From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 5B0693B7767; Wed, 29 Jul 2026 19:43:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785354234; cv=none; b=AISZVjRCCEDdFSdIuzLN1G6ARglykqWAYG2Dr5Hox7Ajki/LtbhqB7CYWHVNKzimo0Xw3dSWi0qKclNGIaNpKPo2IsAz3MQlR9AKwmMOpuDXUNyeWKqyxV/tm3D8bDG+lVgMQL3NMEIJAS2mEIZBiOtIs7VBsrlnmiqzmzEBVdw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785354234; c=relaxed/simple; bh=K0a43zC/CH1JRV9XZ9iaXKo0MS6XUMZZHsZPAiQ70Pc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=SZQUCYLWIfmpx3xOh1oo1ukpkrKYZ6MuOKIyqOgb1BscWCERUB5gSiVjitx4Z2/1c3vC4rNyO/uYo8xPf+wApG7FeUZN2WqYPlXVqlfRAkhj2YepNjKVi74sd35lXKBUxPr81jpOg/GFi8exW4RbfZcNRxcyp+TNmIKFpNM3NL8= 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=Ev8FRveT; arc=none smtp.client-ip=192.198.163.8 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="Ev8FRveT" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1785354230; x=1816890230; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=K0a43zC/CH1JRV9XZ9iaXKo0MS6XUMZZHsZPAiQ70Pc=; b=Ev8FRveT38Bl7/0w+rgylIU+KPmEleJTLOyr3dCRX5MgR9XqZoTgHcA4 BU5gwLFmPIHEec+KNaKSTCHfQOCNGGyI3FFcOmrsy3mR9pp6jhYgjN/rQ Ak3g4d2pt9WNB3MsfGyRMuemRioP9e0/BpLbopfCAXVBKXcnBMJS2VKPZ ZxHNOk0yQLUhSImPXuNhEppRhsl0pe6jRdYGOlQvy6koHtpyAR3IJEuu1 31fQIGnm7pMGaut5YDcoMPhDxnW8rrY/D6d3azJnQZoHIhJ5xjQyovBQj 9LgZhSt/+SQefvE2uEt880VEtxWnk1YH5LkgquT5cFICxPa6Xpnys70Rz Q==; X-CSE-ConnectionGUID: A4Gf5t6yTSuLXlPjgvjBWg== X-CSE-MsgGUID: XlGYOdYwT7SqwyZI4tIeQQ== X-IronPort-AV: E=McAfee;i="6800,10657,11859"; a="103508293" X-IronPort-AV: E=Sophos;i="6.25,193,1779174000"; d="scan'208";a="103508293" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 29 Jul 2026 12:43:29 -0700 X-CSE-ConnectionGUID: b+tWblBIREic0ms0IfrgeA== X-CSE-MsgGUID: 79mLAWJPRIqE9q77v65rIw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,193,1779174000"; d="scan'208";a="256769260" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.174]) by fmviesa007.fm.intel.com with ESMTP; 29 Jul 2026 12:43:28 -0700 From: "Chang S. Bae" 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 v6 13/20] KVM: x86: Reject EVEX-prefixed instructions Date: Wed, 29 Jul 2026 19:16:49 +0000 Message-ID: <20260729191656.598771-14-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260729191656.598771-1-chang.seok.bae@intel.com> References: <20260729191656.598771-1-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: 8bit 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 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