{"id":2223528,"url":"http://patchwork.ozlabs.org/api/patches/2223528/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260415132926.58878-6-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":"<20260415132926.58878-6-mohamed@unpredictable.fr>","list_archive_url":null,"date":"2026-04-15T13:29:21","name":"[v2,05/10] 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/20260415132926.58878-6-mohamed@unpredictable.fr/mbox/","series":[{"id":499989,"url":"http://patchwork.ozlabs.org/api/series/499989/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499989","date":"2026-04-15T13:29:20","name":"whpx: i386: Some more changes","version":2,"mbox":"http://patchwork.ozlabs.org/series/499989/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2223528/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2223528/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=gbXNdBDE;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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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":["v2","05/10"]}