From nobody Mon Feb 9 13:36:42 2026 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.9]) (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 E8B59239E8D; Tue, 13 Jan 2026 00:18:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.9 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768263522; cv=none; b=mmV4CzhEssy6qanMFNnWNDRe4Yjn1FH39IYWEV31aETNYPiQZxIFWTuBvHgAPo2KNP5DundYJ8uDTx2G2ZNf2inQq4m55iAoqj1lwsk29Y3bsTkbdE5PwHM/qjnxA+felB5XlCBtZU+I4E6v9BNpsEM3Rq4TNQFaJ3xcfXeLytg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768263522; c=relaxed/simple; bh=07tJVhnezqFATaqeMdkaSGexLoth5B59/ayi8yiBDaQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=I5MlUUSPEXOCCXVkoYan6kSy72Bcaj9kAmnDFyrivwv4Fe2PM7onHebQuoINxvH0btMad+TOuVuX1Vu0aQRRI0D4cM1pM1TazrvKX2O29L9cIaptQO1kZkPS4SQUAjSaNtQ+7TG2fWDrvS4D763fYN6z6WtLrF2nRwYGREOAt4s= 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=ZlGNhldN; arc=none smtp.client-ip=192.198.163.9 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="ZlGNhldN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1768263521; x=1799799521; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=07tJVhnezqFATaqeMdkaSGexLoth5B59/ayi8yiBDaQ=; b=ZlGNhldNGfV8se8sagDaUCI79TJuMKtBCjNwc7qyGQuIT99krUBhaSvS DnWyzZhTyHQJ+N/0tLsSdZJqQsVslTnSaAVV+DvUzBPU9MGNR+mWI3fNc a0Bb1UxYSE0Yb9V1DdnxWNq9ch2w7VUNrYfI1BEcRCDDxjOZERo4FvWNb lNg+kfmu+4Ql33TNDXU5vEP6XDi1YYhYvBcVOAjPdBBrhC7FXGAUGr/qQ YdRMSZbSOoXhP1WBke5wA0GGzYcoqrYEfZ5kPfmrGYEhGaZ6713CO+/wP 0dSIPXoYzI7XSImYsoVQWFHVgUalWkVm7gUATemcR0yyrX6zrKeSnDHPh g==; X-CSE-ConnectionGUID: LaH5VquBRcGrKpOnMxZChg== X-CSE-MsgGUID: dJqSg2A0R1mFhxszceAqEw== X-IronPort-AV: E=McAfee;i="6800,10657,11669"; a="80264267" X-IronPort-AV: E=Sophos;i="6.21,222,1763452800"; d="scan'208";a="80264267" Received: from orviesa009.jf.intel.com ([10.64.159.149]) by fmvoesa103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Jan 2026 16:18:40 -0800 X-CSE-ConnectionGUID: 0XxsBxu6QCiI+cjd9k5a7w== X-CSE-MsgGUID: RQPZbfijRVWgBh5uhR5wMw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,222,1763452800"; d="scan'208";a="204042294" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.172]) by orviesa009.jf.intel.com with ESMTP; 12 Jan 2026 16:18:41 -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 v2 12/16] KVM: emulate: Reject EVEX-prefixed instructions Date: Mon, 12 Jan 2026 23:54:04 +0000 Message-ID: <20260112235408.168200-13-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260112235408.168200-1-chang.seok.bae@intel.com> References: <20260112235408.168200-1-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 --- 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, v= oid *insn, int insn_len, int if (ctxt->d & NoRex2 && 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