From: Greg Kurz Date: Mon, 9 May 2016 16:11:54 +0000 (+0200) Subject: KVM: remove NULL return path for vcpu ids >= KVM_MAX_VCPUS X-Git-Tag: v4.14-rc1~3123^2~34 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9b9e3fc4d5a31f6050508f2404369beac4356867;p=platform%2Fkernel%2Flinux-rpi.git KVM: remove NULL return path for vcpu ids >= KVM_MAX_VCPUS Commit c896939f7cff ("KVM: use heuristic for fast VCPU lookup by id") added a return path that prevents vcpu ids to exceed KVM_MAX_VCPUS. This is a problem for powerpc where vcpu ids can grow up to 8*KVM_MAX_VCPUS. This patch simply reverses the logic so that we only try fast path if the vcpu id can be tried as an index in kvm->vcpus[]. The slow path is not affected by the change. Reviewed-by: David Hildenbrand Reviewed-by: Cornelia Huck Signed-off-by: Greg Kurz Signed-off-by: Paolo Bonzini --- diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ad40d44..0a0e00d 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -447,12 +447,13 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm *kvm, int i) static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id) { - struct kvm_vcpu *vcpu; + struct kvm_vcpu *vcpu = NULL; int i; - if (id < 0 || id >= KVM_MAX_VCPUS) + if (id < 0) return NULL; - vcpu = kvm_get_vcpu(kvm, id); + if (id < KVM_MAX_VCPUS) + vcpu = kvm_get_vcpu(kvm, id); if (vcpu && vcpu->vcpu_id == id) return vcpu; kvm_for_each_vcpu(i, vcpu, kvm)