From: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx> Usually, VCPU ids match the array index. So let's try a fast lookup first before falling back to the slow iteration. Suggested-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> Reviewed-by: Dominik Dingel <dingel@xxxxxxxxxxxxxxxxxx> Reviewed-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> Signed-off-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx> Signed-off-by: Christian Borntraeger <borntraeger@xxxxxxxxxx> --- include/linux/kvm_host.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index b9f345f..7821137 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -465,6 +465,11 @@ static inline struct kvm_vcpu *kvm_lookup_vcpu(struct kvm *kvm, int id) struct kvm_vcpu *vcpu; int i; + if (id < 0 || id >= KVM_MAX_VCPUS) + return NULL; + vcpu = kvm_get_vcpu(kvm, id); + if (vcpu && vcpu->vcpu_id == id) + return vcpu; kvm_for_each_vcpu(i, vcpu, kvm) if (vcpu->vcpu_id == id) return vcpu; -- 2.3.0 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
