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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2015-04-16 16:58:22 +0200 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2015-05-08 15:51:12 +0200 |
| commit | 785dbef407d8b3c82348aba2689e493c752c62ec (patch) | |
| tree | 230adb5cebc7fb963f7df9b90f89bb3486467f0c /arch/s390/kvm | |
| parent | KVM: s390: fix external call injection without sigp interpretation (diff) | |
| download | linux-dev-785dbef407d8b3c82348aba2689e493c752c62ec.tar.xz linux-dev-785dbef407d8b3c82348aba2689e493c752c62ec.zip | |
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>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 8cd8e7b288c5..f5282e62f87f 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -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); /* |