Re: [PATCH 0/5 V5] vhost-scsi: IO error fixups

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Mon, Nov 09, 2020 at 11:33:18PM -0600, Mike Christie wrote:
> The following patches were made over Michael's vhost branch:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git/log/?h=vhost
> 
> They fixe a couple issues where the guest is getting IO errors:
> 1. The admin may set num_queues and cmd_per_lun/virtqueue_size
> in a way that allows the guest to send more IO that vhost-scsi
> was coded for.
> 
> 2. A race where vhost-scsi completes the cmd to the guest before
> it's fully completed in the target/vhost-scsi layers so if the
> guest sends a new IO too quicky we fail it.
> 
> 3. If the real/physical storage (lio backend device) hits a transient
> error then vhost-scsi would fail commands instead of relying on
> the lower levels error recovery to do what the admin had set up.
> 
> V5:
> - Bring back V1 but move flush patches to a separate clean up set
> - Modify test in vhost_vq_is_setup
> 
> V4:
> - really really fix compile errors
> - dropped threading patches so we can figure that out separately.
> 
> V3:
> - fix compile errors
> - fix possible crash where cmd could be freed while adding it to
> completion list
> - fix issue where we added the worker thread to the blk cgroup but
> the blk IO was submitted by a driver workqueue.
> 
> V2:
> - fix use before set cpu var errors
> - drop vhost_vq_is_setup
> - include patches to do a worker thread per scsi IO vq
> 
> 

Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

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