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Re: [PATCH 07/10] vhost, vhost-scsi: flush IO vqs then send TMF rsp


From: Stefan Hajnoczi
Subject: Re: [PATCH 07/10] vhost, vhost-scsi: flush IO vqs then send TMF rsp
Date: Tue, 17 Nov 2020 16:05:32 +0000

On Thu, Nov 12, 2020 at 05:19:07PM -0600, Mike Christie wrote:
> With one worker we will always send the scsi cmd responses then send the
> TMF rsp, because LIO will always complete the scsi cmds first which
> calls vhost_scsi_release_cmd to add them to the work queue.
> 
> When the next patch adds multiple worker support, the worker threads
> could still be sending their responses when the tmf's work is run.
> So this patch has vhost-scsi flush the IO vqs on other worker threads
> before we send the tmf response.
> 
> Signed-off-by: Mike Christie <michael.christie@oracle.com>
> ---
>  drivers/vhost/scsi.c  | 16 ++++++++++++++--
>  drivers/vhost/vhost.c |  6 ++++++
>  drivers/vhost/vhost.h |  1 +
>  3 files changed, 21 insertions(+), 2 deletions(-)

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

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