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GET /api/1.2/patches/2219855/?format=api
{ "id": 2219855, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219855/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260405023409.23142-11-mohamed@unpredictable.fr/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.2/projects/14/?format=api", "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": "<20260405023409.23142-11-mohamed@unpredictable.fr>", "list_archive_url": null, "date": "2026-04-05T02:34:08", "name": "[v7,10/11] whpx: i386: disable kernel-irqchip on Windows 10 when PIC enabled", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4c52cea858ed54c38b42b962ea42d6aeb03f3cd3", "submitter": { "id": 91318, "url": "http://patchwork.ozlabs.org/api/1.2/people/91318/?format=api", "name": "Mohamed Mediouni", "email": "mohamed@unpredictable.fr" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260405023409.23142-11-mohamed@unpredictable.fr/mbox/", "series": [ { "id": 498757, "url": "http://patchwork.ozlabs.org/api/1.2/series/498757/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=498757", "date": "2026-04-05T02:34:08", "name": "whpx: i386: bug fixes, feature probing and CPUID", "version": 7, "mbox": "http://patchwork.ozlabs.org/series/498757/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219855/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219855/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass 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bh=RaP/IlJW16Ezy1JJHIGuyzCexReJkP+G0GRAEs3yxco=;\n h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme;\n b=aioDwdEDu57Jz6Zu7iDnS66HGhnyZE0PD2wfLAOuIC5NKVRH9FwXfv/ECPaNPQuXMwzyNpGmFO1BTRJvPW2DicT6vRy0M/n3pPjODXBiR/ZN/90QO5IYhJHmtbcLsjw5PUzV3RcZrAQAisHseCejN/HWgXrlDRjVhUv8BT8OKiO9LPT+DaM2JHnqibLcfj1MB3/gqrfGbUeo2juhz4JzzVLQZmZe5PnpLe9udPT9FYd+XNfC7baxZmODoGoev3L4AT+r8OUDRxLYwgqlJjFJ0i0ja9fC+3P43fVWEL++Y6WOH2cC2gNi6ZgkaRiWKt/hZ8L9e+PyvUv6KkdQVr6AkQ==", "mail-alias-created-date": "1752046281608", "From": "Mohamed Mediouni <mohamed@unpredictable.fr>", "To": "qemu-devel@nongnu.org", "Cc": "Pedro Barbuda <pbarbuda@microsoft.com>, Wei Liu <wei.liu@kernel.org>,\n Mohamed Mediouni <mohamed@unpredictable.fr>,\n Paolo Bonzini <pbonzini@redhat.com>, Roman Bolshakov <rbolshakov@ddn.com>,\n Phil Dennis-Jordan <phil@philjordan.eu>, Zhao Liu <zhao1.liu@intel.com>", "Subject": "[PATCH v7 10/11] whpx: i386: disable kernel-irqchip on Windows 10\n when PIC enabled", "Date": "Sun, 5 Apr 2026 04:34:08 +0200", "Message-ID": "<20260405023409.23142-11-mohamed@unpredictable.fr>", "X-Mailer": "git-send-email 2.50.1", "In-Reply-To": "<20260405023409.23142-1-mohamed@unpredictable.fr>", "References": "<20260405023409.23142-1-mohamed@unpredictable.fr>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Authority-Info-Out": "v=2.4 cv=N4gk1m9B c=1 sm=1 tr=0 ts=69d1ca35\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=nUl_a9z44qMLw6SsMv4A:9", "X-Proofpoint-GUID": "owgzWY4-ar_f8s5rKBh7oPh9Qc1Pio8t", "X-Proofpoint-ORIG-GUID": "owgzWY4-ar_f8s5rKBh7oPh9Qc1Pio8t", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDA1MDAyNCBTYWx0ZWRfX2BiGLIQor/l+\n isitonXCz9R3nghybwfvqkbVF6X7VzgyjSkaIbERO6ZIe5iQeMp3Eg3/Qys+2bjS4Ekm2E5DmLQ\n dpZVLJIbhp7PXZg09JvvIRVchVhlPbDatjApfp4xBQkfOgxwED1SoND7iSqYKp4FNO+ixsDA26O\n SUZYUb/rvKtv+kb1ECzto8dbD6fk+W560qZ3STdgdL5Jql60ysXJNlyznTJCojgzHidSDzbN/vS\n RvsSgnr+jXvBCj+yNn5Cw7ODEERrNTi+W1hQjwNLhL1bgXpIt1WBOWSsv9T3NrkcQ/AyfocvmvY\n JAo2VVdP0r2BkB0kdW/84CdH+GqEsInpxzs/T3ZhtDs7FXrNf37QLrxiMirUd4=", "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=2026-04-05_01,2026-04-03_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=notspam policy=default score=0 mlxlogscore=778\n lowpriorityscore=0 bulkscore=0 malwarescore=0\n phishscore=0 clxscore=1030\n mlxscore=0 adultscore=0 spamscore=0 suspectscore=0 classifier=spam\n authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000\n definitions=main-2604050024", "Received-SPF": "pass client-ip=57.103.78.192;\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_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_PASS=-0.001,\n 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 <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Move WHvCapabilityCodeProcessorPerfmonFeatures queries\nas that's how we distinguish if on a legacy OS.