From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.17]) (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 6D328345738; Tue, 28 Apr 2026 05:26:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.17 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777353997; cv=none; b=aLV6ACHELPnPBL9bkRAXrwL8IU3BsWfq5RjGA7jA3PboiKV/b2jOKUj6+H8KQ3cfJKLpfoMWImODWmp9yanveVVZjXYJl10DViNDqZVwlPkEPsxDkZ1p+w8OZvY7SJPJ4aH2COY9bpUxLQCHl3pK2KH9PIm/HCpQhKdVoMU6niI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777353997; c=relaxed/simple; bh=bq3gC4SDa9NJv2wNWIJJzCLv/ofuVSA47dA3c9nxxxE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jpC2FVUaHUhE0ykhxdViEspdZBuJ+N3XjuqpHh3ji8KYlZicCMpLRu/RrR/BVNNEhIxGANeakkeCu8SVgjjztktdH9dP71sZctGo6O7/fLhihNSgAqkM3msDMNcdggqFd9eFzJIbf8Qeo9SfUBJLsjEQ51t9HuAj0a9uXyxU31Q= 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=Nq9zVjBL; arc=none smtp.client-ip=192.198.163.17 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="Nq9zVjBL" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1777353996; x=1808889996; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=bq3gC4SDa9NJv2wNWIJJzCLv/ofuVSA47dA3c9nxxxE=; b=Nq9zVjBLjxQrUGGpizscExphOzWZcSkLN0nz5bJk3OP8r2/vFf2MaSQa zsyK+gRaSwc5h07vqHcwSswSUiOHZuUpm7DwzzbRhPIPbDV1Ct8Yii30u 6cAXnyLciuzMunXCl6dzT9zZ/w5/2KS8FFbax6WjIK/KDV3GkEBXE9Dzv X05U3jid+Pdfj7YrIUOblbytRLbpP5kHKKgWhti9Ha+kcUr34RWXuoMNP wrGNthgxkdpBRBrOtIwUmZ05BXYju7GLethMN1nPcH3NWLHJnSo0lub7z MaTee41hXTZG1bCl47OHcYm7GJWW8NtmEqTmsIiP4mTDc8cUE5+cRUzwe w==; X-CSE-ConnectionGUID: dWHxYEzxTbq20yIqiazoPw== X-CSE-MsgGUID: 0s5KZu/gQomKv41/5DK3Wg== X-IronPort-AV: E=McAfee;i="6800,10657,11769"; a="78131736" X-IronPort-AV: E=Sophos;i="6.23,203,1770624000"; d="scan'208";a="78131736" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Apr 2026 22:26:32 -0700 X-CSE-ConnectionGUID: yLDY/Bk8SPW1eggc7IbohA== X-CSE-MsgGUID: ZFnbx9NSSJiyLMT91I7u6w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,203,1770624000"; d="scan'208";a="234130221" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.106]) by orviesa007.jf.intel.com with ESMTP; 27 Apr 2026 22:26:31 -0700 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 v3 15/20] KVM: x86: Reject EVEX-prefixed instructions Date: Tue, 28 Apr 2026 05:01:06 +0000 Message-ID: <20260428050111.39323-16-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260428050111.39323-1-chang.seok.bae@intel.com> References: <20260428050111.39323-1-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