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KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs()

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In kvm_flush_remote_tlbs(), replace a loop using smp_call_function_single()
by a single call to smp_call_function_mask() (which is new for x86_64).

Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Laurent Vivier 2007-10-22 16:33:07 +02:00 committed by Avi Kivity
parent 83d87d1673
commit 49d3bd7e2b
1 changed files with 3 additions and 23 deletions
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26
drivers/kvm/kvm_main.c
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@ -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)