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Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?
From: |
Kevin Wolf |
Subject: |
Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread? |
Date: |
Wed, 17 Jun 2015 10:35:39 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Am 16.06.2015 um 17:34 hat Stefan Hajnoczi geschrieben:
> On Tue, Jun 16, 2015 at 3:44 PM, Peter Lieven <address@hidden> wrote:
> > I wonder how difficult it would be to have the IDE CDROM run in its own
> > thread?
> > We usually have ISOs mounted on an NFS share as CDROM. Problem: If the NFS
> > Share
> > goes down, it takes down monitor, qmp, vnc etc. with it.
> >
> > Maybe its already possible to do this via cmdline args?
> >
> > Any ideas, comments?
>
> If QEMU hangs in the read/write/flush/discard code path due to NFS
> downtime it is a bug.
>
> QEMU is expected to hang in open/reopen because those are performed in
> a blocking fashion.
>
> Which of these cases applies to what you are seeing? Maybe it can be fixed.
Don't forget bdrv_drain_all(), which is called a lot by the monitor. So
no matter what you do (and this includes moving to a thread as in a
hypothetical "ATAPI dataplane"), you end up with a hang sooner or later.
Kevin
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Stefan Hajnoczi, 2015/06/16
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?,
Kevin Wolf <=
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Paolo Bonzini, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Kevin Wolf, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Kevin Wolf, 2015/06/18
- Re: [Qemu-devel] [Qemu-block] RFC cdrom in own thread?, Peter Lieven, 2015/06/18