KVM: s390: optimize round trip time in request handling
The fast path for a sie exit is that no kvm reqest is pending.
Make an early check to skip all single bit checks.
Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 8cd8e7b..f5282e6 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -1720,6 +1720,8 @@
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{
+ if (!vcpu->requests)
+ return 0;
retry:
s390_vcpu_unblock(vcpu);
/*