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Peter Anvin" , Subject: [PATCH 2/2] xen/x86: detect support for extended destination ID Date: Thu, 20 Jan 2022 16:25:27 +0100 Message-ID: <20220120152527.7524-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220120152527.7524-1-roger.pau@citrix.com> References: <20220120152527.7524-1-roger.pau@citrix.com> X-ClientProxiedBy: MR1P264CA0091.FRAP264.PROD.OUTLOOK.COM (2603:10a6:501:3f::28) To DS7PR03MB5608.namprd03.prod.outlook.com (2603:10b6:5:2c9::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: f6df1d34-5b7c-4ae6-3a02-08d9dc292366 X-MS-TrafficTypeDiagnostic: SA0PR03MB5468:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7691; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR03MB5608.namprd03.prod.outlook.com;PTR:;CAT:NONE;SFS:(4636009)(366004)(8676002)(6512007)(6486002)(6666004)(82960400001)(66476007)(66556008)(6916009)(7416002)(54906003)(316002)(8936002)(36756003)(66946007)(508600001)(83380400001)(5660300002)(186003)(38100700002)(26005)(6506007)(2616005)(2906002)(1076003)(4326008)(86362001);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?q?jGFWuao+0TuJyQpntuCYbry8eVp9?= =?utf-8?q?QPdjtj2WJPmbqPOAA42SNhGGU7ydeU7kFNgDgOa30DwnytONHtQHv/2V9LBpYRboO?= =?utf-8?q?5PqPO+khojRrKvvL/6+4EUCiW/hXX4RcgsOg/CsneIKhjIQTLXXL5LxZroNvVeOaO?= =?utf-8?q?9QB6YNQZgsM1Tvd+JK+M2tTHD2nd9q7gAzQFqR4HwSH26RvpuZ9z4Id4fe/HJqkYP?= =?utf-8?q?jMuPDoeZAlcxqYrx9v3n+jXA8+mJVZ/9sFXXLl6U9brfRO+AQyzMIidrrpFjb3Qse?= =?utf-8?q?g8KXmca4aMmioNU4i440t4pb7W9j3gy5PI8TSqPOJQvSEeY8LPL3IWuQletyXX62Y?= =?utf-8?q?O9/tAQCQOBE+psQtTodiIa/hnDDau4veE3K0jRPnzShtGcA+AMcGkPT5S6dvOmoYN?= =?utf-8?q?ZR90oLSyT2iRDS/BSjEx4q+ftKpUO83i+cK80VxKndIg+vIM6Npnumv1hS2eQk2Xy?= =?utf-8?q?jzmDOrElYY2v2vPP6er5TwlR2aWMXagNx2Q8Gm7+YLLGYelg+Z0jvHwhRyQhtaiHr?= =?utf-8?q?ra8/r5EDxRc6YYCR13vMF/ZEfgreNgD3cj4W4MXnsxnlzjfXcjx+INMQm0Dw9I5rz?= =?utf-8?q?EF0H6wmxnlZUl9lJnKDKo4v1d6aX2Y82N1If/dxMFQfdccXQAYfC1t23CQ42OXzjM?= =?utf-8?q?VOKWZy4Tz2UtEVaLrwwwwuEezyoWdfxMIIfhSvWVvsx78/B/zCwYbn0HQzMNMTIpK?= =?utf-8?q?2isMfQ8ssiat2L75fH2wFHdnI1qyL/19E2ZqxKpIresi1Ra6c+vsS7z2pIgiaSuTJ?= =?utf-8?q?qRx1AF/7U7r1YxKZN/uDjTuejM5ZFq8AMb5welnWZvPtubV7m0SXWw7eqXyHjSs9T?= =?utf-8?q?9t1HbreklG1KvTIrkYCv58YjkKEEBzuFZxN1GLYjbz16cbe4fh3quajpLgcrd4xQb?= =?utf-8?q?61Kkd0u2wm75M/RMsTf65ibPEcUL6S2VnlT9pj7i23FTHnqqnu7E3C+HF9/loGOJT?= =?utf-8?q?polOwqDV0GhnVGvKi6XrPxVwFC1Iuy1Y/I/gmDOvZjo7/RN6gKpxYoqgXroHe2/Vx?= =?utf-8?q?idRF26RybO/Ya4y4pfiAObI1fzMB4+/TeLLMBXQ+zwTrTjdbHUKETcQ+LSmlmXMML?= =?utf-8?q?ecPkgiHuLkUQ+LP/wI6v6YZgLFmI8er9DAS87o86u0x0BihgBDAivdhCL+G0Z96HW?= =?utf-8?q?YkPw28l96nmMZCJl74oGoUAdPCg3ishu4fLD6AfCphB7Op/oyygXu5fT6pPFb3XqT?= =?utf-8?q?TVNXuVmKtGoPaAhTF4sYuyLz8xai0ym5+q2C0H1aElgKMGwlMPfbO0CNG/pnjZDi/?= =?utf-8?q?RUuMyqxyVFttW71qnvRUm0z0ow+ZW/kqS/OtaEpA4GPxJoH+1BaajyFRV4nDFi7T4?= =?utf-8?q?at1en+Ru8qXyfMa90jeLNL6g8CVJuz7B5Ntkrc5maN7UrxPhxlrJGC5ZDG93D6XUP?= =?utf-8?q?/rjbSIXfxranCVB5Tw8o1ZOE2kQH30ngotG1hyOyvjpyAcSXdssmuAoDdy6s15K9p?