From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0E822CCD19E for ; Thu, 16 Oct 2025 18:45:40 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1v9Sxu-0001hq-FF; Thu, 16 Oct 2025 14:44:44 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v9Sxr-0001gi-6o for qemu-devel@nongnu.org; Thu, 16 Oct 2025 14:44:39 -0400 Received: from p-east3-cluster6-host12-snip4-8.eps.apple.com ([57.103.85.249] helo=outbound.qs.icloud.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1v9Sxa-00025P-S3 for qemu-devel@nongnu.org; Thu, 16 Oct 2025 14:44:38 -0400 Received: from outbound.qs.icloud.com (unknown [127.0.0.2]) by p00-icloudmta-asmtp-us-east-2d-100-percent-9 (Postfix) with ESMTPS id 43D2518004E4; Thu, 16 Oct 2025 18:44:17 +0000 (UTC) Dkim-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=unpredictable.fr; s=sig1; bh=jXPIkvwftnVZHRg4Mjz/B4doNai4bCzAxKe4sYL/QI8=; h=From:To:Subject:Date:Message-ID:MIME-Version:x-icloud-hme; b=AjIcr1rcdLHwDBsG9Y09IiNwKBwXwuFU5S/dzH46M5KSSPbpjK/2vZVJAy5TFKBdTvC464x5kzxfYehth060Vzz91WWqegB/Fog7hLnEIYcr1xFj/CecTIc/MoMEjANS3Hv4nHOBVntBWv5SpDLYp1zdM6JLbeBPCfCISJu+Y1UbU2HALHXKUa6/8aGDneCByUP8snYXRirpEzopLHCQy2gKvdDs4fLCKOCbGJSSRYeeeu5pa32WdU8hYc+11qGI310WtgJ33xRcZaWB53aDjCFz/aEhAIDeCUotO3eKm5590dhsRFMCu2U3243/J4WWd9WyGAOSNwUVQoNhV9vbQw== mail-alias-created-date: 1752046281608 Received: from localhost.localdomain (unknown [17.57.155.37]) by p00-icloudmta-asmtp-us-east-2d-100-percent-9 (Postfix) with ESMTPSA id 7E6E1180016A; Thu, 16 Oct 2025 18:44:15 +0000 (UTC) From: Mohamed Mediouni To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Paolo Bonzini , Peter Maydell , Phil Dennis-Jordan , Cameron Esfahani , Alexander Graf , Mohamed Mediouni , Mads Ynddal , Pedro Barbuda Subject: [PATCH v8 15/24] hw/arm: virt: cleanly fail on attempt to use the platform vGIC together with ITS Date: Thu, 16 Oct 2025 20:44:04 +0200 Message-ID: <20251016184413.69870-1-mohamed@unpredictable.fr> X-Mailer: git-send-email 2.50.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMDE2MDEzNyBTYWx0ZWRfX7WfhM/iit82v OIdbfV3Ku4ZRZ13APXm7TPtLQc3LpR5ZYiSU6FxKnF3qjM9BXf2RrcgtqL7AqdWYfZOC0DEhF7v YYYzZWjnmxn1DONW3+cY5mDXMRr7YcFTV5HKvpfLvL9hHXHlyeLt5GaGSGTP8LIgbx58MgDjnp2 OZPSw3QPyaGijxte/3La96ZHppxrWYSVwtZWH8GbuidPNiJtUzS5uQj2Tepoghe1CqxX9JydDir fOZj0fy9SbLKT/UwntnX1JhcQT4nJA2QM21iWhnC1vS3Bo0vAuHnDptSvJZ9Fy5DhxlbB6PRo= X-Proofpoint-ORIG-GUID: kkO2l9kMjSZ6w_dX1_ZU-DJeyo8IG1yI X-Proofpoint-GUID: kkO2l9kMjSZ6w_dX1_ZU-DJeyo8IG1yI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-10-16_03,2025-10-13_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxscore=0 adultscore=0 phishscore=0 spamscore=0 malwarescore=0 bulkscore=0 mlxlogscore=953 clxscore=1030 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.22.0-2506270000 definitions=main-2510160137 X-JNJ: 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 Received-SPF: pass client-ip=57.103.85.249; envelope-from=mohamed@unpredictable.fr; helo=outbound.qs.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, T_SPF_HELO_TEMPERROR=0.01, T_SPF_TEMPERROR=0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@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-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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=off explicitly for the newest machine version: GICv3 + GICv2m Signed-off-by: Mohamed Mediouni --- hw/arm/virt-acpi-build.c | 15 +++++++------ hw/arm/virt.c | 46 +++++++++++++++++++++++++++++++--------- include/hw/arm/virt.h | 4 +++- 3 files changed, 47 insertions(+), 18 deletions(-) diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c index 0a6ec74aa0..8e730731ca 100644 --- a/hw/arm/virt-acpi-build.c +++ b/hw/arm/virt-acpi-build.c @@ -472,7 +472,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) nb_nodes = num_smmus + 1; /* RC and SMMUv3 */ rc_mapping_count = rc_smmu_idmaps_len; - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* * Knowing the ID ranges from the RC to the SMMU, it's possible to * determine the ID ranges from RC that go directly to ITS. @@ -483,7 +483,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) rc_mapping_count += rc_its_idmaps->len; } } else { - if (vms->its) { + if (virt_is_its_enabled(vms)) { nb_nodes = 2; /* RC and ITS */ rc_mapping_count = 1; /* Direct map to ITS */ } else { @@ -498,7 +498,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) build_append_int_noprefix(table_data, IORT_NODE_OFFSET, 4); build_append_int_noprefix(table_data, 0, 4); /* Reserved */ - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* Table 12 ITS Group Format */ build_append_int_noprefix(table_data, 0 /* ITS Group */, 1); /* Type */ node_size = 20 /* fixed header size */ + 4 /* 1 GIC ITS Identifier */; @@ -517,7 +517,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) int smmu_mapping_count, offset_to_id_array; int irq = sdev->irq; - if (vms->its) { + if (virt_is_its_enabled(vms)) { smmu_mapping_count = 1; /* ITS Group node */ offset_to_id_array = SMMU_V3_ENTRY_SIZE; /* Just after the header */ } else { @@ -610,7 +610,7 @@ build_iort(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) } } - 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. @@ -945,7 +945,7 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) memmap[VIRT_HIGH_GIC_REDIST2].size); } - if (vms->its) { + if (virt_is_its_enabled(vms)) { /* * ACPI spec, Revision 6.0 Errata A * (original 6.0 definition has invalid Length) @@ -961,7 +961,8 @@ build_madt(GArray *table_data, BIOSLinker *linker, VirtMachineState *vms) } } - if (!(vms->gic_version != VIRT_GIC_VERSION_2 && vms->its) && !vms->no_gicv3_with_gicv2m) { + if (!(vms->gic_version != VIRT_GIC_VERSION_2 && virt_is_its_enabled(vms)) + && !vms->no_gicv3_with_gicv2m) { const uint16_t spi_base = vms->irqmap[VIRT_GIC_V2M] + ARM_SPI_BASE; /* 5.2.12.16 GIC MSI Frame Structure */ diff --git a/hw/arm/virt.c b/hw/arm/virt.c index 9121eb37eb..dbf9a28b8d 100644 --- a/hw/arm/virt.c +++ b/hw/arm/virt.c @@ -735,7 +735,7 @@ static void create_its(VirtMachineState *vms) { DeviceState *dev; - 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 @@ -744,6 +744,15 @@ static void create_its(VirtMachineState *vms) return; } + if (whpx_enabled() && vms->tcg_its) { + /* + * Signal to the user when ITS is neither supported by the host + * nor emulated by the machine. + */ + info_report("ITS not supported on WHPX."); + exit(1); + } + dev = qdev_new(its_class_name()); object_property_set_link(OBJECT(dev), "parent-gicv3", OBJECT(vms->gic), @@ -955,7 +964,7 @@ static void create_gic(VirtMachineState *vms, MemoryRegion *mem) fdt_add_gic_node(vms); - if (vms->gic_version != VIRT_GIC_VERSION_2 && vms->its) { + if (vms->gic_version != VIRT_GIC_VERSION_2 && virt_is_its_enabled(vms)) { create_its(vms); } else if (vms->gic_version != VIRT_GIC_VERSION_2 && !vms->no_gicv3_with_gicv2m) { create_v2m(vms); @@ -2705,18 +2714,34 @@ static void virt_set_highmem_mmio_size(Object *obj, Visitor *v, extended_memmap[VIRT_HIGH_PCIE_MMIO].size = size; } -static bool virt_get_its(Object *obj, Error **errp) +bool virt_is_its_enabled(VirtMachineState *vms) +{ + if (vms->its == ON_OFF_AUTO_OFF) { + return false; + } + if (vms->its == 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 = VIRT_MACHINE(obj); + OnOffAuto its = vms->its; - return vms->its; + visit_type_OnOffAuto(v, name, &its, errp); } -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 = VIRT_MACHINE(obj); - vms->its = value; + visit_type_OnOffAuto(v, name, &vms->its, errp); } static bool virt_get_dtb_randomness(Object *obj, Error **errp) @@ -3426,8 +3451,9 @@ static void virt_machine_class_init(ObjectClass *oc, const void *data) "guest CPU which implements the ARM " "Memory Tagging Extension"); - 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"); @@ -3487,8 +3513,8 @@ static void virt_instance_init(Object *obj) vms->highmem_mmio = true; vms->highmem_redists = true; - /* Default allows ITS instantiation */ - vms->its = true; + /* Default allows ITS instantiation if available */ + vms->its = ON_OFF_AUTO_AUTO; /* Allow ITS emulation if the machine version supports it */ vms->tcg_its = !vmc->no_tcg_its; vms->no_gicv3_with_gicv2m = false; diff --git a/include/hw/arm/virt.h b/include/hw/arm/virt.h index d31348dd61..997dd51678 100644 --- a/include/hw/arm/virt.h +++ b/include/hw/arm/virt.h @@ -149,7 +149,7 @@ struct VirtMachineState { bool highmem_ecam; bool highmem_mmio; bool highmem_redists; - bool its; + OnOffAuto its; bool tcg_its; bool virt; bool ras; @@ -218,4 +218,6 @@ static inline int virt_gicv3_redist_region_count(VirtMachineState *vms) vms->highmem_redists) ? 2 : 1; } +bool virt_is_its_enabled(VirtMachineState *vms); + #endif /* QEMU_ARM_VIRT_H */ -- 2.50.1 (Apple Git-155)