diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
-rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 140 |
1 files changed, 110 insertions, 30 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 03d6c7f9b547..c6313c5d331c 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -647,6 +647,7 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, unsigned long stolen; unsigned long core_stolen; u64 now; + unsigned long flags; dt = vcpu->arch.dtl_ptr; vpa = vcpu->arch.vpa.pinned_addr; @@ -654,10 +655,10 @@ static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu, core_stolen = vcore_stolen_time(vc, now); stolen = core_stolen - vcpu->arch.stolen_logged; vcpu->arch.stolen_logged = core_stolen; - spin_lock_irq(&vcpu->arch.tbacct_lock); + spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags); stolen += vcpu->arch.busy_stolen; vcpu->arch.busy_stolen = 0; - spin_unlock_irq(&vcpu->arch.tbacct_lock); + spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags); if (!dt || !vpa) return; memset(dt, 0, sizeof(struct dtl_entry)); @@ -2085,7 +2086,7 @@ static void kvmppc_end_cede(struct kvm_vcpu *vcpu) } } -extern void __kvmppc_vcore_entry(void); +extern int __kvmppc_vcore_entry(void); static void kvmppc_remove_runnable(struct kvmppc_vcore *vc, struct kvm_vcpu *vcpu) @@ -2167,6 +2168,31 @@ static void radix_flush_cpu(struct kvm *kvm, int cpu, struct kvm_vcpu *vcpu) smp_call_function_single(cpu + i, do_nothing, NULL, 1); } +static void kvmppc_prepare_radix_vcpu(struct kvm_vcpu *vcpu, int pcpu) +{ + struct kvm *kvm = vcpu->kvm; + + /* + * With radix, the guest can do TLB invalidations itself, + * and it could choose to use the local form (tlbiel) if + * it is invalidating a translation that has only ever been + * used on one vcpu. However, that doesn't mean it has + * only ever been used on one physical cpu, since vcpus + * can move around between pcpus. To cope with this, when + * a vcpu moves from one pcpu to another, we need to tell + * any vcpus running on the same core as this vcpu previously + * ran to flush the TLB. The TLB is shared between threads, + * so we use a single bit in .need_tlb_flush for all 4 threads. + */ + if (vcpu->arch.prev_cpu != pcpu) { + if (vcpu->arch.prev_cpu >= 0 && + cpu_first_thread_sibling(vcpu->arch.prev_cpu) != + cpu_first_thread_sibling(pcpu)) + radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu); + vcpu->arch.prev_cpu = pcpu; + } +} + static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) { int cpu; @@ -2182,26 +2208,6 @@ static void kvmppc_start_thread(struct kvm_vcpu *vcpu, struct kvmppc_vcore *vc) cpu += vcpu->arch.ptid; vcpu->cpu = vc->pcpu; vcpu->arch.thread_cpu = cpu; - - /* - * With radix, the guest can do TLB invalidations itself, - * and it could choose to use the local form (tlbiel) if - * it is invalidating a translation that has only ever been - * used on one vcpu. However, that doesn't mean it has - * only ever been used on one physical cpu, since vcpus - * can move around between pcpus. To cope with this, when - * a vcpu moves from one pcpu to another, we need to tell - * any vcpus running on the same core as this vcpu previously - * ran to flush the TLB. The TLB is shared between threads, - * so we use a single bit in .need_tlb_flush for all 4 threads. - */ - if (kvm_is_radix(kvm) && vcpu->arch.prev_cpu != cpu) { - if (vcpu->arch.prev_cpu >= 0 && - cpu_first_thread_sibling(vcpu->arch.prev_cpu) != - cpu_first_thread_sibling(cpu)) - radix_flush_cpu(kvm, vcpu->arch.prev_cpu, vcpu); - vcpu->arch.prev_cpu = cpu; - } cpumask_set_cpu(cpu, &kvm->arch.cpu_in_guest); } tpaca = &paca[cpu]; @@ -2470,6 +2476,18 @@ static void collect_piggybacks(struct core_info *cip, int target_threads) spin_unlock(&lp->lock); } +static bool recheck_signals(struct core_info *cip) +{ + int sub, i; + struct kvm_vcpu *vcpu; + + for (sub = 0; sub < cip->n_subcores; ++sub) + for_each_runnable_thread(i, vcpu, cip->vc[sub]) + if (signal_pending(vcpu->arch.run_task)) + return true; + return