\n\nNow that Windows guests are booting, disable kernel-irqchip=on\nby default for Windows 10 when the PIC is enabled.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\n---\n target/i386/whpx/whpx-all.c | 69 +++++++++++++++++++++----------------\n 1 file changed, 39 insertions(+), 30 deletions(-)", "diff": "diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 0b0b03864b..8bc1a609d2 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2435,6 +2435,13 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n 0x8000000A, 0x80000021, 0x80000022, 0xC0000000, 0xC0000001};\n UINT32 cpuidExitList_legacy_os[] = {1, 0x40000000, 0x40000001, 0x40000010};\n \n+ X86MachineState *x86ms = X86_MACHINE(ms);\n+ bool pic_enabled = false;\n+\n+ if (x86ms->pic == ON_OFF_AUTO_ON || x86ms->pic == ON_OFF_AUTO_AUTO) {\n+ pic_enabled = true;\n+ }\n+\n whpx = &whpx_global;\n \n if (!init_whp_dispatch()) {\n@@ -2506,6 +2513,35 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n goto error;\n }\n \n+ /* Enable supported performance monitoring capabilities */\n+ hr = whp_dispatch.WHvGetCapability(\n+ WHvCapabilityCodeProcessorPerfmonFeatures, &perfmon_features,\n+ sizeof(WHV_PROCESSOR_PERFMON_FEATURES), &whpx_cap_size);\n+ /*\n+ * Relying on this is a crutch to maintain Windows 10 support.\n+ *\n+ * WHvCapabilityCodeProcessorPerfmonFeatures and\n+ * WHvPartitionPropertyCodeSyntheticProcessorFeaturesBanks\n+ * are implemented starting from Windows Server 2022 (build 20348).\n+ */\n+ if (FAILED(hr)) {\n+ warn_report(\"WHPX: Failed to get performance \"\n+ \"monitoring features, hr=%08lx\", hr);\n+ is_modern_os = false;\n+ } else {\n+ hr = whp_dispatch.WHvSetPartitionProperty(\n+ whpx->partition,\n+ WHvPartitionPropertyCodeProcessorPerfmonFeatures,\n+ &perfmon_features,\n+ sizeof(WHV_PROCESSOR_PERFMON_FEATURES));\n+ if (FAILED(hr)) {\n+ error_report(\"WHPX: Failed to set performance \"\n+ \"monitoring features, hr=%08lx\", hr);\n+ ret = -EINVAL;\n+ goto error;\n+ }\n+ }\n+\n /*\n * Error out if WHP doesn't support apic emulation and user is requiring\n * it.\n@@ -2518,8 +2554,9 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n goto error;\n }\n \n- if (whpx->kernel_irqchip_allowed && features.LocalApicEmulation &&\n- whp_dispatch.WHvSetVirtualProcessorInterruptControllerState2) {\n+ if (whpx->kernel_irqchip_allowed && !(whpx_is_legacy_os() && pic_enabled\n+ && !whpx->kernel_irqchip_required) && features.LocalApicEmulation\n+ && whp_dispatch.WHvSetVirtualProcessorInterruptControllerState2) {\n WHV_X64_LOCAL_APIC_EMULATION_MODE mode =\n WHvX64LocalApicEmulationModeX2Apic;\n hr = whp_dispatch.WHvSetPartitionProperty(\n@@ -2578,34 +2615,6 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n goto error;\n }\n \n- /* Enable supported performance monitoring capabilities */\n- hr = whp_dispatch.WHvGetCapability(\n- WHvCapabilityCodeProcessorPerfmonFeatures, &perfmon_features,\n- sizeof(WHV_PROCESSOR_PERFMON_FEATURES), &whpx_cap_size);\n- /*\n- * Relying on this is a crutch to maintain Windows 10 support.\n- *\n- * WHvCapabilityCodeProcessorPerfmonFeatures and\n- * WHvPartitionPropertyCodeSyntheticProcessorFeaturesBanks\n- * are implemented starting from Windows Server 2022 (build 20348).\n- */\n- if (FAILED(hr)) {\n- warn_report(\"WHPX: Failed to get performance \"\n- \"monitoring features, hr=%08lx\", hr);\n- is_modern_os = false;\n- } else {\n- hr = whp_dispatch.WHvSetPartitionProperty(\n- whpx->partition,\n- WHvPartitionPropertyCodeProcessorPerfmonFeatures,\n- &perfmon_features,\n- sizeof(WHV_PROCESSOR_PERFMON_FEATURES));\n- if (FAILED(hr)) {\n- error_report(\"WHPX: Failed to set performance \"\n- \"monitoring features, hr=%08lx\", hr);\n- ret = -EINVAL;\n- goto error;\n- }\n- }\n \n /* Enable synthetic processor features */\n WHV_SYNTHETIC_PROCESSOR_FEATURES_BANKS synthetic_features;\n", "prefixes": [ "v7", "10/11" ] }