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Also add a new custom MSR_KVM_SEV_LIVE_MIG_EN for guest to enable the SEV live migration feature. Signed-off-by: Ashish Kalra --- Documentation/virt/kvm/cpuid.rst | 5 +++++ Documentation/virt/kvm/msr.rst | 16 ++++++++++++++++ arch/x86/include/uapi/asm/kvm_para.h | 5 +++++ arch/x86/kvm/svm/sev.c | 14 ++++++++++++++ arch/x86/kvm/svm/svm.c | 16 ++++++++++++++++ arch/x86/kvm/svm/svm.h | 2 ++ 6 files changed, 58 insertions(+) diff --git a/Documentation/virt/kvm/cpuid.rst b/Documentation/virt/kvm/cpuid.rst index cf62162d4be2..0bdb6cdb12d3 100644 --- a/Documentation/virt/kvm/cpuid.rst +++ b/Documentation/virt/kvm/cpuid.rst @@ -96,6 +96,11 @@ KVM_FEATURE_MSI_EXT_DEST_ID 15 guest checks this feature bit before using extended destination ID bits in MSI address bits 11-5. +KVM_FEATURE_SEV_LIVE_MIGRATION 16 guest checks this feature bit before + using the page encryption state + hypercall to notify the page state + change + KVM_FEATURE_CLOCKSOURCE_STABLE_BIT 24 host will warn if no guest-side per-cpu warps are expected in kvmclock diff --git a/Documentation/virt/kvm/msr.rst b/Documentation/virt/kvm/msr.rst index e37a14c323d2..ffac027aba5b 100644 --- a/Documentation/virt/kvm/msr.rst +++ b/Documentation/virt/kvm/msr.rst @@ -376,3 +376,19 @@ data: write '1' to bit 0 of the MSR, this causes the host to re-scan its queue and check if there are more notifications pending. The MSR is available if KVM_FEATURE_ASYNC_PF_INT is present in CPUID. + +MSR_KVM_SEV_LIVE_MIG_EN: + 0x4b564d08 + + Control SEV Live Migration features. + +data: + Bit 0 enables (1) or disables (0) host-side SEV Live Migration feature, + in other words, this is guest->host communication that it's properly + handling the encryption bitmap. + + Bit 1 enables (1) or disables (0) support for SEV Live Migration extensions, + any future extensions related to this live migration support, such as + extensions/support for accelerated migration, etc. + + All other bits are reserved. diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h index 950afebfba88..0e8e59115ce2 100644 --- a/arch/x86/include/uapi/asm/kvm_para.h +++ b/arch/x86/include/uapi/asm/kvm_para.h @@ -33,6 +33,7 @@ #define KVM_FEATURE_PV_SCHED_YIELD 13 #define KVM_FEATURE_ASYNC_PF_INT 14 #define KVM_FEATURE_MSI_EXT_DEST_ID 15 +#define KVM_FEATURE_SEV_LIVE_MIGRATION 16 #define KVM_HINTS_REALTIME 0 @@ -54,6 +55,7 @@ #define MSR_KVM_POLL_CONTROL 0x4b564d05 #define MSR_KVM_ASYNC_PF_INT 0x4b564d06 #define MSR_KVM_ASYNC_PF_ACK 0x4b564d07 +#define MSR_KVM_SEV_LIVE_MIG_EN 0x4b564d08 struct kvm_steal_time { __u64 steal; @@ -136,4 +138,7 @@ 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/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index b87b6225d2da..83565e35fa09 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -1483,6 +1483,17 @@ int svm_page_enc_status_hc(struct kvm *kvm, unsigned long gpa, return 0; } +void sev_update_migration_flags(struct kvm *kvm, u64 data) +{ + struct kvm_sev_info *sev = &to_kvm_svm(kvm)->sev_info; + + if (!sev_guest(kvm)) + return; + + if (data & KVM_SEV_LIVE_MIGRATION_ENABLED) + sev->live_migration_enabled = true; +} + int svm_get_page_enc_bitmap(struct kvm *kvm, struct kvm_page_enc_bitmap *bmap) { @@ -1495,6 +1506,9 @@ int svm_get_page_enc_bitmap(struct kvm *kvm, if (!sev_guest(kvm)) return -ENOTTY; + if (!sev->live_migration_enabled) + return -EINVAL; + gfn_start = bmap->start_gfn; gfn_end = gfn_start + bmap->num_pages; diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 7aa7858c8209..6f47db7b8805 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -2765,6 +2765,9 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) svm->msr_decfg = data; break; } + case MSR_KVM_SEV_LIVE_MIG_EN: + sev_update_migration_flags(vcpu->kvm, data); + break; case MSR_IA32_APICBASE: if (kvm_vcpu_apicv_active(vcpu)) avic_update_vapic_bar(to_svm(vcpu), data); @@ -3769,6 +3772,19 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu) vcpu->arch.cr3_lm_rsvd_bits &= ~(1UL << (best->ebx & 0x3f)); } + /* + * If SEV guest then enable the Live migration feature. + */ + if (sev_guest(vcpu->kvm)) { + struct kvm_cpuid_entry2 *best; + + best = kvm_find_cpuid_entry(vcpu, KVM_CPUID_FEATURES, 0); + if (!best) + return; + + best->eax |= (1 << KVM_FEATURE_SEV_LIVE_MIGRATION); + } + if (!kvm_vcpu_apicv_active(vcpu)) return; diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h index 5a4656bad681..d1f503dc2584 100644 --- a/arch/x86/kvm/svm/svm.h +++ b/arch/x86/kvm/svm/svm.h @@ -66,6 +66,7 @@ struct kvm_sev_info { int fd; /* SEV device fd */ unsigned long pages_locked; /* Number of pages locked */ struct list_head regions_list; /* List of registered regions */ + bool live_migration_enabled; unsigned long *page_enc_bmap; unsigned long page_enc_bmap_size; }; @@ -505,5 +506,6 @@ int svm_unregister_enc_region(struct kvm *kvm, void pre_sev_run(struct vcpu_svm *svm, int cpu); int __init sev_hardware_setup(void); void sev_hardware_teardown(void); +void sev_update_migration_flags(struct kvm *kvm, u64 data); #endif -- 2.17.1