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Tsirkin" , Zhao Liu , Yanan Wang , Pedro Barbuda , Marcel Apfelbaum , Phil Dennis-Jordan , Shannon Zhao , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , Paolo Bonzini , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Akihiko Odaki , Ani Sinha , Richard Henderson , Peter Maydell , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Peter Xu , Mads Ynddal , Igor Mammedov , Alexander Graf , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Cameron Esfahani Subject: [PATCH v14 06/26] hw/arm: virt: cleanly fail on attempt to use the platform vGIC together with ITS Date: Wed, 14 Jan 2026 14:41:23 +0100 Message-ID: <20260114134143.26198-7-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20260114134143.26198-1-mohamed@unpredictable.fr> References: <20260114134143.26198-1-mohamed@unpredictable.fr> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-GUID: -DDL5d9uNq3w8Kgy60D9Sjer7f-UJ0f- X-Authority-Info: v=2.4 cv=GdIaXAXL c=1 sm=1 tr=0 ts=69679d37 cx=c_apl:c_apl_out:c_pps a=YrL12D//S6tul8v/L+6tKg==:117 a=YrL12D//S6tul8v/L+6tKg==:17 a=065Y4zqepXN3nrMe:21 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=eCCvHKTOcc9AFgEG6kwA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE0MDExNCBTYWx0ZWRfX20sRgrt9Pfdk u4MEzThTMCkJvmOMU5yjzDvGU5a8Zco33A0kdnqXuqN+ntEzzvz6d8PjaVaAL3mXRAKKSru+V3Z Xi7kci2MOzHjFNvU5iGIADttt7xjBGi0QUzuqZJ3gIQ0p6tIwipJraO3v8vr4UohCLDeR8+bdqd DymNLAKaBWIVUzglAfSvpNmHoEAisyYitaC1oSGPBbjqVQmb1xU9UcfQ2Dra8zEg0p4Vbq6fZbJ c3mUqVRXZ28QOIe1RS52PBwSboJIRIqs6FJcTXaKQb2+8OIhU+WI5TeXBgmLpkcEzQYtVSN5pkP O2A8QFVNsOh4ikwDFs6 X-Proofpoint-ORIG-GUID: -DDL5d9uNq3w8Kgy60D9Sjer7f-UJ0f- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-14_04,2026-01-14_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 suspectscore=0 clxscore=1030 mlxlogscore=999 bulkscore=0 malwarescore=0 mlxscore=0 adultscore=0 phishscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2601140114 X-JNJ: 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 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=57.103.77.152; 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, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @unpredictable.fr) X-ZM-MESSAGEID: 1768398296362158500 Content-Type: text/plain; charset="utf-8" Switch its to a tristate. Windows Hypervisor Platform's vGIC doesn't support ITS. Deal with this by reporting to the user and exiting. Regular configuration: GICv3 + ITS New default configuration with WHPX: GICv3 with GICv2m And its=3Doff explicitly for the newest machine version: GICv3 + GICv2m Signed-off-by: Mohamed Mediouni --- hw/arm/virt-acpi-build.c | 14 ++++++------ hw/arm/virt.c | 46 +++++++++++++++++++++++++++++++--------- include/hw/arm/virt.h | 4 +++- 3 files changed, 46 insertions(+), 18 deletions(-) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index 40ea6b6dd5..86024a1a73 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -473,7 +473,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) nb_nodes =3D num_smmus + 1; /* RC and SMMUv3 */ rc_mapping_count =3D rc_smmu_idmaps_len; =20 - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* * Knowing the ID ranges from the RC to the SMMU, it's possibl= e to * determine the ID ranges from RC that go directly to ITS. @@ -484,7 +484,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) rc_mapping_count +=3D rc_its_idmaps->len; } } else { - if (vms->its) { + if (virt_is_its_enabled(vms)) { nb_nodes =3D 2; /* RC and ITS */ rc_mapping_count =3D 1; /* Direct map to ITS */ } else { @@ -499,7 +499,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) build_append_int_noprefix(table_data, IORT_NODE_OFFSET, 4); build_append_int_noprefix(table_data, 0, 4); /* Reserved */ =20 - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* Table 12 ITS Group Format */ build_append_int_noprefix(table_data, 0 /* ITS Group */, 1); /* Ty= pe */ node_size =3D 20 /* fixed header size */ + 4 /* 1 GIC ITS Identif= ier */; @@ -518,7 +518,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) int smmu_mapping_count, offset_to_id_array; int irq =3D sdev->irq; =20 - if (vms->its) { + if (virt_is_its_enabled(vms)) { smmu_mapping_count =3D 1; /* ITS Group node */ offset_to_id_array =3D SMMU_V3_ENTRY_SIZE; /* Just after the h= eader */ } else { @@ -611,7 +611,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) } } =20 - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* * Map bypassed (don't go through the SMMU) RIDs (input) to * ITS Group node directly: RC -> ITS. @@ -946,7 +946,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) memmap[VIRT_HIGH_GIC_REDIST2].si= ze); } =20 - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* * ACPI spec, Revision 6.0 Errata A * (original 6.0 definition has invalid Length) @@ -962,7 +962,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, Virt= MachineState *vms) } } =20 - if (!