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SubjectRe: [PATCH 2/7] kvm-vfio: Decouple only when we match a group
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On 09/06/2017 23:59, Alex Williamson wrote:
> Unset-KVM and decrement-assignment only when we find the group in our
> list. Otherwise we can get out of sync if the user triggers this for
> groups that aren't currently on our list.
>
> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> ---
> virt/kvm/vfio.c | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
> index d32f239eb471..db9036ef8c73 100644
> --- a/virt/kvm/vfio.c
> +++ b/virt/kvm/vfio.c
> @@ -201,18 +201,16 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
> continue;
>
> list_del(&kvg->node);
> + kvm_arch_end_assignment(dev->kvm);
> + kvm_vfio_group_set_kvm(kvg->vfio_group, NULL);
> kvm_vfio_group_put_external_user(kvg->vfio_group);
> kfree(kvg);
> ret = 0;
> break;
> }
>
> - kvm_arch_end_assignment(dev->kvm);
> -
> mutex_unlock(&kv->lock);
>
> - kvm_vfio_group_set_kvm(vfio_group, NULL);
> -
> kvm_vfio_group_put_external_user(vfio_group);
>
> kvm_vfio_update_coherency(dev);
>

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

Should these two patches be applied to stable kernels too? In any case,
please take care your self of getting these to Linus!

Thanks,

Paolo

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