From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 53E75361658; Tue, 12 May 2026 01:40:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778550039; cv=none; b=sAfwxDkjs9wSH5BHDGYArLlrcOGhvuU4dpXui6f3RS1DOcX72CxOXcPIpc8HKzxPTnL6NELkr0jOvCgalu4ZxrxdjXXLEtWZrERg1BJvQlpU4LpwVm1Xe2Er+WA1DSxuAQAYTkao/0lcmcyfRHuGcZSw641loTH2BUfiOQlV0aM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778550039; c=relaxed/simple; bh=bq3gC4SDa9NJv2wNWIJJzCLv/ofuVSA47dA3c9nxxxE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eNDIMP5cO13hNc+iusv4VJaG2U1w4xPbgYZ9Rg+yrYoAizRICYD907UEZc9ZS9cBBWcQCnYa7Dmi4Zh4q461SQO1UejabW9tncPIKPHXMxM3xP1Od6jTOkIK127up0ICr4+ptCq4QUsPv1+eA5LBwVWsYvXAzE7ityZ6l3vrmSo= 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=ATLaedC5; arc=none smtp.client-ip=198.175.65.14 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="ATLaedC5" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1778550035; x=1810086035; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bq3gC4SDa9NJv2wNWIJJzCLv/ofuVSA47dA3c9nxxxE=; b=ATLaedC5L7uwBl3Begyx44DFh4fhCa2PDBVlbP6gjb/nEW90a40Nt/1Q 6tfJpyC7LdnuWyPI/5NnWUrQJ546yVeAkn7S8uENU/DQEqL8mMnPIHrIM FtPdCmKNku0WXNxTdiNqxESadDDkTgvV2ZPYRuW6zLeN1v97dK0BCQkoU dBx+phU3wyjPgIB+j0EiBn776r3el6U31WyD7OF27WWkfB3xubGgtEccp eL1+CrVTOsIsrd0E52hIGar3kE+cASB8QKrznuNaDHw0sCtTpKO9otMej JAGAmgpcp3AeIQb4oG5SBxZ9jY4+EGm0eHLxsz1zEBMmD0btYHcB+uBnl g==; X-CSE-ConnectionGUID: KQwLk3xxRjW/LIgU1Cdy0Q== X-CSE-MsgGUID: k/ioZpV+QyWkwloRpLQezA== X-IronPort-AV: E=McAfee;i="6800,10657,11783"; a="83322177" X-IronPort-AV: E=Sophos;i="6.23,230,1770624000"; d="scan'208";a="83322177" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2026 18:40:30 -0700 X-CSE-ConnectionGUID: nzERAiUeQnSQUJz5NMZWoQ== X-CSE-MsgGUID: 5Oj/urJ0QBicOaIreLNrsw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,230,1770624000"; d="scan'208";a="234572821" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.106]) by fmviesa007.fm.intel.com with ESMTP; 11 May 2026 18:40:30 -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, chao.gao@intel.com, chang.seok.bae@intel.com Subject: [PATCH v4 16/21] KVM: x86: Reject EVEX-prefixed instructions Date: Tue, 12 May 2026 01:14:57 +0000 Message-ID: <20260512011502.53072-17-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260512011502.53072-1-chang.seok.bae@intel.com> References: <20260512011502.53072-1-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 efe8adca1317..31118ae3b6a1 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -5052,6 +5052,11 @@ 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