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Date: Mon, 30 Mar 2020 06:23:26 +0000 Message-Id: <21b2119906f4cce10b4133107ece3dab0957c07c.1585548051.git.ashish.kalra@amd.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: Content-Type: text/plain X-ClientProxiedBy: DM6PR02CA0096.namprd02.prod.outlook.com (2603:10b6:5:1f4::37) To DM5PR12MB1386.namprd12.prod.outlook.com (2603:10b6:3:77::9) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from ashkalra_ubuntu_server.amd.com (165.204.77.1) by DM6PR02CA0096.namprd02.prod.outlook.com (2603:10b6:5:1f4::37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2856.20 via Frontend Transport; Mon, 30 Mar 2020 06:23:34 +0000 X-Mailer: git-send-email 2.17.1 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: e38c1e90-9419-4a48-3c8e-08d7d472e056 X-MS-TrafficTypeDiagnostic: DM5PR12MB1692:|DM5PR12MB1692: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; X-Forefront-PRVS: 0358535363 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM5PR12MB1386.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFTY:;SFS:(10009020)(4636009)(346002)(136003)(366004)(39860400002)(396003)(376002)(66556008)(86362001)(66476007)(478600001)(2616005)(956004)(81166006)(52116002)(8676002)(81156014)(6916009)(7696005)(8936002)(5660300002)(6666004)(6486002)(16526019)(186003)(26005)(66946007)(316002)(7416002)(2906002)(4326008)(36756003)(136400200001);DIR:OUT;SFP:1101; Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: plVQo4DVukju9H6S0qzUp69W/hzt4lfpljb0/sVYlPKWTXJM0z+ynaiS49AC4RTO2sAk5o8XhOIPJsaejqPe6LvMxjLWw7drVOl9KkhPfPMs6/xC/m4Q+DN4CcURR+ElspdFHAdMHJLsN/OG+YmJ3w== X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: e38c1e90-9419-4a48-3c8e-08d7d472e056 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Mar 2020 06:23:35.2702 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: oV0LukUhjbZ5QGDlNCZn1We9xuR7hY1qN4ZRym1j+ykEeY7j+Qm5uhoVaaFvSEXTLiMGe5EFxiR2qlSvqzpDHA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1692 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ashish Kalra Add new KVM_FEATURE_SEV_LIVE_MIGRATION feature for guest to check for host-side support for SEV live migration. Also add a new custom MSR_KVM_SEV_LIVE_MIG_EN for guest to enable the SEV live migration feature. Also, ensure that _bss_decrypted section is marked as decrypted in the page encryption bitmap. Signed-off-by: Ashish Kalra --- Documentation/virt/kvm/cpuid.rst | 4 ++++ Documentation/virt/kvm/msr.rst | 10 ++++++++++ arch/x86/include/asm/kvm_host.h | 3 +++ arch/x86/include/uapi/asm/kvm_para.h | 5 +++++ arch/x86/kernel/kvm.c | 4 ++++ arch/x86/kvm/cpuid.c | 3 ++- arch/x86/kvm/svm.c | 5 +++++ arch/x86/kvm/x86.c | 7 +++++++ arch/x86/mm/mem_encrypt.c | 14 +++++++++++++- 9 files changed, 53 insertions(+), 2 deletions(-) diff --git a/Documentation/virt/kvm/cpuid.rst b/Documentation/virt/kvm/cpuid.rst index 01b081f6e7ea..fcb191bb3016 100644 --- a/Documentation/virt/kvm/cpuid.rst +++ b/Documentation/virt/kvm/cpuid.rst @@ -86,6 +86,10 @@ KVM_FEATURE_PV_SCHED_YIELD 13 guest checks this feature bit before using paravirtualized sched yield. +KVM_FEATURE_SEV_LIVE_MIGRATION 14 guest checks this feature bit + before enabling SEV live + migration feature. + KVM_FEATURE_CLOCSOURCE_STABLE_BIT 24 host will warn if no guest-side per-cpu warps are expeced in kvmclock diff --git a/Documentation/virt/kvm/msr.rst b/Documentation/virt/kvm/msr.rst index 33892036672d..7cd7786bbb03 100644 --- a/Documentation/virt/kvm/msr.rst +++ b/Documentation/virt/kvm/msr.rst @@ -319,3 +319,13 @@ data: KVM guests can request the host not to poll on HLT, for example if they are performing polling themselves. + +MSR_KVM_SEV_LIVE_MIG_EN: + 0x4b564d06 + + Control SEV Live Migration features. + +data: + Bit 0 enables (1) or disables (0) host-side SEV Live Migration feature. + Bit 1 enables (1) or disables (0) support for SEV Live Migration extensions. + All other bits are reserved. diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index a96ef6338cd2..ad5faaed43c0 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -780,6 +780,9 @@ struct kvm_vcpu_arch { u64 msr_kvm_poll_control; + /* SEV Live Migration MSR (AMD only) */ + u64 msr_kvm_sev_live_migration_flag; + /* * Indicates the guest is trying to write a gfn that