From nobody Mon Feb 9 14:15:34 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E870723A9B3; Sun, 21 Dec 2025 04:31:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766291511; cv=none; b=uosAr6VZeuRCYcA1b/GEbylSHQ3B5BU1kEXIQjCo+mYGBynKE5gBNR6VnMS/AtcpWvvOkKJCCKfCVVRp8+EHFVHgDkVd6iVVCCH5aFPFb4p4gr51+Tam82Pj5dg/AEU9UZpCMyNTy69d8kB7d4QFRggd+SUwxkGMZwy5U4P6Oeo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766291511; c=relaxed/simple; bh=TRr5hcoQqdjYrW9FJSXg+9zaWcUsOZHBSl3b977kPuw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=f94sesB8QWeviIEjmVcJL2k41C830mFDL+QJ8mtq29IDLNrpQi+1PaG/Lk+fuoPBnd4aC3d5j0NlSNQyj5Hkdb9/Ny0EmVcIFSSGXCW/KGLih5vQsCoz9xhx7Ee+gkC0uaHf3dljkr2KJuq5ikDO/5eREu5/djfSPHMqtF5t4sU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=jWiFT+ku; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="jWiFT+ku" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1766291510; x=1797827510; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=TRr5hcoQqdjYrW9FJSXg+9zaWcUsOZHBSl3b977kPuw=; b=jWiFT+kuLhiD/GdEzuG1t1/71Tmrdx+Kod6lmzKyOP1TeM4vnYa+57ti baqn2gIOuwi0mo/Apudf16e2oFI9GK4b5pynRegY5iOzRB94xWtFyJN6V FIjxqhvZ95da+0sxMJq+vOrzsB/u8Ry5QNRp6Ev82MjoKnTiB/+fHUSC4 dlIykRWjE8yA8FUuXaYvSNHW5m5uOpYFVtU2oQDnsKtrKZ8ARRPUN/+Pf vZfE6TH67DrZZxWFVCE1a7ZLCDSw4IyK8JYNL39hDsDgxhN40vynsFGxy W/dnZGWrsf/0fl+ivEiYEL/iVZs0UBJq3uv/zOLI/icpYbbzpWnaJBUiH Q==; X-CSE-ConnectionGUID: f6H0yxtrR06UAujypjIPCw== X-CSE-MsgGUID: aQcs3AcbRj2yO6hMQxDXzw== X-IronPort-AV: E=McAfee;i="6800,10657,11635"; a="68132430" X-IronPort-AV: E=Sophos;i="6.20,256,1758610800"; d="scan'208";a="68132430" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Dec 2025 20:31:49 -0800 X-CSE-ConnectionGUID: z6EMDUA6RTyvjTwRP9myPg== X-CSE-MsgGUID: g3obFIl/TviXJC9sZsH2aw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,164,1763452800"; d="scan'208";a="229885037" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.172]) by orviesa002.jf.intel.com with ESMTP; 20 Dec 2025 20:31:50 -0800 From: "Chang S. Bae" 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 12/16] KVM: emulate: Reject EVEX-prefixed instructions Date: Sun, 21 Dec 2025 04:07:38 +0000 Message-ID: <20251221040742.29749-13-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251221040742.29749-1-chang.seok.bae@intel.com> References: <20251221040742.29749-1-chang.seok.bae@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Explicitly mark EVEX-prefixed opcodes (0x62) as unsupported. Signed-off-by: Chang S. Bae --- Changes since last version: * Rebase onto the recently merged VEX series. Reuse the previously existing VEX-rejection logic and style. --- 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 fc065ef53400..820ae381e601 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, v= oid *insn, int insn_len, int if (ctxt->d & NoRex && ctxt->rex_prefix =3D=3D REX2_PREFIX) opcode.flags =3D Undefined; =20 + /* EVEX-prefixed instructions are not implemented */ + if (ctxt->opcode_len =3D=3D 1 && ctxt->b =3D=3D 0x62 && + (mode =3D=3D X86EMUL_MODE_PROT64 || (ctxt->modrm & 0xc0) =3D=3D 0xc0)) + opcode.flags =3D NotImpl; + if (opcode.flags & ModRM) ctxt->modrm =3D insn_fetch(u8, ctxt); =20 --=20 2.51.0