= =?utf-8?q?M1Gvi87d0I9tBFe+1SGQpWkJwZESJfZ6b5oCN0dyOP5SFJK0FyKq7x1s3jVjR7MYB?= =?utf-8?q?zeb/8+LE5N1oSstFtQeKj2JgFMPRyMQ+xWysdEGdMisF9Al5xg6P7cM=3D?= X-MS-Exchange-CrossTenant-Network-Message-Id: f6df1d34-5b7c-4ae6-3a02-08d9dc292366 X-MS-Exchange-CrossTenant-AuthSource: DS7PR03MB5608.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Jan 2022 15:25:49.7494 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 335836de-42ef-43a2-b145-348c2ee9ca5b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: iPPXgv1rAw2QFPz8qeNYDdgq2YDYqwkt9HB9PEs/kBJi6B5nvbhzAgsrahrychUkxbzUuI5Ic5w04iT9p+Kb2w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR03MB5468 X-OriginatorOrg: citrix.com Xen allows the usage of some previously reserved bits in the IO-APIC RTE and the MSI address fields in order to store high bits for the target APIC ID. Such feature is already implemented by QEMU/KVM and HyperV, so in order to enable it just add the handler that checks for it's presence. Signed-off-by: Roger Pau Monné Reviewed-by: Juergen Gross --- Must not be applied until the public headers are changed in Xen. --- Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Stefano Stabellini Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: x86@kernel.org Cc: "H. Peter Anvin" Cc: xen-devel@lists.xenproject.org --- arch/x86/include/asm/xen/cpuid.h | 7 +++++++ arch/x86/xen/enlighten_hvm.c | 6 ++++++ 2 files changed, 13 insertions(+) diff --git a/arch/x86/include/asm/xen/cpuid.h b/arch/x86/include/asm/xen/cpuid.h index a9630104f1c4..78e667a31d6c 100644 --- a/arch/x86/include/asm/xen/cpuid.h +++ b/arch/x86/include/asm/xen/cpuid.h @@ -100,6 +100,13 @@ /* Memory mapped from other domains has valid IOMMU entries */ #define XEN_HVM_CPUID_IOMMU_MAPPINGS (1u << 2) #define XEN_HVM_CPUID_VCPU_ID_PRESENT (1u << 3) /* vcpu id is present in EBX */ +#define XEN_HVM_CPUID_DOMID_PRESENT (1u << 4) /* domid is present in ECX */ +/* + * Bits 55:49 from the IO-APIC RTE and bits 11:5 from the MSI address can be + * used to store high bits for the Destination ID. This expands the Destination + * ID field from 8 to 15 bits, allowing to target APIC IDs up 32768. + */ +#define XEN_HVM_CPUID_EXT_DEST_ID (1u << 5) /* * Leaf 6 (0x40000x05) diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index ab8171cbee23..0c5b0ee3a02a 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -254,6 +254,11 @@ bool __init xen_hvm_need_lapic(void) return true; } +static bool __init msi_ext_dest_id(void) +{ + return cpuid_eax(xen_cpuid_base() + 4) & XEN_HVM_CPUID_EXT_DEST_ID; +} + static __init void xen_hvm_guest_late_init(void) { #ifdef CONFIG_XEN_PVH @@ -316,6 +321,7 @@ struct hypervisor_x86 x86_hyper_xen_hvm __initdata = { .init.x2apic_available = xen_x2apic_para_available, .init.init_mem_mapping = xen_hvm_init_mem_mapping, .init.guest_late_init = xen_hvm_guest_late_init, + .init.msi_ext_dest_id = msi_ext_dest_id, .runtime.pin_vcpu = xen_pin_vcpu, .ignore_nopv = true, };