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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-02-15 13:47:20 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2019-10-10 13:18:40 +0200 |
| commit | c7b7de63124645089ccf9900b9e5ea08059ccae0 (patch) | |
| tree | d723a20a594c6f525c56c0988363bddf724cd500 | |
| parent | KVM: s390: count invalid yields (diff) | |
| download | linux-c7b7de63124645089ccf9900b9e5ea08059ccae0.tar.xz linux-c7b7de63124645089ccf9900b9e5ea08059ccae0.zip | |
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>
| -rw-r--r-- | arch/s390/kvm/diag.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/kvm/diag.c b/arch/s390/kvm/diag.c index 609c55df3ce8..3fb54ec2cf3e 100644 --- a/arch/s390/kvm/diag.c +++ b/arch/s390/kvm/diag.c @@ -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; |