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Received: from CO6PR04MB7812.namprd04.prod.outlook.com (2603:10b6:303:138::6) by CO6PR04MB7796.namprd04.prod.outlook.com (2603:10b6:303:13b::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.20; Mon, 29 Nov 2021 08:10:11 +0000 Received: from CO6PR04MB7812.namprd04.prod.outlook.com ([fe80::8100:4308:5b21:8d97]) by CO6PR04MB7812.namprd04.prod.outlook.com ([fe80::8100:4308:5b21:8d97%9]) with mapi id 15.20.4734.024; Mon, 29 Nov 2021 08:10:11 +0000 From: Anup Patel To: Paolo Bonzini , Shuah Khan , Atish Patra Cc: Palmer Dabbelt , Paul Walmsley , Albert Ou , Alistair Francis , Anup Patel , kvm@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Anup Patel Subject: [PATCH v2 2/4] RISC-V: KVM: Add VM capability to allow userspace get GPA bits Date: Mon, 29 Nov 2021 13:24:49 +0530 Message-Id: <20211129075451.418122-3-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211129075451.418122-1-anup.patel@wdc.com> References: <20211129075451.418122-1-anup.patel@wdc.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MA1PR0101CA0024.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:21::34) To CO6PR04MB7812.namprd04.prod.outlook.com (2603:10b6:303:138::6) MIME-Version: 1.0 Received: from wdc.com (122.167.150.114) by MA1PR0101CA0024.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:21::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.23 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?2wMb294k72vQ+84Ktv81Y3Pv1uP+DrXDfnm7tfbPLfu626PRMqLSLPulR7eG?= =?us-ascii?Q?hGIz7uAx5iVWKDp5tvKkddGCuG6JFABYh0tKJM3XEUGOremkNr/olmTYlvbH?= =?us-ascii?Q?EVb8mybZbSGfJpGwn311A24X0wJL2WpVwtaM613SksUK0iuDnwjXxOK5T0ji?= =?us-ascii?Q?qXAPWEW8OJxXQZbwX/xElfXjjqXLcu4OPju0cAv36uRzIWHhHRMhzioiRmhg?= =?us-ascii?Q?Nq8Askclh+pFlWpf/+4UXFBUUuCw7kz5LJbcVdDElLL8HTArYRfOr2HIpXGh?= =?us-ascii?Q?uVoQDIN8roeBFhbEEoclHsaLlKfD/XTx/b7EIKn8k4BUeKRZ+YVy3d8BOEqc?= =?us-ascii?Q?/Rm10VAnSyuti/WGUuYwXnwdwhMa9PysSPuh0ZNHjSd49EwBCXvb5HPlNvvU?= =?us-ascii?Q?T4lEXg2swfluINvOj9Dyag+MTFh2VqgFrNNJADLZONEgXIUSInCwMN++oOIh?= =?us-ascii?Q?nWoJW0a4TjXOgNkIrnRgb2PEMfFuTw+0bAozv6R4bBvqiCCD4Lr0DFdnKbxK?= =?us-ascii?Q?2jaJC/Vlfe+gKg/8+yQvzFTYT0PILdbhUmLnQRKy5elosyNn2d0bXpDY5Z4T?= =?us-ascii?Q?G44OwPsBlfseueEBT8pGuo92J8BtbkOWEpur4a7Hn1cxAfjEhJyKSVZoatbj?= =?us-ascii?Q?9ma1tQw+FodgY5DzrQLgzthK2QAotXy5z3/ehXnQr49Hf5NwICLkHkHq0oP6?= =?us-ascii?Q?S92e4srwoFZzCioWzwTDJ1FyQXDwwfPg1Svw5m5lkZfAfyH9Wn1NletcajoX?= =?us-ascii?Q?iqapeA24m4RubpRrK6C4Rl9hOJvkxvw8F4ceE4yfUEanVvBMmcK3Whp6qwIN?= =?us-ascii?Q?Wu+Lk6B58CTZ94i8HVfMfv11aN6mYupLGHDd2DMrcg9QZB8iLK3cq4NeZIHw?= =?us-ascii?Q?b9wiAJf2JpJ3zV7XuWDVaRC8Y2X83J+M8zsx7Eg8wELZB7vRnLOsOaTQSQGM?= =?us-ascii?Q?RZzwciFMprzCUZDEZsr19Y55MpBvMHPqoE1U8Q+YGrOG6NU7CzbELWEgJ9fC?= =?us-ascii?Q?9Dr7srwu4fXij36RyIrAYgOXQfwBXPIawJnmvsX+KLLk7yI+HsZRLVHY3j4w?= =?us-ascii?Q?b/jPNRZk5gPnHAJU2uOlL7Vsc3mCs29BzdJj7RGDIZwYrMPLOw0EkCgkyQY/?= =?us-ascii?Q?JukD+A2jdKagAx4hSgQS5H93/XbKesweTheToeojGkZL4R9rGhvuoEzK+VQF?= =?us-ascii?Q?2c1tanYaHcPs5ZXkZpN0EXdwOWuWIhoHzZJB0zHWCOWhOsherpWrMwS3yQMj?= =?us-ascii?Q?a9Trr+i2MEcc+52oSvgWxbBl3OTB2rjCXhuFq4vPqwZCRBzoqwoL4pJoYkbs?