diff options
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 112 |
1 files changed, 109 insertions, 3 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c05d47701292..3cd4d091c2f3 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -43,6 +43,7 @@ #include <linux/slab.h> #include <linux/perf_event.h> #include <linux/uaccess.h> +#include <linux/hash.h> #include <trace/events/kvm.h> #define CREATE_TRACE_POINTS @@ -155,6 +156,13 @@ struct kvm_stats_debugfs_item debugfs_entries[] = { u64 __read_mostly host_xcr0; +static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu) +{ + int i; + for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++) + vcpu->arch.apf.gfns[i] = ~0; +} + static void kvm_on_user_return(struct user_return_notifier *urn) { unsigned slot; @@ -5115,6 +5123,12 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu) vcpu->fpu_active = 0; kvm_x86_ops->fpu_deactivate(vcpu); } + if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) { + /* Page is swapped out. Do synthetic halt */ + vcpu->arch.apf.halted = true; + r = 1; + goto out; + } } r = kvm_mmu_reload(vcpu); @@ -5243,7 +5257,8 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) r = 1; while (r > 0) { - if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) + if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && + !vcpu->arch.apf.halted) r = vcpu_enter_guest(vcpu); else { srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx); @@ -5256,6 +5271,7 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE; case KVM_MP_STATE_RUNNABLE: + vcpu->arch.apf.halted = false; break; case KVM_MP_STATE_SIPI_RECEIVED: default: @@ -5277,6 +5293,9 @@ static int __vcpu_run(struct kvm_vcpu *vcpu) vcpu->run->exit_reason = KVM_EXIT_INTR; ++vcpu->stat.request_irq_exits; } + + kvm_check_async_pf_completion(vcpu); + if (signal_pending(current)) { r = -EINTR; vcpu->run->exit_reason = KVM_EXIT_INTR; @@ -5792,6 +5811,10 @@ int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu) kvm_make_request(KVM_REQ_EVENT, vcpu); + kvm_clear_async_pf_completion_queue(vcpu); + kvm_async_pf_hash_reset(vcpu); + vcpu->arch.apf.halted = false; + return kvm_x86_ops->vcpu_reset(vcpu); } @@ -5880,6 +5903,8 @@ int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu) if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) goto fail_free_mce_banks; + kvm_async_pf_hash_reset(vcpu); + return 0; fail_free_mce_banks: kfree(vcpu->arch.mce_banks); @@ -5938,8 +5963,10 @@ static void kvm_free_vcpus(struct kvm *kvm) /* * Unpin any mmu pages first. */ - kvm_for_each_vcpu(i, vcpu, kvm) + kvm_for_each_vcpu(i, vcpu, kvm) { + kvm_clear_async_pf_completion_queue(vcpu); kvm_unload_vcpu_mmu(vcpu); + } kvm_for_each_vcpu(i, vcpu, kvm) kvm_arch_vcpu_free(vcpu); @@ -6050,7 +6077,9 @@ void kvm_arch_flush_shadow(struct kvm *kvm) int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu) { - return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE + return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE && + !vcpu->arch.apf.halted) + || !list_empty_careful(&vcpu->async_pf.done) || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED || vcpu->arch.nmi_pending || (kvm_arch_interrupt_allowed(vcpu) && @@ -6109,6 +6138,83 @@ void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags) } EXPORT_SYMBOL_GPL(kvm_set_rflags); +static inline u32 kvm_async_pf_hash_fn(gfn_t gfn) +{ + return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU)); +} + +static inline u32 kvm_async_pf_next_probe(u32 key) +{ + return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1); +} + +static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + u32 key = kvm_async_pf_hash_fn(gfn); + + while (vcpu->arch.apf.gfns[key] != ~0) + key = kvm_async_pf_next_probe(key); + + vcpu->arch.apf.gfns[key] = gfn; +} + +static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + int i; + u32 key = kvm_async_pf_hash_fn(gfn); + + for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) && + (vcpu->arch.apf.gfns[key] != gfn || + vcpu->arch.apf.gfns[key] == ~0); i++) + key = kvm_async_pf_next_probe(key); + + return key; +} + +bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn; +} + +static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + u32 i, j, k; + + i = j = kvm_async_pf_gfn_slot(vcpu, gfn); + while (true) { + vcpu->arch.apf.gfns[i] = ~0; + do { + j = kvm_async_pf_next_probe(j); + if (vcpu->arch.apf.gfns[j] == ~0) + return; + k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]); + /* + * k lies cyclically in ]i,j] + * | i.k.j | + * |....j i.k.| or |.k..j i...| + */ + } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j)); + vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j]; + i = j; + } +} + +void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work) +{ + trace_kvm_async_pf_not_present(work->gva); + + kvm_make_request(KVM_REQ_APF_HALT, vcpu); + kvm_add_async_pf_gfn(vcpu, work->arch.gfn); +} + +void kvm_arch_async_page_present(struct kvm_vcpu *vcpu, + struct kvm_async_pf *work) +{ + trace_kvm_async_pf_ready(work->gva); + kvm_del_async_pf_gfn(vcpu, work->arch.gfn); +} + EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq); EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault); |