to differentiate register access types Chang S. Bae
2026-03-05 1:49 ` Sean Christopherson
2026-03-07 1:32 ` Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 03/16] KVM: x86: Implement accessors for extended GPRs Chang S. Bae
2026-03-05 1:41 ` Sean Christopherson
2026-03-07 1:32 ` Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 04/16] KVM: VMX: Introduce unified instruction info structure Chang S. Bae
2026-03-05 4:21 ` Sean Christopherson
2026-03-07 1:33 ` Chang S. Bae
2026-03-13 1:05 ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 05/16] KVM: VMX: Refactor instruction information retrieval Chang S. Bae
2026-01-12 23:53 ` [PATCH v2 06/16] KVM: VMX: Refactor GPR index retrieval from exit qualification Chang S. Bae
2026-03-05 4:13 ` Sean Christopherson
2026-01-12 23:53 ` [PATCH v2 07/16] KVM: VMX: Support extended register index in exit handling Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 08/16] KVM: nVMX: Propagate the extended instruction info field Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 09/16] KVM: emulate: Support EGPR accessing and tracking Chang S. Bae
2026-03-05 4:22 ` Sean Christopherson
2026-01-12 23:54 ` [PATCH v2 10/16] KVM: emulate: Handle EGPR index and REX2-incompatible opcodes Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 11/16] KVM: emulate: Support REX2-prefixed opcode decode Chang S. Bae
2026-01-12 23:54 ` Chang S. Bae [this message]
2026-01-12 23:54 ` [PATCH v2 13/16] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 14/16] KVM: x86: Expose APX foundational feature bit to guests Chang S. Bae
2026-01-19 5:55 ` Xiaoyao Li
2026-01-20 18:07 ` Edgecombe, Rick P
2026-01-20 20:50 ` Chang S. Bae
2026-01-21 19:59 ` Edgecombe, Rick P
2026-01-12 23:54 ` [PATCH v2 15/16] KVM: x86: Expose APX sub-features " Chang S. Bae
2026-01-12 23:54 ` [PATCH v2 16/16] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks Chang S. Bae
2026-03-05 4:28 ` Sean Christopherson
2026-03-07 1:33 ` Chang S. Bae
2026-03-11 18:42 ` Paolo Bonzini
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