contains one or * more of the PTEs used to translate the write itself, i.e. the access diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h index 2a8e0b6b9805..d9d4953b42ad 100644 --- a/arch/x86/include/uapi/asm/kvm_para.h +++ b/arch/x86/include/uapi/asm/kvm_para.h @@ -31,6 +31,7 @@ #define KVM_FEATURE_PV_SEND_IPI 11 #define KVM_FEATURE_POLL_CONTROL 12 #define KVM_FEATURE_PV_SCHED_YIELD 13 +#define KVM_FEATURE_SEV_LIVE_MIGRATION 14 #define KVM_HINTS_REALTIME 0 @@ -50,6 +51,7 @@ #define MSR_KVM_STEAL_TIME 0x4b564d03 #define MSR_KVM_PV_EOI_EN 0x4b564d04 #define MSR_KVM_POLL_CONTROL 0x4b564d05 +#define MSR_KVM_SEV_LIVE_MIG_EN 0x4b564d06 struct kvm_steal_time { __u64 steal; @@ -122,4 +124,7 @@ struct kvm_vcpu_pv_apf_data { #define KVM_PV_EOI_ENABLED KVM_PV_EOI_MASK #define KVM_PV_EOI_DISABLED 0x0 +#define KVM_SEV_LIVE_MIGRATION_ENABLED (1 << 0) +#define KVM_SEV_LIVE_MIGRATION_EXTENSIONS_SUPPORTED (1 << 1) + #endif /* _UAPI_ASM_X86_KVM_PARA_H */ diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index 6efe0410fb72..8fcee0b45231 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -418,6 +418,10 @@ static void __init sev_map_percpu_data(void) if (!sev_active()) return; + if (kvm_para_has_feature(KVM_FEATURE_SEV_LIVE_MIGRATION)) { + wrmsrl(MSR_KVM_SEV_LIVE_MIG_EN, KVM_SEV_LIVE_MIGRATION_ENABLED); + } + for_each_possible_cpu(cpu) { __set_percpu_decrypted(&per_cpu(apf_reason, cpu), sizeof(apf_reason)); __set_percpu_decrypted(&per_cpu(steal_time, cpu), sizeof(steal_time)); diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index b1c469446b07..74c8b2a7270c 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -716,7 +716,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_entry2 *entry, u32 function, (1 << KVM_FEATURE_ASYNC_PF_VMEXIT) | (1 << KVM_FEATURE_PV_SEND_IPI) | (1 << KVM_FEATURE_POLL_CONTROL) | - (1 << KVM_FEATURE_PV_SCHED_YIELD); + (1 << KVM_FEATURE_PV_SCHED_YIELD) | + (1 << KVM_FEATURE_SEV_LIVE_MIGRATION); if (sched_info_on()) entry->eax |= (1 << KVM_FEATURE_STEAL_TIME); diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index c99b0207a443..60ddc242a133 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -7632,6 +7632,7 @@ static int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa, unsigned long npages, unsigned long enc) { struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + struct kvm_vcpu *vcpu = kvm->vcpus[0]; kvm_pfn_t pfn_start, pfn_end; gfn_t gfn_start, gfn_end; int ret; @@ -7639,6 +7640,10 @@ static int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa, if (!sev_guest(kvm)) return -EINVAL; + if (!(vcpu->arch.msr_kvm_sev_live_migration_flag & + KVM_SEV_LIVE_MIGRATION_ENABLED)) + return -ENOTTY; + if (!npages) return 0; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 2127ed937f53..82867b8798f8 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2880,6 +2880,10 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) vcpu->arch.msr_kvm_poll_control = data; break; + case MSR_KVM_SEV_LIVE_MIG_EN: + vcpu->arch.msr_kvm_sev_live_migration_flag = data; + break; + case MSR_IA32_MCG_CTL: case MSR_IA32_MCG_STATUS: case MSR_IA32_MC0_CTL ... MSR_IA32_MCx_CTL(KVM_MAX_MCE_BANKS) - 1: @@ -3126,6 +3130,9 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_KVM_POLL_CONTROL: msr_info->data = vcpu->arch.msr_kvm_poll_control; break; + case MSR_KVM_SEV_LIVE_MIG_EN: + msr_info->data = vcpu->arch.msr_kvm_sev_live_migration_flag; + break; case MSR_IA32_P5_MC_ADDR: case MSR_IA32_P5_MC_TYPE: case MSR_IA32_MCG_CAP: diff --git a/arch/x86/mm/mem_encrypt.c b/arch/x86/mm/mem_encrypt.c index c9800fa811f6..f6a841494845 100644 --- a/arch/x86/mm/mem_encrypt.c +++ b/arch/x86/mm/mem_encrypt.c @@ -502,8 +502,20 @@ void __init mem_encrypt_init(void) * With SEV, we need to make a hypercall when page encryption state is * changed. */ - if (sev_active()) + if (sev_active()) { + unsigned long nr_pages; + pv_ops.mmu.page_encryption_changed = set_memory_enc_dec_hypercall; + + /* + * Ensure that _bss_decrypted section is marked as decrypted in the + * page encryption bitmap. + */ + nr_pages = DIV_ROUND_UP(__end_bss_decrypted - __start_bss_decrypted, + PAGE_SIZE); + set_memory_enc_dec_hypercall((unsigned long)__start_bss_decrypted, + nr_pages, 0); + } #endif pr_info("AMD %s active\n", -- 2.17.1