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, chang.seok.bae@intel.com
Subject: [PATCH v5 13/20] KVM: x86: Reject EVEX-prefixed instructions
Date: Mon, 20 Jul 2026 17:19:42 +0000 [thread overview]
Message-ID: <20260720171949.498680-14-chang.seok.bae@intel.com> (raw)
In-Reply-To: <20260720171949.498680-1-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 cb075bd74f76..fc7f9f17c1da 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -5045,6 +5045,11 @@ int x86_decode_insn(struct x86_emulate_ctxt *ctxt, void *insn, int insn_len, int
if (opcode.flags & ModRM)
ctxt->modrm = insn_fetch(u8, ctxt);
+ /* 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;
+
done_modrm:
ctxt->d = opcode.flags;
while (ctxt->d & GroupMask) {
--
2.53.0
next prev parent reply other threads:[~2026-07-20 17:46 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-20 17:19 [PATCH v5 00/20] KVM: x86: Enable APX for guests Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 01/20] KVM: x86: Extend VCPU registers for EGPRs Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 02/20] KVM: VMX: Save guest EGPRs in VCPU cache Chang S. Bae
2026-07-20 18:20 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 03/20] KVM: x86: Support APX state for XSAVE ABI Chang S. Bae
2026-07-20 18:22 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 04/20] KVM: VMX: Refactor VMX instruction information access Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 05/20] KVM: VMX: Refactor instruction information decoding Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 06/20] KVM: VMX: Remove unused control-register access defines Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 07/20] KVM: VMX: Refactor register index retrieval from exit qualification Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 08/20] KVM: VMX: Support instruction information extension Chang S. Bae
2026-07-20 18:12 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 09/20] KVM: nVMX: Propagate extended instruction information Chang S. Bae
2026-07-20 18:10 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 10/20] KVM: x86: Support EGPR accessing and tracking for emulator Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 11/20] KVM: x86: Handle EGPR index and REX2-incompatible opcodes Chang S. Bae
2026-07-20 18:18 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 12/20] KVM: x86: Support REX2-prefixed opcode decode Chang S. Bae
2026-07-20 17:19 ` Chang S. Bae [this message]
2026-07-20 18:11 ` [PATCH v5 13/20] KVM: x86: Reject EVEX-prefixed instructions sashiko-bot
2026-07-20 17:19 ` [PATCH v5 14/20] KVM: x86: Move KVM_SUPPORTED_{XCR0,XSS} into kvm_x86_vendor_init() Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 15/20] KVM: x86: Guard valid XCR0.APX settings Chang S. Bae
2026-07-20 17:19 ` [PATCH v5 16/20] KVM: x86: Add APX in supported XCR0 Chang S. Bae
2026-07-20 18:25 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 17/20] KVM: x86: Expose APX foundation feature to userspace Chang S. Bae
2026-07-20 18:12 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 18/20] KVM: x86: Expose APX sub-features " Chang S. Bae
2026-07-20 18:10 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 19/20] KVM: x86: selftests: Add APX state and ABI test Chang S. Bae
2026-07-20 18:17 ` sashiko-bot
2026-07-20 17:19 ` [PATCH v5 20/20] KVM: x86: selftests: Add APX state handling and XCR0 sanity checks Chang S. Bae
2026-07-21 7:09 ` [PATCH v5 00/20] KVM: x86: Enable APX for guests Paolo Bonzini
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