{"id":2224856,"url":"http://patchwork.ozlabs.org/api/patches/2224856/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260418223320.51330-21-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":"<20260418223320.51330-21-mohamed@unpredictable.fr>","list_archive_url":null,"date":"2026-04-18T22:33:02","name":"[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/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260418223320.51330-21-mohamed@unpredictable.fr/mbox/","series":[{"id":500475,"url":"http://patchwork.ozlabs.org/api/series/500475/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=500475","date":"2026-04-18T22:32:54","name":"WHPX x86 updates for QEMU 11.1","version":1,"mbox":"http://patchwork.ozlabs.org/series/500475/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2224856/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2224856/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=P8ogNtW1;\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 4fymql2wC2z1yDF\n\tfor ; Sun, 19 Apr 2026 08:38:27 +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 1wEEF7-0006bP-L9; Sat, 18 Apr 2026 18:34:25 -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 1wEEEs-0006OR-Ql\n for qemu-devel@nongnu.org; Sat, 18 Apr 2026 18:34:15 -0400","from p-east2-cluster1-host8-snip4-10.eps.apple.com ([57.103.76.83]\n helo=outbound.st.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 1wEEEr-0004z9-0D\n for qemu-devel@nongnu.org; Sat, 18 Apr 2026 18:34:10 -0400","from outbound.st.icloud.com (unknown [127.0.0.2])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPS id\n EDB591800229; Sat, 18 Apr 2026 22:34:04 +0000 (UTC)","from localhost.localdomain (unknown [17.42.251.67])\n by p00-icloudmta-asmtp-us-east-1a-100-percent-1 (Postfix) with ESMTPSA id\n D68E618000DA; Sat, 18 Apr 2026 22:33:59 +0000 (UTC)"],"Dkim-Signature":"v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr;\n s=sig1; t=1776551646; x=1779143646;\n bh=shO+Mw/9k0xyNmUmIAPxgO00PEUmcfuq7ZIwrGpWZBo=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=P8ogNtW11uyTDugs6TN1DixQ9knSAh36dreSmanDPJrwJlcissnb4wW4ynTBReY8MYgxCvqdLsY43qlhLz2DF/5dCCe/xYmZGgx7ibycCrPHOj4EHg18m53euXWYBGxG/g/p1j/O0Q1YhbQlZ5ekllXyf1wr7HNGtv0JnoCYMTcZ30oI8K4Wi9LB3LBivtSoV1OVnVZ+/C2VKvTdW9KqVDv8o8LuGdrHJ7p1DZOZPa7oYm5/MhOIYPKs6Eo1hrnhFyGziFZDXQ2Gx2+0SWATY/She+ySAXHYfKil23+dd+pDq/qBv+Ht8IJFRSpxMBtykrXhRefCzNL0ufRgCAMMbA==","mail-alias-created-date":"1752046281608","From":"Mohamed Mediouni ","To":"qemu-devel@nongnu.org","Cc":"Mohamed Mediouni ,\n \"Michael S. Tsirkin\" , Paolo Bonzini ,\n Zhao Liu , Pedro Barbuda ,\n Roman Bolshakov , qemu-arm@nongnu.org,\n Pierrick Bouvier ,\n Peter Maydell , Wei Liu ,\n Phil Dennis-Jordan ","Subject":"[PATCH 20/38] whpx: i386: ignore vpassist when kernel-irqchip=off","Date":"Sun, 19 Apr 2026 00:33:02 +0200","Message-ID":"<20260418223320.51330-21-mohamed@unpredictable.fr>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20260418223320.51330-1-mohamed@unpredictable.fr>","References":"<20260418223320.51330-1-mohamed@unpredictable.fr>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-Proofpoint-GUID":"tb9FNmFn8VJuI6NQhH6jxdi83KenN05U","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDE4MDIyOCBTYWx0ZWRfX7bJaz0kMqF6b\n FqBOHAcGdHYBCrBcfWlfKYrqxighp0hbkgwhIzgR3GvG0U+w2E3FE3cEkWHrV8ofaqUkC9KqZXL\n NGlQNT91rSCiUiPPUf+2ypulP+l7OafLQ6HhrvaQWjPFQ5z7K0fnSeR295bRjOds3M5n1Bb/7qA\n LeRQas7snBaVuzjPa5KoZG2ZqBRSScO/O0vl/sDV+xSD1FCJoNqbiEzcYLzKBmUludiKaYuVgSq\n PCwtT881cr5oJgukgfwnvYptV3kb0Gwrln3ckju7+Eet+PPvhz3xZgm3aOBJldQ5Bn8yOUfQnmD\n XAwHO2p6wleCA4S6XagyeGNYehLv6zw4L7yhm0IVx2BXcec3cPHHso2+UU1Ihc=","X-Authority-Info-Out":"v=2.4 cv=D8ZK6/Rj c=1 sm=1 tr=0 ts=69e406de\n cx=c_apl:c_pps:t_out a=YrL12D//S6tul8v/L+6tKg==:117\n a=YrL12D//S6tul8v/L+6tKg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22\n a=HmN67jXOOwgiugJlUbgA:9","X-Proofpoint-ORIG-GUID":"tb9FNmFn8VJuI6NQhH6jxdi83KenN05U","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=2026-04-18_06,2026-04-17_04,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=notspam policy=default score=0 bulkscore=0\n suspectscore=0 clxscore=1030 adultscore=0 mlxlogscore=999 spamscore=0\n phishscore=0 mlxscore=0 malwarescore=0 lowpriorityscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604180228","Received-SPF":"pass client-ip=57.103.76.83;\n envelope-from=mohamed@unpredictable.fr; helo=outbound.st.icloud.com","X-Spam_score_int":"-27","X-Spam_score":"-2.8","X-Spam_bar":"--","X-Spam_report":"(-2.8 / 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_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001,\n SPF_PASS=-0.001 autolearn=unavailable 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":["20/38"]}