diff mbox series

[GIT,PULL,5/5] KVM: s390: Do not yield when target is already running

Message ID 20191118083602.15835-6-borntraeger@de.ibm.com (mailing list archive)
State New, archived
Headers show
Series [GIT,PULL,1/5] KVM: s390: Remove unused parameter from __inject_sigp_restart() | expand

Commit Message

Christian Borntraeger Nov. 18, 2019, 8:36 a.m. UTC 
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>
---
 arch/s390/kvm/diag.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

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;