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Tsirkin" , Peter Maydell , Zhao Liu Subject: [PATCH v2 10/38] whpx: i386: disable kernel-irqchip on Windows 10 when PIC enabled Date: Mon, 20 Apr 2026 12:42:20 +0200 Message-ID: <20260420104248.86702-11-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: AW1haW4tMjYwNDIwMDEwNCBTYWx0ZWRfXzxGCLb8ASQoQ SYU71lPx4nmuOcMfWAB1tx6aCdCg6L1NDmSNCirQ4tV2BaytKUjE9aXfWWOLTqBoMlL3z1HhNeo kYKhFztiagk3QxcEdC7ikZp4fPg2uxigkaqdoXVNfmRyA7psK7GtH3yMyyApco31FrkP1Ak/Rbr Rt5VDqjosQGcd4kdGl3NVmSvz5iPiXLEQukDWcgYe1xcEabO0QLX8Va+XIgO5lnLM0XiHvjDqol QNxGLaxq3U2dIQ/drT/U7W9PQnNEK7rJkj48QZTUT0zTBxsN0hWV93CMHQvqQ79ag38iO11bTy8 SwQ878cWW3RFYqnUHfxdKi+y13pNoYNKfM7HTjijTm5df68Oyg0bsOHHJ+a8CU= X-Authority-Info-Out: v=2.4 cv=Dbcaa/tW c=1 sm=1 tr=0 ts=69e60348 cx=c_apl:c_pps:t_out a=qkKslKyYc0ctBTeLUVfTFg==:117 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=nUl_a9z44qMLw6SsMv4A:9 X-Proofpoint-GUID: znvfjnvsgZKLosfzKUnJ4GMbCvMv_mcD X-Proofpoint-ORIG-GUID: znvfjnvsgZKLosfzKUnJ4GMbCvMv_mcD 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 clxscore=1030 adultscore=0 malwarescore=0 suspectscore=0 mlxlogscore=867 mlxscore=0 lowpriorityscore=0 phishscore=0 bulkscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2604200104 Received-SPF: pass client-ip=57.103.72.108; 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 Move WHvCapabilityCodeProcessorPerfmonFeatures queries as that's how we distinguish if on a legacy OS. Now that Windows guests are booting, disable kernel-irqchip=on by default for Windows 10 when the PIC is enabled. Signed-off-by: Mohamed Mediouni --- target/i386/whpx/whpx-all.c | 69 +++++++++++++++++++++---------------- 1 file changed, 39 insertions(+), 30 deletions(-) diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c index 03f490804b..4d1a151db5 100644 --- a/target/i386/whpx/whpx-all.c +++ b/target/i386/whpx/whpx-all.c @@ -2447,6 +2447,13 @@ int whpx_accel_init(AccelState *as, MachineState *ms) 0x8000000A, 0x80000021, 0x80000022, 0xC0000000, 0xC0000001}; UINT32 cpuidExitList_legacy_os[] = {1, 0x40000000, 0x40000001, 0x40000010}; + X86MachineState *x86ms = X86_MACHINE(ms); + bool pic_enabled = false; + + if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) { + pic_enabled = true; + } + whpx = &whpx_global; if (!init_whp_dispatch()) { @@ -2518,6 +2525,35 @@ int whpx_accel_init(AccelState *as, MachineState *ms) goto error; } + /* Enable supported performance monitoring capabilities */ + hr = whp_dispatch.WHvGetCapability( + WHvCapabilityCodeProcessorPerfmonFeatures, &perfmon_features, + sizeof(WHV_PROCESSOR_PERFMON_FEATURES), &whpx_cap_size); + /* + * Relying on this is a crutch to maintain Windows 10 support. + * + * WHvCapabilityCodeProcessorPerfmonFeatures and + * WHvPartitionPropertyCodeSyntheticProcessorFeaturesBanks + * are implemented starting from Windows Server 2022 (build 20348). + */ + if (FAILED(hr)) { + warn_report("WHPX: Failed to get performance " + "monitoring features, hr=%08lx", hr); + is_modern_os = false; + } else { + hr = whp_dispatch.WHvSetPartitionProperty( + whpx->partition, + WHvPartitionPropertyCodeProcessorPerfmonFeatures, + &perfmon_features, + sizeof(WHV_PROCESSOR_PERFMON_FEATURES)); + if (FAILED(hr)) { + error_report("WHPX: Failed to set performance " + "monitoring features, hr=%08lx", hr); + ret = -EINVAL; + goto error; + } + } + /* * Error out if WHP doesn't support apic emulation and user is requiring * it. @@ -2530,8 +2566,9 @@ int whpx_accel_init(AccelState *as, MachineState *ms) goto error; } - if (whpx->kernel_irqchip_allowed && features.LocalApicEmulation && - whp_dispatch.WHvSetVirtualProcessorInterruptControllerState2) { + if (whpx->kernel_irqchip_allowed && !(whpx_is_legacy_os() && pic_enabled + && !whpx->kernel_irqchip_required) && features.LocalApicEmulation + && whp_dispatch.WHvSetVirtualProcessorInterruptControllerState2) { WHV_X64_LOCAL_APIC_EMULATION_MODE mode = WHvX64LocalApicEmulationModeX2Apic; hr = whp_dispatch.WHvSetPartitionProperty( @@ -2590,34 +2627,6 @@ int whpx_accel_init(AccelState *as, MachineState *ms) goto error; } - /* Enable supported performance monitoring capabilities */ - hr = whp_dispatch.WHvGetCapability( - WHvCapabilityCodeProcessorPerfmonFeatures, &perfmon_features, - sizeof(WHV_PROCESSOR_PERFMON_FEATURES), &whpx_cap_size); - /* - * Relying on this is a crutch to maintain Windows 10 support. - * - * WHvCapabilityCodeProcessorPerfmonFeatures and - * WHvPartitionPropertyCodeSyntheticProcessorFeaturesBanks - * are implemented starting from Windows Server 2022 (build 20348). - */ - if (FAILED(hr)) { - warn_report("WHPX: Failed to get performance " - "monitoring features, hr=%08lx", hr); - is_modern_os = false; - } else { - hr = whp_dispatch.WHvSetPartitionProperty( - whpx->partition, - WHvPartitionPropertyCodeProcessorPerfmonFeatures, - &perfmon_features, - sizeof(WHV_PROCESSOR_PERFMON_FEATURES)); - if (FAILED(hr)) { - error_report("WHPX: Failed to set performance " - "monitoring features, hr=%08lx", hr); - ret = -EINVAL; - goto error; - } - } /* Enable synthetic processor features */ WHV_SYNTHETIC_PROCESSOR_FEATURES_BANKS synthetic_features; -- 2.50.1 (Apple Git-155)