false; +} + static void post_guest_process(struct kvmppc_vcore *vc, bool is_master) { int still_running = 0, i; @@ -2568,6 +2586,21 @@ static inline int kvmppc_set_host_core(unsigned int cpu) return 0; } +static void set_irq_happened(int trap) +{ + switch (trap) { + case BOOK3S_INTERRUPT_EXTERNAL: + local_paca->irq_happened |= PACA_IRQ_EE; + break; + case BOOK3S_INTERRUPT_H_DOORBELL: + local_paca->irq_happened |= PACA_IRQ_DBELL; + break; + case BOOK3S_INTERRUPT_HMI: + local_paca->irq_happened |= PACA_IRQ_HMI; + break; + } +} + /* * Run a set of guest threads on a physical core. * Called with vc->lock held. @@ -2587,6 +2620,7 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) int pcpu, thr; int target_threads; int controlled_threads; + int trap; /* * Remove from the list any threads that have a signal pending @@ -2638,6 +2672,43 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) if (vc->num_threads < target_threads) collect_piggybacks(&core_info, target_threads); + /* + * On radix, arrange for TLB flushing if necessary. + * This has to be done before disabling interrupts since + * it uses smp_call_function(). + */ + pcpu = smp_processor_id(); + if (kvm_is_radix(vc->kvm)) { + for (sub = 0; sub < core_info.n_subcores; ++sub) + for_each_runnable_thread(i, vcpu, core_info.vc[sub]) + kvmppc_prepare_radix_vcpu(vcpu, pcpu); + } + + /* + * Hard-disable interrupts, and check resched flag and signals. + * If we need to reschedule or deliver a signal, clean up + * and return without going into the guest(s). + */ + local_irq_disable(); + hard_irq_disable(); + if (lazy_irq_pending() || need_resched() || + recheck_signals(&core_info)) { + local_irq_enable(); + vc->vcore_state = VCORE_INACTIVE; + /* Unlock all except the primary vcore */ + for (sub = 1; sub < core_info.n_subcores; ++sub) { + pvc = core_info.vc[sub]; + /* Put back on to the preempted vcores list */ + kvmppc_vcore_preempt(pvc); + spin_unlock(&pvc->lock); + } + for (i = 0; i < controlled_threads; ++i) + kvmppc_release_hwthread(pcpu + i); + return; + } + + kvmppc_clear_host_core(pcpu); + /* Decide on micro-threading (split-core) mode */ subcore_size = threads_per_subcore; cmd_bit = stat_bit = 0; @@ -2665,7 +2736,6 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) /* order writes to split_info before kvm_split_mode pointer */ smp_wmb(); } - pcpu = smp_processor_id(); for (thr = 0; thr < controlled_threads; ++thr) paca[pcpu + thr].kvm_hstate.kvm_split_mode = sip; @@ -2685,8 +2755,6 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) } } - kvmppc_clear_host_core(pcpu); - /* Start all the threads */ active = 0; for (sub = 0; sub < core_info.n_subcores; ++sub) { @@ -2738,14 +2806,25 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) for (sub = 0; sub < core_info.n_subcores; ++sub) spin_unlock(&core_info.vc[sub]->lock); + /* + * Interrupts will be enabled once we get into the guest, + * so tell lockdep that we're about to enable interrupts. + */ + trace_hardirqs_on(); + guest_enter(); srcu_idx = srcu_read_lock(&vc->kvm->srcu); - __kvmppc_vcore_entry(); + trap = __kvmppc_vcore_entry(); srcu_read_unlock(&vc->kvm->srcu, srcu_idx); + guest_exit(); + + trace_hardirqs_off(); + set_irq_happened(trap); + spin_lock(&vc->lock); /* prevent other vcpu threads from doing kvmppc_start_thread() now */ vc->vcore_state = VCORE_EXITING; @@ -2773,6 +2852,10 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) split_info.do_nap = 0; } + kvmppc_set_host_core(pcpu); + + local_irq_enable(); + /* Let secondaries go back to the offline loop */ for (i = 0; i < controlled_threads; ++i) { kvmppc_release_hwthread(pcpu + i); @@ -2781,13 +2864,10 @@ static noinline void kvmppc_run_core(struct kvmppc_vcore *vc) cpumask_clear_cpu(pcpu + i, &vc->kvm->arch.cpu_in_guest); } - kvmppc_set_host_core(pcpu); - spin_unlock(&vc->lock); /* make sure updates to secondary vcpu structs are visible now */ smp_mb(); - guest_exit(); for (sub = 0; sub < core_info.n_subcores; ++sub) { pvc = core_info.vc[sub]; |