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From: Stefan Hajnoczi <stefanha@redhat.com>
To: Mike Christie <michael.christie@oracle.com>
Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org,
	mst@redhat.com, jasowang@redhat.com, pbonzini@redhat.com,
	virtualization@lists.linux-foundation.org
Subject: Re: [PATCH 0/5 V5] vhost-scsi: IO error fixups
Date: Thu, 12 Nov 2020 17:00:08 +0000
Message-ID: <20201112170008.GB1555653@stefanha-x1.localdomain> (raw)
In-Reply-To: <1604986403-4931-1-git-send-email-michael.christie@oracle.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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      parent reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-10  5:33 Mike Christie
2020-11-10  5:33 ` [PATCH 1/5] vhost: add helper to check if a vq has been setup Mike Christie
2020-11-10  7:20   ` Jason Wang
2020-11-10  5:33 ` [PATCH 2/5] vhost scsi: alloc cmds per vq instead of session Mike Christie
2020-11-12 17:11   ` Maurizio Lombardi
2020-11-10  5:33 ` [PATCH 3/5] vhost scsi: fix cmd completion race Mike Christie
2020-11-10  5:33 ` [PATCH 4/5] vhost scsi: add lun parser helper Mike Christie
2020-11-10  5:33 ` [PATCH 5/5] vhost scsi: Add support for LUN resets Mike Christie
2020-11-12 17:00 ` Stefan Hajnoczi [this message]

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