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KVM: s390: Do not yield when target is already running
author
Christian Borntraeger
<borntraeger@de.ibm.com>
Fri, 15 Feb 2019 12:47:20 +0000
(13:47 +0100)
committer
Christian Borntraeger
<borntraeger@de.ibm.com>
Thu, 10 Oct 2019 11:18:40 +0000
(13:18 +0200)
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
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diff --git
a/arch/s390/kvm/diag.c
b/arch/s390/kvm/diag.c
index 609c55df3ce862be7a3884a90a27446a5e61d3f2..3fb54ec2cf3e1f0ea364bc6590a8c5059e35cec4 100644
(file)
--- 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;