(vms->gic_version !=3D VIRT_GIC_VERSION_2 && vms->its) + if (!(vms->gic_version !=3D VIRT_GIC_VERSION_2 && virt_is_its_enabled(= vms)) && !vms->no_gicv3_with_gicv2m) { const uint16_t spi_base =3D vms->irqmap[VIRT_GIC_V2M] + ARM_SPI_BA= SE; =20 diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 4fad34e108..553c7f62cc 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -737,7 +737,7 @@ static void create_its(VirtMachineState *vms) { DeviceState *dev; =20 - assert(vms->its); + assert(virt_is_its_enabled(vms)); if (!kvm_irqchip_in_kernel() && !vms->tcg_its) { /* * Do nothing if ITS is neither supported by the host nor emulated= by @@ -746,6 +746,15 @@ static void create_its(VirtMachineState *vms) return; } =20 + if (whpx_enabled()) { + /* + * Signal to the user when ITS is neither supported by the host + * nor emulated by the machine. + */ + error_report("ITS not supported on WHPX."); + exit(1); + } + dev =3D qdev_new(its_class_name()); =20 object_property_set_link(OBJECT(dev), "parent-gicv3", OBJECT(vms->gic), @@ -957,7 +966,7 @@ static void create_gic(VirtMachineState *vms, MemoryReg= ion *mem) =20 fdt_add_gic_node(vms); =20 - if (vms->gic_version !=3D VIRT_GIC_VERSION_2 && vms->its) { + if (vms->gic_version !=3D VIRT_GIC_VERSION_2 && virt_is_its_enabled(vm= s)) { create_its(vms); } else if (vms->gic_version !=3D VIRT_GIC_VERSION_2 && !vms->no_gicv3_= with_gicv2m) { create_v2m(vms); @@ -2699,18 +2708,34 @@ static void virt_set_highmem_mmio_size(Object *obj,= Visitor *v, extended_memmap[VIRT_HIGH_PCIE_MMIO].size =3D size; } =20 -static bool virt_get_its(Object *obj, Error **errp) +bool virt_is_its_enabled(VirtMachineState *vms) +{ + if (vms->its =3D=3D ON_OFF_AUTO_OFF) { + return false; + } + if (vms->its =3D=3D ON_OFF_AUTO_AUTO) { + if (whpx_enabled()) { + return false; + } + } + return true; +} + +static void virt_get_its(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) { VirtMachineState *vms =3D VIRT_MACHINE(obj); + OnOffAuto its =3D vms->its; =20 - return vms->its; + visit_type_OnOffAuto(v, name, &its, errp); } =20 -static void virt_set_its(Object *obj, bool value, Error **errp) +static void virt_set_its(Object *obj, Visitor *v, const char *name, + void *opaque, Error **errp) { VirtMachineState *vms =3D VIRT_MACHINE(obj); =20 - vms->its =3D value; + visit_type_OnOffAuto(v, name, &vms->its, errp); } =20 static bool virt_get_dtb_randomness(Object *obj, Error **errp) @@ -3427,8 +3452,9 @@ static void virt_machine_class_init(ObjectClass *oc, = const void *data) "guest CPU which implements the = ARM " "Memory Tagging Extension"); =20 - object_class_property_add_bool(oc, "its", virt_get_its, - virt_set_its); + object_class_property_add(oc, "its", "OnOffAuto", + virt_get_its, virt_set_its, + NULL, NULL); object_class_property_set_description(oc, "its", "Set on/off to enable/disable " "ITS instantiation"); @@ -3488,8 +3514,8 @@ static void virt_instance_init(Object *obj) vms->highmem_mmio =3D true; vms->highmem_redists =3D true; =20 - /* Default allows ITS instantiation */ - vms->its =3D true; + /* Default allows ITS instantiation if available */ + vms->its =3D ON_OFF_AUTO_AUTO; /* Allow ITS emulation if the machine version supports it */ vms->tcg_its =3D !vmc->no_tcg_its; vms->no_gicv3_with_gicv2m =3D false; diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index c5bc47ee88..394b70c62e 100644 --- a/include/hw/arm/virt.h +++ b/include/hw/arm/virt.h @@ -147,7 +147,7 @@ struct VirtMachineState { bool highmem_ecam; bool highmem_mmio; bool highmem_redists; - bool its; + OnOffAuto its; bool tcg_its; bool virt; bool ras; @@ -216,4 +216,6 @@ static inline int virt_gicv3_redist_region_count(VirtMa= chineState *vms) vms->highmem_redists) ? 2 : 1; } =20 +bool virt_is_its_enabled(VirtMachineState *vms); + #endif /* QEMU_ARM_VIRT_H */ --=20 2.50.1 (Apple Git-155)