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KVM: remove NULL return path for vcpu ids >= KVM_MAX_VCPUS

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Commit c896939f7c ("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>
This commit is contained in:
Greg Kurz 2016-05-09 18:11:54 +02:00 committed by Paolo Bonzini
parent bdb4094eb5
commit 9b9e3fc4d5
1 changed files with 4 additions and 3 deletions
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7
include/linux/kvm_host.h
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@ -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)