linux-kernel - Re: [PATCH v3 2/9] kvm-vfio: Decouple only when we match a group

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Message-ID: <ca60f768-e48b-8b8a-50ea-922f819ed36a@redhat.com>
Date:   Wed, 28 Jun 2017 19:37:20 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Alex Williamson <alex.williamson@...hat.com>, kvm@...r.kernel.org
Cc:     Alexey Kardashevskiy <aik@...abs.ru>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, linux@...linux.org.uk,
        eric.auger@...hat.com
Subject: Re: [PATCH v3 2/9] kvm-vfio: Decouple only when we match a group



On 20/06/2017 17:47, 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@...hat.com>
> Reviewed-by: Alexey Kardashevskiy <aik@...abs.ru>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Eric Auger <eric.auger@...hat.com>
> Cc: stable@...r.kernel.org
> ---
>  virt/kvm/vfio.c |   13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
> index 37d9118fd84b..6e002d0f3191 100644
> --- a/virt/kvm/vfio.c
> +++ b/virt/kvm/vfio.c
> @@ -246,21 +246,20 @@ 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);
> +#ifdef CONFIG_SPAPR_TCE_IOMMU
> +			kvm_spapr_tce_release_vfio_group(dev->kvm,
> +							 kvg->vfio_group);
> +#endif
> +			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);
>  
> -#ifdef CONFIG_SPAPR_TCE_IOMMU
> -		kvm_spapr_tce_release_vfio_group(dev->kvm, vfio_group);
> -#endif
> -		kvm_vfio_group_set_kvm(vfio_group, NULL);
> -
>  		kvm_vfio_group_put_external_user(vfio_group);
>  
>  		kvm_vfio_update_coherency(dev);
> 
> 

Acked-by: Paolo Bonzini <pbonzini@...hat.com>

Thanks,

Paolo