diff options
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 37 |
1 files changed, 13 insertions, 24 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index af2d288c881d..07ae280e8fe5 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -198,21 +198,15 @@ static void vcpu_put(struct kvm_vcpu *vcpu) static void ack_flush(void *_completed) { - atomic_t *completed = _completed; - - atomic_inc(completed); } void kvm_flush_remote_tlbs(struct kvm *kvm) { - int i, cpu, needed; + int i, cpu; cpumask_t cpus; struct kvm_vcpu *vcpu; - atomic_t completed; - atomic_set(&completed, 0); cpus_clear(cpus); - needed = 0; for (i = 0; i < KVM_MAX_VCPUS; ++i) { vcpu = kvm->vcpus[i]; if (!vcpu) @@ -221,23 +215,9 @@ void kvm_flush_remote_tlbs(struct kvm *kvm) continue; cpu = vcpu->cpu; if (cpu != -1 && cpu != raw_smp_processor_id()) - if (!cpu_isset(cpu, cpus)) { - cpu_set(cpu, cpus); - ++needed; - } - } - - /* - * We really want smp_call_function_mask() here. But that's not - * available, so ipi all cpus in parallel and wait for them - * to complete. - */ - for (cpu = first_cpu(cpus); cpu != NR_CPUS; cpu = next_cpu(cpu, cpus)) - smp_call_function_single(cpu, ack_flush, &completed, 1, 0); - while (atomic_read(&completed) != needed) { - cpu_relax(); - barrier(); + cpu_set(cpu, cpus); } + smp_call_function_mask(cpus, ack_flush, NULL, 1); } int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id) @@ -2054,12 +2034,21 @@ again: kvm_x86_ops->run(vcpu, kvm_run); - kvm_guest_exit(); vcpu->guest_mode = 0; local_irq_enable(); ++vcpu->stat.exits; + /* + * We must have an instruction between local_irq_enable() and + * kvm_guest_exit(), so the timer interrupt isn't delayed by + * the interrupt shadow. The stat.exits increment will do nicely. + * But we need to prevent reordering, hence this barrier(): + */ + barrier(); + + kvm_guest_exit(); + preempt_enable(); /* |
