{"id":2222760,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2222760/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260413152326.63738-14-mohamed@unpredictable.fr/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260413152326.63738-14-mohamed@unpredictable.fr>","date":"2026-04-13T15:23:25","name":"[v10,13/14] hw/intc: apic: disallow APIC reads when disabled","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"6585ef04a1f1285be77ac67d756710ee109417b2","submitter":{"id":91318,"url":"http://patchwork.ozlabs.org/api/1.1/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260413152326.63738-14-mohamed@unpredictable.fr/mbox/","series":[{"id":499721,"url":"http://patchwork.ozlabs.org/api/1.1/series/499721/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499721","date":"2026-04-13T15:23:12","name":"whpx: i386: bug fixes, feature probing and CPUID","version":10,"mbox":"http://patchwork.ozlabs.org/series/499721/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2222760/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2222760/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=FZyetyY4;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fvWSr4HvCz1xtJ\n\tfor ; Tue, 14 Apr 2026 01:25:48 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wCJ90-00063a-Er; Mon, 13 Apr 2026 11:24:10 -0400","from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1wCJ8n-0005cA-Uc\n for qemu-devel@nongnu.org; Mon, 13 Apr 2026 11:23:59 -0400","from qs-2005h-snip4-2.eps.apple.com ([57.103.86.203]\n helo=outbound.qs.icloud.com)\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1wCJ8k-0000Wf-2K\n for qemu-devel@nongnu.org; Mon, 13 Apr 2026 11:23:56 -0400","from outbound.qs.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-10 (Postfix) with ESMTPS id\n 2D42D1800111; Mon, 13 Apr 2026 15:23:49 +0000 (UTC)","from localhost.localdomain (unknown [17.57.155.37])\n by p00-icloudmta-asmtp-us-east-2d-100-percent-10 (Postfix) with ESMTPSA id\n DB9A61800103; Mon, 13 Apr 2026 15:23:47 +0000 (UTC)"],"Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776093833; x=1778685833;\n bh=SCqUAJvB1zqKRh44vHU0QIqywz/suuWsKXqtx/ZiPkM=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=FZyetyY44Ph+mBFSFnmmiKimJ/NmiyZ5O+zcTbVejoorf4EEJuAXcXrC145Mp19c0kEUcAUgn6uFGwTfVAubwxMqEbPxxTwoCIOQEOTHQwCDtyDBTA21jn8+JmLAWkMzGm1275XU3eIXMeX0bls10iMp+9jo4HQlqxmsAcYVzdcYk95YsVm0VsHS4ssijXa8QDxyltt4tvxlkdJzrMnSZ3At9hI/TQBB5jf4hnYac3HHrGTO+csoMj23TWoHVC3fQR64ZtIO9LCcka+ZqEja/sD6oAMJvLBucHRLcmXh8tCIgRYW8kWvaGHoYjvDo/AVRykazZfIgjK1Zrd2/vAJjQ==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"Zhao Liu , \"Michael S. Tsirkin\" ,\n Paolo Bonzini , Wei Liu ,\n Roman Bolshakov ,\n Pedro Barbuda ,\n Mohamed Mediouni ,\n Phil Dennis-Jordan ","Subject":"[PATCH v10 13/14] hw/intc: apic: disallow APIC reads when disabled","Date":"Mon, 13 Apr 2026 17:23:25 +0200","Message-ID":"<20260413152326.63738-14-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260413152326.63738-1-mohamed@unpredictable.fr>","References":"<20260413152326.63738-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-GUID":"jo6XZAgya5S1hpQad2hJpOZgwLCtAGsV","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDEzMDE1MSBTYWx0ZWRfX5Eq1l4INaBew\n OZ86TkVTmiIvuuUibuyzHNYeVBVbA3oLT7xtz2oX6j8w2HO++qiAKYPT8D69n14YRycoZBJY1WI\n fcxxhGa76LqGDJDkbZ2WeOhCW/Xaxt8yyIclfjH/sxlW6K3DkuRckejKWJ3Vye3Oc6Ha4Kupvdx\n pJeFMtEzEyRH091c9n0ba+LLc0PtM9z3gozXK8CiqHGgEO2yqVNW6WAHA9fz+qgr/87/rx845Nd\n sCsSSueiIh4xJChu+P/FwAQWQx3QaIYi0gCbxziVKAQ0/H5ovLK5YBs8oAcjKou33deWx+2mn75\n ouU3yNv4phv6CnE8RevtVE6XQjxWUVsSCrBEY7oH1kyQCryDGjQi3yS5WvXZKA=","X-Proofpoint-ORIG-GUID":"jo6XZAgya5S1hpQad2hJpOZgwLCtAGsV","X-Authority-Info-Out":"v=2.4 cv=HdsZjyE8 c=1 sm=1 tr=0 ts=69dd0a87\n cx=c_apl:c_pps:t_out a=bsP7O+dXZ5uKcj+dsLqiMw==:117\n a=bsP7O+dXZ5uKcj+dsLqiMw==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=Sz3nRv2TKcqVAncp5HQA:9","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-13_03,2026-04-13_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0 malwarescore=0\n spamscore=0 mlxscore=0 adultscore=0 phishscore=0\n suspectscore=0 clxscore=1030\n mlxlogscore=800 bulkscore=0 lowpriorityscore=0 classifier=spam authscore=0\n adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604130151","Received-SPF":"pass client-ip=57.103.86.203;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.icloud.com","X-Spam_score_int":"-20","X-Spam_score":"-2.1","X-Spam_bar":"--","X-Spam_report":"(-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"!APICBASE_ENABLE + attempting to read xAPIC registers is not an allowed combination.\n\nAnd neither is x2APIC enabled + attempting to read xAPIC registers\n\nSigned-off-by: Mohamed Mediouni \n---\n hw/intc/apic.c | 9 +++++++++\n 1 file changed, 9 insertions(+)","diff":"diff --git a/hw/intc/apic.c b/hw/intc/apic.c\nindex 8766ed00b9..c09dddef39 100644\n--- a/hw/intc/apic.c\n+++ b/hw/intc/apic.c\n@@ -875,6 +875,15 @@ static uint64_t apic_mem_read(void *opaque, hwaddr addr, unsigned size)\n return -1;\n }\n \n+ /* if the xAPIC is disabled, return early. */\n+ if (!(s->apicbase & MSR_IA32_APICBASE_ENABLE)) {\n+ return 0xffffffff;\n+ }\n+\n+ if (s->apicbase & MSR_IA32_APICBASE_EXTD) {\n+ return 0xffffffff;\n+ }\n+\n index = (addr >> 4) & 0xff;\n apic_register_read(s, index, &val);\n \n","prefixes":["v10","13/14"]}