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Sun, 11 Jun 2023 23:38:12 -0500 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh , Pavan Kumar Paluri Subject: [PATCH RFC v9 28/51] KVM: SVM: Add KVM_SNP_INIT command Date: Sun, 11 Jun 2023 23:25:36 -0500 Message-ID: <20230612042559.375660-29-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230612042559.375660-1-michael.roth@amd.com> References: <20230612042559.375660-1-michael.roth@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000042A8:EE_|DS0PR12MB8344:EE_ X-MS-Office365-Filtering-Correlation-Id: b2939f41-0cc9-441f-db32-08db6afed560 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:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(346002)(376002)(396003)(39860400002)(136003)(451199021)(36840700001)(46966006)(40470700004)(5660300002)(7406005)(7416002)(70586007)(8936002)(8676002)(316002)(40480700001)(70206006)(6916009)(4326008)(41300700001)(54906003)(44832011)(2906002)(40460700003)(356005)(82740400003)(26005)(86362001)(81166007)(16526019)(1076003)(186003)(36756003)(36860700001)(336012)(426003)(2616005)(478600001)(82310400005)(47076005)(83380400001)(6666004)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Jun 2023 04:38:13.5782 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b2939f41-0cc9-441f-db32-08db6afed560 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF000042A8.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8344 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE, T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org From: Brijesh Singh The KVM_SNP_INIT command is used by the hypervisor to initialize the SEV-SNP platform context. In a typical workflow, this command should be the first command issued. When creating SEV-SNP guest, the VMM must use this command instead of the KVM_SEV_INIT or KVM_SEV_ES_INIT. The flags value must be zero, it will be extended in future SNP support to communicate the optional features (such as restricted INT injection etc). Co-developed-by: Pavan Kumar Paluri Signed-off-by: Pavan Kumar Paluri Signed-off-by: Brijesh Singh Signed-off-by: Ashish Kalra Signed-off-by: Michael Roth --- .../virt/kvm/x86/amd-memory-encryption.rst | 27 +++++++++++++ arch/x86/include/asm/svm.h | 1 + arch/x86/kvm/svm/sev.c | 39 ++++++++++++++++++- arch/x86/kvm/svm/svm.h | 4 ++ include/uapi/linux/kvm.h | 13 +++++++ 5 files changed, 83 insertions(+), 1 deletion(-) diff --git a/Documentation/virt/kvm/x86/amd-memory-encryption.rst b/Documentation/virt/kvm/x86/amd-memory-encryption.rst index 487b6328b3e7..1240d28badd6 100644 --- a/Documentation/virt/kvm/x86/amd-memory-encryption.rst +++ b/Documentation/virt/kvm/x86/amd-memory-encryption.rst @@ -434,6 +434,33 @@ issued by the hypervisor to make the guest ready for execution. Returns: 0 on success, -negative on error +18. KVM_SNP_INIT +---------------- + +The KVM_SNP_INIT command can be used by the hypervisor to initialize SEV-SNP +context. In a typical workflow, this command should be the first command issued. + +Parameters (in/out): struct kvm_snp_init + +Returns: 0 on success, -negative on error + +:: + + struct kvm_snp_init { + __u64 flags; + }; + +The flags bitmap is defined as:: + + /* enable the restricted injection */ + #define KVM_SEV_SNP_RESTRICTED_INJET (1<<0) + + /* enable the restricted injection timer */ + #define KVM_SEV_SNP_RESTRICTED_TIMER_INJET (1<<1) + +If the specified flags is not supported then return -EOPNOTSUPP, and the supported +flags are returned. + References ========== diff --git a/arch/x86/include/asm/svm.h b/arch/x86/include/asm/svm.h index e7c7379d6ac7..ac8edfdd60fa 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -288,6 +288,7 @@ static_assert((X2AVIC_MAX_PHYSICAL_ID & AVIC_PHYSICAL_MAX_INDEX_MASK) == X2AVIC_ #define