Commit 785dbef4 authored Apr 16, 2015 by Christian Borntraeger

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>

parent b938eace

arch/s390/kvm/kvm-s390.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1720,6 +1720,8 @@ static bool ibs_enabled(struct kvm_vcpu *vcpu)

		static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
		{
		if (!vcpu->requests)
		return 0;
		retry:
		s390_vcpu_unblock(vcpu);
		/*