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Received: from CO6PR04MB7812.namprd04.prod.outlook.com (2603:10b6:303:138::6) by CO6PR04MB8330.namprd04.prod.outlook.com (2603:10b6:303:135::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.19; Fri, 26 Nov 2021 15:40:57 +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 15.20.4734.023; Fri, 26 Nov 2021 15:40:57 +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 2/4] RISC-V: KVM: Add VM capability to allow userspace get GPA size Date: Fri, 26 Nov 2021 21:10:18 +0530 Message-Id: <20211126154020.342924-3-anup.patel@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211126154020.342924-1-anup.patel@wdc.com> References: <20211126154020.342924-1-anup.patel@wdc.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MAXPR01CA0107.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:5d::25) To CO6PR04MB7812.namprd04.prod.outlook.com (2603:10b6:303:138::6) MIME-Version: 1.0 Received: from wdc.com (122.179.118.153) by MAXPR01CA0107.INDPRD01.PROD.OUTLOOK.COM (2603:1096:a00:5d::25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4734.20 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?2iVhKPFs4g3NfSwX5xUciiTT7T8KPLb8Zo8TRPaCZ1oAuI0QKLLyiIESo/0p?= =?us-ascii?Q?o01nXff0jX+eECAwyc56Jtj3AwFNeuLsGkOnGDZv4LIieNrpkUOPHZBkE402?= =?us-ascii?Q?8F8LjIwzPnZ+BWGNMfi1swzU9tJdSI1vvF+XHw0FSTDe4yz9zImbQoqRFBDV?= =?us-ascii?Q?ACEY6z4pS24CLICm5V9tDj0aBdsLwUZkc2w28EyrlnyQzLUfwruDxuDxDzxb?= =?us-ascii?Q?ivn4dbSnxuF+P2EJXPzDl3+DjMQfuOSWQfEINNjytRSV1E7M1pth8n8WRgDQ?= =?us-ascii?Q?8sp2lB6zeyK830/xR1nK5UY5fJcU9L5X7npGe4HmqDjSJsB+wsOpOjHqNTui?= =?us-ascii?Q?LsaiOSfe9UMfbBcpGv29pF0ioeNEPavv+QrJ9E05uEKCcfBrV0ChJFlnKi/W?= =?us-ascii?Q?qTywDY6QMOHs2nMd3CXAWejJ7e5FMBw8kk20ZokOgDHVrKH56NrHwTbFadTU?= =?us-ascii?Q?yskZ8ffcziPvN2p83dj63wsq1DkF7pM7wzomx3MDrMctObwWvNlkaXb5hyb4?= =?us-ascii?Q?XurKsaU/ztwuEzg66IwpidupWHOIh5mMV4KjqfBGlZVZRqJ98U3omSz2dg5M?= =?us-ascii?Q?n40xxTb+qaYGOtjibPD9pUHulbCayLnuRkNijS5injTyFfzxvvjDPmVuzgtw?= =?us-ascii?Q?0r5egxCvG27iHXvJBOsUJXaMO8kgFV6unRgcdUSkqoQ0C82XFh0V1r3TZPtB?= =?us-ascii?Q?94/pAra+UFDTVj48/hOwZ3hJHoEwScpLkiD+yTkjY9oRbvthhDFMJBnB4DGW?= =?us-ascii?Q?W1LMEaKNmE9LlaNIhLDlOYsQk7bXQeZ56dJTwTYho+yU6g/t7BMnVs2x6Cjn?= =?us-ascii?Q?SXDrGJNt5MN8FXSfZQOsQD7hTaQESZbdKfafnWGKFEYhMRATSg1JQR9qzpPy?= =?us-ascii?Q?5zKH/nt6Z07RnnukB8fzx1l980sLMP7Fk1M9G2Zaw27m021KjIf+wB0+9tXg?= =?us-ascii?Q?SsCZfomcfRMcuxO5GVOgQFnzM7nMuM/kJ4DEN3Eqc0xpHwekcnaDsLVrdWf5?= =?us-ascii?Q?ungveuvkLaKZyCfSofu7r8jbGAQ651fISP4nyOJAv79Zox1udCBYDHG1pilg?= =?us-ascii?Q?0wb3BP7TIwKfFU3iQvVRGbtM6KrH/b8g9HBp9N49Ft2w50uprmLrA18IjCxJ?= =?us-ascii?Q?6hYhIRbktmPYLlIhR0+VBxIuDr1VN8gAlXNwTFZ+BXjpIeKuvJLW5qOhWB/D?= =?us-ascii?Q?c2+PrYfn0Ej5cK6Z/l9Hl97WShf04Y/T2HPpq+nXYIK4Z//c5R/pafjymQ3w?= =?us-ascii?Q?St24cMfgY75H8HmkDthvF5pfn4tJNVLMT9vYXtrxunVeq2XyAfWza49H6Gpp?= =?us-ascii?Q?A0tjd2ODd64rAq5Bmtt+vv2ymowGtm7vtblbJHdeI5+iittchwjUI6f7x29m?= =?us-ascii?Q?JtFCuyoEfQUNRfJIn/zdFkP1r5daDyBq62b+LcO7zu9reYPsUbZPKE2HfLZz?= =?us-ascii?Q?8g4oOyrvDMrsNCKyAdYJIxlw2C49Rh3Lc7itc6sV6q3Qskf87bHKqjen28M4?= =?us-ascii?Q?havhNqxtwLS0rJKPZL3Df1aCD8d5A/VHZ4EDB4oL98+OQfghoa0QHs1x7tnA?= =?us-ascii?Q?XVllWAZqygxOkCGFNxr7X0D9shXYAc4v8T1t9hCv/3MkmcsyyjtDqUS9HWeZ?= =?us-ascii?Q?swZlR/64tq0p+sR4E4TPriw=3D?= X-OriginatorOrg: wdc.com X-MS-Exchange-CrossTenant-Network-Message-Id: 095abe3d-d703-41dc-5f2f-08d9b0f3235a X-MS-Exchange-CrossTenant-AuthSource: CO6PR04MB7812.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Nov 2021 15:40:56.9677 (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: x0QGzurF1kkvDAI3JxTYM1eqRQN9S9B2+ddKcWrbd/cD0fVt+6VpHJm1BKabQ1Uya/+vr0DYY1uT+H8W9aDkGA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CO6PR04MB8330 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The GPA size supported for a RISC-V Guest/VM is based on the MMU mode used by 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 RISC-V specific VM capability KVM_CAP_RISCV_VM_GPA_SIZE which can be used by KVM userspace to get guest physical address (GPA) size (i.e. number of GPA 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..ae97f6929897 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_RISCV_VM_GPA_SIZE: + 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..dac98df3101d 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_RISCV_VM_GPA_SIZE 207 #ifdef KVM_CAP_IRQ_ROUTING -- 2.25.1