This patches can be applied only on kvm-updates-2.6.24 and kvm-updates-2.6.25
as it needs smp_call_function_mask().
In kvm_flush_remote_tlbs(), it replaces a loop using smp_call_function_single()
by a single call to smp_call_function_mask().
Signed-off-by: Laurent Vivier <[EMAIL PROTECTED]>
---
drivers/kvm/kvm_main.c | 26 +++-----------------------
1 files changed, 3 insertions(+), 23 deletions(-)
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index bf6a86c..6f7b31e 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -200,21 +200,15 @@ 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)
@@ -223,23 +217,9 @@ 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)
--
1.5.2.4
-------------------------------------------------------------------------
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