= =?us-ascii?Q?HJlUwY1gJbVYDUf9SEBDnHInyAr8UtEcDu9l2fhVxlETCJCl7VAy8ySbWReL?= =?us-ascii?Q?O/7fOtizcnugrOn+OpPHojeaTu8O3RKA9N/ihtqDEtujNfVdlfO3j4JEO7cw?= =?us-ascii?Q?IwwUousvDVQz8mBfHpiG/+4mHRoatwBrjFIWWu+X6c/u/9rbCI1xC4W7RXg7?= =?us-ascii?Q?vcf+mGM4XWCRg/RVeUEOvEIXc4xlABLfVVqOWw5r78Xf7v+606x/MZ+FQQYh?= =?us-ascii?Q?d1qrZzHJ+bpnzBGnWkuDjb3K1ZFQajZ+gn5pKFgFQNX40ynYPmIAbgKkakeu?= =?us-ascii?Q?0PDGRXA99kdtOJdLbih6d8M=3D?= X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 16035733-035a-49c5-f27a-08d9b30faa42 X-MS-Exchange-CrossTenant-AuthSource: CO6PR04MB7812.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Nov 2021 08:10:11.3295 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: LHFiFx5XFd6aTTflaQWdCqhrAp6VlNlWfYC9CF9LlWB15DBhuInxp5eIDlyQMGoAAnX+Hc0QhBhkZRuTTdkDmA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR04MB7796 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The number of GPA bits supported for a RISC-V Guest/VM is based on the MMU mode used by the G-stage translation. The KVM RISC-V will detect and use the best possible MMU mode for the G-stage in kvm_arch_init(). We add a generic VM capability KVM_CAP_VM_GPA_BITS which can be used by the KVM userspace to get the number of GPA (guest physical address) bits supported for a Guest/VM. Signed-off-by: Anup Patel --- arch/riscv/include/asm/kvm_host.h | 1 + arch/riscv/kvm/mmu.c | 5 +++++ arch/riscv/kvm/vm.c | 3 +++ include/uapi/linux/kvm.h | 1 + 4 files changed, 10 insertions(+) diff --git a/arch/riscv/include/asm/kvm_host.h b/arch/riscv/include/asm/kvm_host.h index 37589b953bcb..ae5d238607fe 100644 --- a/arch/riscv/include/asm/kvm_host.h +++ b/arch/riscv/include/asm/kvm_host.h @@ -221,6 +221,7 @@ void kvm_riscv_stage2_free_pgd(struct kvm *kvm); void kvm_riscv_stage2_update_hgatp(struct kvm_vcpu *vcpu); void kvm_riscv_stage2_mode_detect(void); unsigned long kvm_riscv_stage2_mode(void); +int kvm_riscv_stage2_gpa_size(void); void kvm_riscv_stage2_vmid_detect(void); unsigned long kvm_riscv_stage2_vmid_bits(void); diff --git a/arch/riscv/kvm/mmu.c b/arch/riscv/kvm/mmu.c index 9ffd0255af43..9b6d6465094f 100644 --- a/arch/riscv/kvm/mmu.c +++ b/arch/riscv/kvm/mmu.c @@ -760,3 +760,8 @@ unsigned long kvm_riscv_stage2_mode(void) { return stage2_mode >> HGATP_MODE_SHIFT; } + +int kvm_riscv_stage2_gpa_size(void) +{ + return stage2_gpa_bits; +} diff --git a/arch/riscv/kvm/vm.c b/arch/riscv/kvm/vm.c index fb18af34a4b5..6f959639ec45 100644 --- a/arch/riscv/kvm/vm.c +++ b/arch/riscv/kvm/vm.c @@ -82,6 +82,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_NR_MEMSLOTS: r = KVM_USER_MEM_SLOTS; break; + case KVM_CAP_VM_GPA_BITS: + r = kvm_riscv_stage2_gpa_size(); + break; default: r = 0; break; diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 1daa45268de2..469f05d69c8d 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1131,6 +1131,7 @@ struct kvm_ppc_resize_hpt { #define KVM_CAP_EXIT_ON_EMULATION_FAILURE 204 #define KVM_CAP_ARM_MTE 205 #define KVM_CAP_VM_MOVE_ENC_CONTEXT_FROM 206 +#define KVM_CAP_VM_GPA_BITS 207 #ifdef KVM_CAP_IRQ_ROUTING -- 2.25.1