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Tsirkin" , 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 AzFXFt01KBczUo966IMt8gD8NgpnZ+r9XEkh4+iyCA4fz4Z0QlIbjbXViXMbMgznwJyYeLvZ5i1 /3Yh8xal579oDkg0phx1AvDGw3Yq2/JAQR4m2hoHyICkCJ8JHpM6TKu0ohGH2l3XgTgJXb+rTot bHT87LalwIwkg/vMwNmirBtpgyWliP3F/o29eauYwLhDJdNC8uxW/QSaeUNRhKWhd3f8LsAvs2o 8GzRQ3ZXa5hAnD1gxpqbljDF7Inbltx/V/NIrRR8mlCuG7uJqwl0yLPOtuW0MIEIWFo2nxxdd/g 5O16qEzTkFQN3Dx0NnLNq5BBrGG0SxxJU1l1vHKbvHmR7GIUakj6WbDTDs2eYw= X-Proofpoint-GUID: L0hv3xy8QT-c52lr9bVOXfFmy1Idvtek X-Authority-Info-Out: v=2.4 cv=CeMFJbrl c=1 sm=1 tr=0 ts=69e60360 cx=c_apl:c_pps:t_out a=qkKslKyYc0ctBTeLUVfTFg==:117 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=HmN67jXOOwgiugJlUbgA:9 X-Proofpoint-ORIG-GUID: L0hv3xy8QT-c52lr9bVOXfFmy1Idvtek X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 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 lowpriorityscore=0 phishscore=0 malwarescore=0 mlxscore=0 mlxlogscore=999 clxscore=1030 bulkscore=0 suspectscore=0 adultscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2604200104 Received-SPF: pass client-ip=57.103.75.115; 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, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=unavailable 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 f31eabce37..3af5f936d4 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; @@ -2033,6 +2034,18 @@ 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)