From: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>Reviewed-by: Chegu Vinod <chegu_vinod@xxxxxx>
This helps in filtering out the eligible candidates further and
thus potentially helps in quickly allowing preempted lockholders to run.
Note that if a vcpu was spinning during preemption we filter them
by checking whether they are preempted due to pause loop exit.
Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>
---
virt/kvm/kvm_main.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 83a804c..60114e1 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1790,6 +1790,8 @@ void kvm_vcpu_on_spin(struct kvm_vcpu *me)
continue;
} else if (pass && i > last_boosted_vcpu)
break;
+ if (!ACCESS_ONCE(vcpu->preempted))
+ continue;
if (vcpu == me)
continue;
if (waitqueue_active(&vcpu->wq))
.