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KVM: X86: trigger kvmclock sync request just once on VM creation 

In the progress of vCPUs creation, it queues a kvmclock sync worker to the global
workqueue before each vCPU creation completes. The workqueue subsystem guarantees
not to queue the already queued work; however, we can make the logic more clear by
making just one leader to trigger this kvmclock sync request, and also save on
cacheline bouncing caused by test_and_set_bit.

Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Wanpeng Li 2020-02-28 11:18:41 +08:00 committed by Paolo Bonzini
parent 4abaffce4d
commit b34de572a8
1 changed files with 3 additions and 5 deletions
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8
arch/x86/kvm/x86.c
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@ -9335,11 +9335,9 @@ void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
mutex_unlock(&vcpu->mutex);
if (!kvmclock_periodic_sync)
return;
schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
KVMCLOCK_SYNC_PERIOD);
if (kvmclock_periodic_sync && vcpu->vcpu_idx == 0)
schedule_delayed_work(&kvm->arch.kvmclock_sync_work,
KVMCLOCK_SYNC_PERIOD);
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)