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Subject: Re: [PATCH v3 0/8] vhost: Reset batched descriptors on SET_VRING_BASE
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To:     =?UTF-8?Q?Eugenio_P=c3=a9rez?= <eperezma@redhat.com>,
        "Michael S. Tsirkin" <mst@redhat.com>
Cc:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        kvm list <kvm@vger.kernel.org>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        "virtualization@lists.linux-foundation.org" 
        <virtualization@lists.linux-foundation.org>,
        Halil Pasic <pasic@linux.ibm.com>,
        Cornelia Huck <cohuck@redhat.com>
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Date:   Wed, 1 Apr 2020 09:19:09 +0200
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On 31.03.20 21:27, Eugenio Pérez wrote:
> Vhost did not reset properly the batched descriptors on SET_VRING_BASE
> event. Because of that, is possible to return an invalid descriptor to
> the guest.
> 
> This series ammend this, resetting them every time backend changes, and
> creates a test to assert correct behavior. To do that, they need to
> expose a new function in virtio_ring, virtqueue_reset_free_head, only
> on test code.
> 
> Another useful thing would be to check if mutex is properly get in
> vq private_data accessors. Not sure if mutex debug code allow that,
> similar to C++ unique lock::owns_lock. Not acquiring in the function
> because caller code holds the mutex in order to perform more actions.


> 
> v3:
> * Rename accesors functions.
> * Make scsi and test use the accesors too.
> 
> v2:
> * Squashed commits.
> * Create vq private_data accesors (mst).
> 
> This is meant to be applied on top of
> c4f1c41a6094582903c75c0dcfacb453c959d457 in
> git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git.


A quick test on s390 looks good.