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Tsirkin" , Wei Liu , Phil Dennis-Jordan , Peter Maydell , Zhao Liu , Paolo Bonzini Subject: [PATCH v3 20/37] whpx: i386: ignore vpassist when kernel-irqchip=off Date: Wed, 22 Apr 2026 23:42:08 +0200 Message-ID: <20260422214225.2242-21-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260422214225.2242-1-mohamed@unpredictable.fr> References: <20260422214225.2242-1-mohamed@unpredictable.fr> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-GUID: 5cRCVzpbtauORHHMFe00oue436sL8EHP X-Authority-Info-Out: v=2.4 cv=QJVlhwLL c=1 sm=1 tr=0 ts=69e940ef cx=c_apl:c_pps:t_out a=YrL12D//S6tul8v/L+6tKg==:117 a=YrL12D//S6tul8v/L+6tKg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=HmN67jXOOwgiugJlUbgA:9 X-Proofpoint-ORIG-GUID: 5cRCVzpbtauORHHMFe00oue436sL8EHP X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDIyMDIxMiBTYWx0ZWRfXxm8kEI6dczqo bb7nG8VjGgXgJZ2Eca196pXYoUZMkez8A5KT0Tk4Mo+NPm/kGwX2GfB9+/uH1ZdWz6sOtnoqQ8U g5QorsPU9BCmGkWAIIDp9QYcwCShwRjf5XQlY2N7WMwCJIfLoZpqNe9CF2L61dV4tPzInZ9ulO8 9Ss/oeGHEPIB/AOsFmuhM/02mCHQyrd9rhSULVXW+5u5SeXBdAp5fmgzxUQMb+uzFkUZIqBNY4z jR39s8bfn57LeAcXQlDDS0DckmSYJKD3El6cIvS5o+vmp6EWh3zCPBC4D3FnuTuiGMQ8mgNkHu0 KD18pZABajySuX5nYAjhoLgjmV/QFKDGL2wtj8u5QfT9W/PyD+Iz/TUizJX43c= Received-SPF: pass client-ip=57.103.76.77; envelope-from=mohamed@unpredictable.fr; helo=outbound.st.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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Linux tries to set vpassist even when none of the enlightenments using it are available. So ignore the page it sets. Signed-off-by: Mohamed Mediouni --- target/i386/whpx/whpx-all.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c index 521a94355d..cafcbf8bbb 100644 --- a/target/i386/whpx/whpx-all.c +++ b/target/i386/whpx/whpx-all.c @@ -51,6 +51,7 @@ #define HYPERV_APIC_BUS_FREQUENCY (200000000ULL) /* for kernel-irqchip=off */ #define HV_X64_MSR_APIC_FREQUENCY 0x40000023 +#define HV_X64_MSR_VP_ASSIST_PAGE 0x40000073 static bool is_modern_os = true; @@ -2118,6 +2119,18 @@ int whpx_vcpu_run(CPUState *cpu) } } } + + /* + * Linux tries to use it anyway even when not exposed. + * Ignore the write as the VP assist page is not used. + */ + if (vcpu->exit_ctx.MsrAccess.MsrNumber == HV_X64_MSR_VP_ASSIST_PAGE + && vcpu->exit_ctx.MsrAccess.AccessInfo.IsWrite + && !whpx_irqchip_in_kernel() + && whpx->hyperv_enlightenments_enabled) { + is_known_msr = 1; + } + /* * For all unsupported MSR access we: * ignore writes -- 2.50.1 (Apple Git-155)