AVIC_HPA_MASK ~((0xFFFULL << 52) | 0xFFF) +#define SVM_SEV_FEAT_SNP_ACTIVE BIT(0) struct vmcb_seg { u16 selector; diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index f5fcf6c33583..70e0576a32d0 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -243,6 +243,25 @@ static void sev_unbind_asid(struct kvm *kvm, unsigned int handle) sev_decommission(handle); } +static int verify_snp_init_flags(struct kvm *kvm, struct kvm_sev_cmd *argp) +{ + struct kvm_snp_init params; + int ret = 0; + + if (copy_from_user(¶ms, (void __user *)(uintptr_t)argp->data, sizeof(params))) + return -EFAULT; + + if (params.flags & ~SEV_SNP_SUPPORTED_FLAGS) + ret = -EOPNOTSUPP; + + params.flags = SEV_SNP_SUPPORTED_FLAGS; + + if (copy_to_user((void __user *)(uintptr_t)argp->data, ¶ms, sizeof(params))) + ret = -EFAULT; + + return ret; +} + static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) { struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; @@ -256,12 +275,19 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) return ret; sev->active = true; - sev->es_active = argp->id == KVM_SEV_ES_INIT; + sev->es_active = (argp->id == KVM_SEV_ES_INIT || argp->id == KVM_SEV_SNP_INIT); + sev->snp_active = argp->id == KVM_SEV_SNP_INIT; asid = sev_asid_new(sev); if (asid < 0) goto e_no_asid; sev->asid = asid; + if (sev->snp_active) { + ret = verify_snp_init_flags(kvm, argp); + if (ret) + goto e_free; + } + ret = sev_platform_init(&argp->error); if (ret) goto e_free; @@ -277,6 +303,7 @@ static int sev_guest_init(struct kvm *kvm, struct kvm_sev_cmd *argp) sev_asid_free(sev); sev->asid = 0; e_no_asid: + sev->snp_active = false; sev->es_active = false; sev->active = false; return ret; @@ -612,6 +639,10 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm) save->xss = svm->vcpu.arch.ia32_xss; save->dr6 = svm->vcpu.arch.dr6; + /* Enable the SEV-SNP feature */ + if (sev_snp_guest(svm->vcpu.kvm)) + save->sev_features |= SVM_SEV_FEAT_SNP_ACTIVE; + pr_debug("Virtual Machine Save Area (VMSA):\n"); print_hex_dump_debug("", DUMP_PREFIX_NONE, 16, 1, save, sizeof(*save), false); @@ -1864,6 +1895,12 @@ int sev_mem_enc_ioctl(struct kvm *kvm, void __user *argp) } switch (sev_cmd.id) { + case KVM_SEV_SNP_INIT: + if (!sev_snp_enabled) { + r = -ENOTTY; + goto out; + } + fallthrough; case KVM_SEV_ES_INIT: if (!sev_es_enabled) { r = -ENOTTY; diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 6974d63c84f9..4360cf04f53a 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -74,6 +74,9 @@ enum { /* TPR and CR2 are always written before VMRUN */ #define VMCB_ALWAYS_DIRTY_MASK ((1U << VMCB_INTR) | (1U << VMCB_CR2)) +/* Supported init feature flags */ +#define SEV_SNP_SUPPORTED_FLAGS 0x0 + struct kvm_sev_info { bool active; /* SEV enabled guest */ bool es_active; /* SEV-ES enabled guest */ @@ -89,6 +92,7 @@ struct kvm_sev_info { struct list_head mirror_entry; /* Use as a list entry of mirrors */ struct misc_cg *misc_cg; /* For misc cgroup accounting */ atomic_t migration_in_progress; + u64 snp_init_flags; }; struct kvm_svm { diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 0fa665e8862a..43b6291e3a80 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1926,6 +1926,9 @@ enum sev_cmd_id { /* Guest Migration Extension */ KVM_SEV_SEND_CANCEL, + /* SNP specific commands */ + KVM_SEV_SNP_INIT, + KVM_SEV_NR_MAX, }; @@ -2022,6 +2025,16 @@ struct kvm_sev_receive_update_data { __u32 trans_len; }; +/* enable the restricted injection */ +#define KVM_SEV_SNP_RESTRICTED_INJET (1 << 0) + +/* enable the restricted injection timer */ +#define KVM_SEV_SNP_RESTRICTED_TIMER_INJET (1 << 1) + +struct kvm_snp_init { + __u64 flags; +}; + #define KVM_DEV_ASSIGN_ENABLE_IOMMU (1 << 0) #define KVM_DEV_ASSIGN_PCI_2_3 (1 << 1) #define KVM_DEV_ASSIGN_MASK_INTX (1 << 2) -- 2.25.1