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KVM: s390: optimize round trip time in request handling

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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>
This commit is contained in:
Christian Borntraeger 2015-04-16 16:58:22 +02:00
parent b938eacea0
commit 785dbef407
1 changed files with 2 additions and 0 deletions
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arch/s390/kvm/kvm-s390.c
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@ -1720,6 +1720,8 @@ static bool ibs_enabled(struct kvm_vcpu *vcpu)
static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu) static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
{ {
if (!vcpu->requests)
return 0;
retry: retry:
s390_vcpu_unblock(vcpu); s390_vcpu_unblock(vcpu);
/* /*