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KVM: Wake up waitqueue before calling get_cpu()

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This moves the get_cpu() call down to be called after we wake up the
waiters. Therefore the waitqueue locks can safely be rt mutex.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Sven-Thorsten Dietrich <sven@thebigcorporation.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Blunck 2009-04-07 23:58:56 +00:00 committed by Avi Kivity
parent 14d0bc1f7c
commit 9b62e5b10f
1 changed files with 2 additions and 1 deletions
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3
arch/x86/kvm/x86.c
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@ -4569,7 +4569,7 @@ static void vcpu_kick_intr(void *info)
void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
{
int ipi_pcpu = vcpu->cpu;
int cpu = get_cpu();
int cpu;
if (waitqueue_active(&vcpu->wq)) {
wake_up_interruptible(&vcpu->wq);
@ -4579,6 +4579,7 @@ void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
* We may be called synchronously with irqs disabled in guest mode,
* So need not to call smp_call_function_single() in that case.
*/
cpu = get_cpu();
if (vcpu->guest_mode && vcpu->cpu != cpu)
smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
put_cpu();