Re: [PATCH v4 1/2] KVM: remove NULL return path for vcpu ids >= KVM_MAX_VCPUS

Cornelia Huck
2016-04-26T07:44:58Z

On Thu, 21 Apr 2016 16:15:05 +0200
Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:

> 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.
>
> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
> ---
> include/linux/kvm_host.h | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>