diff options
Diffstat (limited to 'drivers/kvm/kvm_main.c')
| -rw-r--r-- | drivers/kvm/kvm_main.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 4e1a017..633c2ed 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -41,6 +41,8 @@ #include <linux/fs.h> #include <linux/mount.h> #include <linux/sched.h> +#include <linux/cpumask.h> +#include <linux/smp.h> #include "x86_emulate.h" #include "segment_descriptor.h" @@ -309,6 +311,48 @@ static void vcpu_put(struct kvm_vcpu *vcpu) mutex_unlock(&vcpu->mutex); } +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; + cpumask_t cpus; + struct kvm_vcpu *vcpu; + atomic_t completed; + + atomic_set(&completed, 0); + cpus_clear(cpus); + needed = 0; + for (i = 0; i < kvm->nvcpus; ++i) { + vcpu = &kvm->vcpus[i]; + if (test_and_set_bit(KVM_TLB_FLUSH, &vcpu->requests)) + 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(); + } +} + static struct kvm *kvm_create_vm(void) { struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL); |