{"id":2223228,"url":"http://patchwork.ozlabs.org/api/patches/2223228/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414182231.18776-6-mohamed@unpredictable.fr/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/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":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260414182231.18776-6-mohamed@unpredictable.fr>","list_archive_url":null,"date":"2026-04-14T18:22:29","name":"[5/7] whpx: i386: ignore vpassist when kernel-irqchip=off","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"ee8b2e68ab0867d7af7652aa8ac7b496543e3168","submitter":{"id":91318,"url":"http://patchwork.ozlabs.org/api/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260414182231.18776-6-mohamed@unpredictable.fr/mbox/","series":[{"id":499883,"url":"http://patchwork.ozlabs.org/api/series/499883/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499883","date":"2026-04-14T18:22:24","name":"whpx: i386: Some more changes","version":1,"mbox":"http://patchwork.ozlabs.org/series/499883/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223228/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223228/checks/","tags":{},"related":[],"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=Qb6rj1lB;\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 4fwCP36tP3z1y2d\n\tfor ; Wed, 15 Apr 2026 04:24:55 +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 1wCiPh-00069H-3s; Tue, 14 Apr 2026 14:23:05 -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 1wCiPR-00066X-CG\n for qemu-devel@nongnu.org; Tue, 14 Apr 2026 14:22:50 -0400","from pv-2005c-snip4-8.eps.apple.com ([57.103.66.159]\n helo=outbound.pv.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 1wCiPP-0006UV-SF\n for qemu-devel@nongnu.org; Tue, 14 Apr 2026 14:22:49 -0400","from outbound.pv.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPS id\n 7A36618017A2; Tue, 14 Apr 2026 18:22:44 +0000 (UTC)","from localhost.localdomain (unknown [17.56.9.36])\n by p00-icloudmta-asmtp-us-west-1a-60-percent-9 (Postfix) with ESMTPSA id\n 8A90018001DB; Tue, 14 Apr 2026 18:22:42 +0000 (UTC)"],"Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776190966; x=1778782966;\n bh=aHWbpBbWHa1pDSLj1H1tPnDt0duRVaN6KSal90efVe4=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=Qb6rj1lBiQ/fdp5uLcQDat9lsIv+cNCd87KS0lhUkjC+XKe1dnpYA5WjxmxhwhQBGCH5lwonCc0GcXx5z5Dhgm1mfBWExY8HeGo+BVSE6Fpf2eHoCuevcXQPChWeCtUDIpM7sHbdHh+mqUVKBaO0VIyOAUZq56zvsu01PGmJcZBmZ4PzFhupx923bkptehA8DngYBS71BV6jBITQZ7otrerF+GFhnruSkOIfaX+1uHYYFkOSbhb4fajCK2bBupxf8QGaSvOfDPxkMJMldI3tnjY+I07jt0LhLAucamWdFphtQarWgBkOXxabNF4QjT8D14xDPn1+PF4OxW0ovlqLsg==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"Pedro Barbuda ,\n Mohamed Mediouni ,\n Zhao Liu , Paolo Bonzini ","Subject":"[PATCH 5/7] whpx: i386: ignore vpassist when kernel-irqchip=off","Date":"Tue, 14 Apr 2026 20:22:29 +0200","Message-ID":"<20260414182231.18776-6-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260414182231.18776-1-mohamed@unpredictable.fr>","References":"<20260414182231.18776-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Authority-Info-Out":"v=2.4 cv=c4GmgB9l c=1 sm=1 tr=0 ts=69de85f5\n cx=c_apl:c_pps:t_out a=azHRBMxVc17uSn+fyuI/eg==:117\n a=azHRBMxVc17uSn+fyuI/eg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=HmN67jXOOwgiugJlUbgA:9","X-Proofpoint-GUID":"QPG1F_s5cYYfRUAsDQuBJrokPb-16-MJ","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDE0MDE3MiBTYWx0ZWRfX6kukinN5p/0H\n x3+9bBgOCuEvOQnUVQgu1MZ7OiS5dCwJUH7SjZ1hcjLctr8ihGMWa645Eok+zNDSAIga8uUKM6X\n U4MXogQDE2vm0qdJRtHndeAUGqQQ3ROyDmzJCqEvGm7o/8KvmP+QMuBJyOOvYb2YwNKnGALgSxA\n aoWN/wW+SRiAi22OgO54VBq6nQIznWXmdYCG3/zS894ARqPPi695uSNuxqsXydGRszo/vxI/Rpn\n Nv4pBdhLIXDPPyDOszszaj8unY91AylFxu0sHl/nv39pzcBJ+2tvKIO2McJBhc4MWOsOrsErTX+\n FvO4O6i7ABUPi7xtnALasZwh+0FNE9GDjImu8olFi9MGx97Oauf6l0mPYpC2VQ=","X-Proofpoint-ORIG-GUID":"QPG1F_s5cYYfRUAsDQuBJrokPb-16-MJ","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=2026-04-14_03,2026-04-13_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0 adultscore=0\n bulkscore=0 spamscore=0 phishscore=0 suspectscore=0 clxscore=1030\n malwarescore=0 lowpriorityscore=0 mlxlogscore=999 mlxscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604140172","Received-SPF":"pass client-ip=57.103.66.159;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.pv.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":"Linux tries to set vpassist even when none of the enlightenments\nusing it are available.\n\nSo ignore the page it sets.\n\nSigned-off-by: Mohamed Mediouni \n---\n target/i386/whpx/whpx-all.c | 13 +++++++++++++\n 1 file changed, 13 insertions(+)","diff":"diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 6c39168b06..2e6679f40b 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -51,6 +51,7 @@\n #define HYPERV_APIC_BUS_FREQUENCY (200000000ULL)\n /* for kernel-irqchip=off */\n #define HV_X64_MSR_APIC_FREQUENCY 0x40000023\n+#define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073\n \n static bool is_modern_os = true;\n \n@@ -2033,6 +2034,18 @@ int whpx_vcpu_run(CPUState *cpu)\n }\n }\n }\n+\n+ /*\n+ * Linux tries to use it anyway even when not exposed. \n+ * Ignore the write as the VP assist page is not used.\n+ */\n+ if (vcpu->exit_ctx.MsrAccess.MsrNumber == HV_X64_MSR_VP_ASSIST_PAGE\n+ && vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite\n+ && !whpx_irqchip_in_kernel()\n+ && whpx->hyperv_enlightenments_enabled) {\n+ is_known_msr = 1;\n+ }\n+\n /*\n * For all unsupported MSR access we:\n * ignore writes\n","prefixes":["5/7"]}