From: Hannes Reinecke <hare@suse.de>
To: virtualization@lists.linux-foundation.org
Subject: Re: Question about eliminating virtio-scsi 30s timeout and hot-unplug
Date: Wed, 10 Jan 2018 20:39:19 +0100 [thread overview]
Message-ID: <c54b7d64-958d-eb22-8542-918c5b8922e6@suse.de> (raw)
In-Reply-To: <CAMmhGq+9qZhJRdaeXZtdu6AyJUPBKkbL4F2=NeXhvjUbxEoyow@mail.gmail.com>
On 12/21/2017 08:29 PM, Jason Behmer via Virtualization wrote:
> Hi Paolo,
> I had a question about this patch that eliminates virtio-scsi timeout on
> IOs - https://patchwork.kernel.org/patch/9802047/. How does this work
> when we have IOs outstanding to a device that is then hot-unplugged.
> I'm under the impression that those IOs will never get returned with any
> status (please correct me if I'm wrong), and we will then end up waiting
> on them forever with this patch.
>
It's no different from the virtio-block path; the I/O is pending in the
qemu process. When a device is hot-unplugged the I/O will be returned to
the qemu process, which then will return the final status to the guest.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
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prev parent reply other threads:[~2018-01-10 19:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-21 19:29 Question about eliminating virtio-scsi 30s timeout and hot-unplug Jason Behmer via Virtualization
2018-01-10 19:39 ` Hannes Reinecke [this message]
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