diff options
| author | Greg Kurz <gkurz@linux.vnet.ibm.com> | 2016-05-09 19:11:54 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-05-11 23:37:53 +0300 |
| commit | 9b9e3fc4d5a31f6050508f2404369beac4356867 (patch) | |
| tree | cc2cf66306c5c256d8b3b30daaf2e40dfd866b9b /include/linux/kvm_host.h | |
| parent | bdb4094eb57aeab6683ea9c90d8b29271bf34405 (diff) | |
| download | linux-9b9e3fc4d5a31f6050508f2404369beac4356867.tar.xz | |
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 <dahi@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index ad40d44784c7..0a0e00d9c5da 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) |