{"id":2225065,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2225065/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260420104248.86702-21-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":"<20260420104248.86702-21-mohamed@unpredictable.fr>","date":"2026-04-20T10:42:30","name":"[v2,20/38] 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/1.1/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260420104248.86702-21-mohamed@unpredictable.fr/mbox/","series":[{"id":500592,"url":"http://patchwork.ozlabs.org/api/1.1/series/500592/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500592","date":"2026-04-20T10:42:10","name":"WHPX x86 updates for QEMU 11.1","version":2,"mbox":"http://patchwork.ozlabs.org/series/500592/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2225065/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2225065/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=NCBBg+/i;\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 4fzhvR3jzWz1yHr\n\tfor ; Mon, 20 Apr 2026 20:44:51 +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 1wEm6Y-0007JP-K5; Mon, 20 Apr 2026 06:43:50 -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 1wEm6W-0007FF-9W\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 06:43:48 -0400","from p-west3-cluster6-host9-snip4-6.eps.apple.com ([57.103.75.89]\n helo=outbound.ms.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 1wEm6U-0000et-Tk\n for qemu-devel@nongnu.org; Mon, 20 Apr 2026 06:43:48 -0400","from outbound.ms.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-west-3a-100-percent-1 (Postfix) with ESMTPS id\n D057F1800451; Mon, 20 Apr 2026 10:43:43 +0000 (UTC)","from localhost.localdomain (unknown [17.57.154.37])\n by p00-icloudmta-asmtp-us-west-3a-100-percent-1 (Postfix) with ESMTPSA id\n 3A08B18000BC; Mon, 20 Apr 2026 10:43:41 +0000 (UTC)"],"Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776681826; x=1779273826;\n bh=shO+Mw/9k0xyNmUmIAPxgO00PEUmcfuq7ZIwrGpWZBo=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=NCBBg+/i1VrdTr2Wl/nRuZP8CDUUhwgqxRh1QMxiYtbCjJajg9tVZeepbXlooul4Jd314+60OfXf0QqWnPDDJXL/vTOcdysPv7l6w8dQUl/UJphkJBx+Rl5I20lldlkCK2N8dtHuucN8fbzm1jNpyIrc413/LVh0lSDTTnN9/ry9krn2HIzdT0LXV0tW/2B6nrPP6rSwFbMSuXzxVWxuxpaY77h4q4nkc0rnfUnYih0M9CKEsMI5cued/C71YHS2YSH+qs9IF2SQrFUaNX1Mr0iP3gwBNWecmscsjpsEiqh86YMJyWQTsI2HmSvNU7kWCcMqbg1ia/JbjDK39fXwzg==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"qemu-arm@nongnu.org, Mohamed Mediouni ,\n Paolo Bonzini ,\n Phil Dennis-Jordan ,\n Roman Bolshakov ,\n Pierrick Bouvier ,\n Pedro Barbuda , Wei Liu ,\n \"Michael S. Tsirkin\" ,\n Peter Maydell , Zhao Liu ","Subject":"[PATCH v2 20/38] whpx: i386: ignore vpassist when kernel-irqchip=off","Date":"Mon, 20 Apr 2026 12:42:30 +0200","Message-ID":"<20260420104248.86702-21-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260420104248.86702-1-mohamed@unpredictable.fr>","References":"<20260420104248.86702-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDIwMDEwNCBTYWx0ZWRfXxXZDVTjV9PDw\n AzFXFt01KBczUo966IMt8gD8NgpnZ+r9XEkh4+iyCA4fz4Z0QlIbjbXViXMbMgznwJyYeLvZ5i1\n /3Yh8xal579oDkg0phx1AvDGw3Yq2/JAQR4m2hoHyICkCJ8JHpM6TKu0ohGH2l3XgTgJXb+rTot\n bHT87LalwIwkg/vMwNmirBtpgyWliP3F/o29eauYwLhDJdNC8uxW/QSaeUNRhKWhd3f8LsAvs2o\n 8GzRQ3ZXa5hAnD1gxpqbljDF7Inbltx/V/NIrRR8mlCuG7uJqwl0yLPOtuW0MIEIWFo2nxxdd/g\n 5O16qEzTkFQN3Dx0NnLNq5BBrGG0SxxJU1l1vHKbvHmR7GIUakj6WbDTDs2eYw=","X-Proofpoint-GUID":"L0hv3xy8QT-c52lr9bVOXfFmy1Idvtek","X-Authority-Info-Out":"v=2.4 cv=CeMFJbrl c=1 sm=1 tr=0 ts=69e60360\n cx=c_apl:c_pps:t_out a=qkKslKyYc0ctBTeLUVfTFg==:117 a=A5OVakUREuEA:10\n a=VkNPw1HP01LnGYTKEx00:22 a=HmN67jXOOwgiugJlUbgA:9","X-Proofpoint-ORIG-GUID":"L0hv3xy8QT-c52lr9bVOXfFmy1Idvtek","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=2026-04-20_02,2026-04-17_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0 spamscore=0\n lowpriorityscore=0 phishscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999\n clxscore=1030 bulkscore=0 suspectscore=0 adultscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604200104","Received-SPF":"pass client-ip=57.103.75.89;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.ms.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 SPF_HELO_PASS=-0.001,\n 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 f31eabce37..3af5f936d4 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":["v2","20/38"]}