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KVM: s390: Do not yield when target is already running 

If the target is already running we do not need to yield.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
This commit is contained in:
Christian Borntraeger 2019-02-15 13:47:20 +01:00
parent 8474e5cac0
commit c7b7de6312
1 changed files with 4 additions and 0 deletions
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4
arch/s390/kvm/diag.c
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@ -168,6 +168,10 @@ static int __diag_time_slice_end_directed(struct kvm_vcpu *vcpu)
if (!tcpu)
goto no_yield;
/* target already running */
if (READ_ONCE(tcpu->cpu) >= 0)
goto no_yield;
if (kvm_vcpu_yield_to(tcpu) <= 0)
goto no_yield;