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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by MN1PEPF0000ECD6.mail.protection.outlook.com (10.167.242.135) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7159.9 via Frontend Transport; Sat, 30 Dec 2023 17:26:47 +0000 Received: from localhost (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.34; Sat, 30 Dec 2023 11:26:46 -0600 From: Michael Roth To: CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Brijesh Singh , Pavan Kumar Paluri Subject: [PATCH v11 15/35] KVM: SEV: Add KVM_SNP_INIT command Date: Sat, 30 Dec 2023 11:23:31 -0600 Message-ID: <20231230172351.574091-16-michael.roth@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20231230172351.574091-1-michael.roth@amd.com> References: <20231230172351.574091-1-michael.roth@amd.com> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MN1PEPF0000ECD6:EE_|LV8PR12MB9333:EE_ X-MS-Office365-Filtering-Correlation-Id: 87b25a2e-5618-45eb-651e-08dc095c8036 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Dec 2023 17:26:47.1988 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 87b25a2e-5618-45eb-651e-08dc095c8036 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: MN1PEPF0000ECD6.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9333 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 995780088eb2..b1a19c9a577a 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 87a7b917d30e..ba8ce15b27d7 100644 --- a/arch/x86/include/asm/svm.h +++ b/arch/x86/include/asm/svm.h @@ -286,6 +286,7 @@ static_assert((X2AVIC_MAX_PHYSICAL_ID & AVIC_PHYSICAL_MAX_INDEX_MASK) == X2AVIC_ #define AVIC_HPA_MASK ~((0xFFFULL << 52) | 0xFFF) #define SVM_SEV_FEAT_DEBUG_SWAP BIT(5) +#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 18c09863377b..43b8ae7b74f8 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -250,6 +250,25 @@ 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; @@ -264,12 +283,19 @@ 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; + } + init_args.probe = false; ret = sev_platform_init(&init_args); if (ret) @@ -287,6 +313,7 @@ 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; @@ -625,6 +652,10 @@ static int sev_es_sync_vmsa(struct vcpu_svm *svm) if (sev_es_debug_swap_enabled) save->sev_features |= SVM_SEV_FEAT_DEBUG_SWAP; + /* 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); @@ -1883,6 +1914,12 @@ 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 a3e27c82866b..07a9eb5b6ce5 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -76,6 +76,9 @@ 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 */ @@ -91,6 +94,7 @@ 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 c3308536482b..73702e9b9d76 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -1869,6 +1869,9 @@ enum sev_cmd_id { /* Guest Migration Extension */ KVM_SEV_SEND_CANCEL, + /* SNP specific commands */ + KVM_SEV_SNP_INIT, + KVM_SEV_NR_MAX, }; @@ -1965,6 +1968,16 @@ 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)