4:25 a.m.
Hi,
I'm trying to use USB pass through with devices that are not present at
the VM startup. However, when starting the machine, libvirt complains
that the USB device doesn't exist. I was following the guide at [1], but
this doesn't seem to work on Debian Wheezy.
Any hints how to achieve that?
Thanks,
Felicitus
[1]
http://david.wragg.org/blog/2009/03/usb-pass-through-with-libvirt-and-kvm...
7:12 a.m.
On Fri, Dec 07, 2012 at 11:25:49 +0100, Felicitus wrote:
Hi,
I'm trying to use USB pass through with devices that are not present at
the VM startup. However, when starting the machine, libvirt complains
that the USB device doesn't exist. I was following the guide at [1], but
this doesn't seem to work on Debian Wheezy.
Any hints how to achieve that?
With libvirt-1.0.0 or newer, you can use startupPolicy='optional' for that USB
device, as documented at http://www.libvirt.org/formatdomain.html#elementsUSB
However, such device would not be automatically connected when it becomes
available (which seems to be what you are after according to the guide you
posted). You'd need to shut the VM down and start it up again. It might be
possible to use USB redirection provided by SPICE
(http://www.libvirt.org/formatdomain.html#elementsRedir) for this but I'm not
sure about it, I've never used it.
Jirka
7:17 a.m.
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On 12/12/2012 02:12 PM, Jiri Denemark wrote:
With libvirt-1.0.0 or newer, you can use
startupPolicy='optional'
for that USB device, as documented at
http://www.libvirt.org/formatdomain.html#elementsUSB
However, such device would not be automatically connected when it
becomes available (which seems to be what you are after according
to the guide you posted). You'd need to shut the VM down and start
it up again.
That sounds almost as what I need - however, a VM shutdown and startup
again is not very handy.
Is there any chance to attach the device at runtime to the VM?
Our use case is this:
We've got a VM which has CUPS installed, and any USB printers attached
to the physical box need to be passed through to the VM. Printers are
turned off when not in use, and thus they need to be attached in an
automatic manner to the VM.
Regards
Felicitus
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7:30 a.m.
On Wed, Dec 12, 2012 at 14:17:38 +0100, Felicitus wrote:
On 12/12/2012 02:12 PM, Jiri Denemark wrote:
> However, such device would not be automatically connected when it
> becomes available (which seems to be what you are after according
> to the guide you posted). You'd need to shut the VM down and start
> it up again.
That sounds almost as what I need - however, a VM shutdown and startup
again is not very handy.
Is there any chance to attach the device at runtime to the VM?
Yeah, with USB redirection, which I mentioned in the part of my email you did
not quote :-) However, I'm not sure if it's possible to make it happen
automatically or if you need to manually attach each device.
Jirka
8:36 a.m.
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Yeah, with USB redirection, which I mentioned in the part of my
email you did not quote :-) However, I'm not sure if it's possible
to make it happen automatically or if you need to manually attach
each device.
I will try it out - but right now, I'm stuck with 0.9.x on Debian Wheezy.
Now as you mention spice USB - are you sure that that's the only way?
Because if I add a USB device in virt-manager, it appears immediately
in the VM.
Another idea would probably be to use USP/IP [1] which is already
present as module on my Debian Wheezy installations.
Regards,
Felicitus
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