Re: [Xen-users] Status of USB in xl toolstack

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 04/08/2014 10:14 AM, Ian Campbell wrote:
> On Tue, 2014-04-08 at 10:11 +0100, George Dunlap wrote:
> > On 04/08/2014 09:31 AM, Ian Campbell wrote:
> > > I don't know what George plans and you've dropped the CC so he is
> > > unlikely to see the question. I've put it back and left the quotes
> > > untrimmed.
> > >
> > > I don't believe you need to reboot the host to use PCI passthrough, in
> > > most cases you can dynamically rebind. There are helpers in xl to do
> > > this, or you can poke at sysfs directly.
> > >
> > > I think it would be unlikely that rebooting the host would be necessary
> > > for USB passthrough.
> > So there are several ways to get your USB device to your guest:
> > 1. PCI pass-through of the host USB controller
> > 2. passing through a host USB device via qemu emulation
> > 3. passing through a host USB device via PVUSB
> >
> > #1 is available and pretty well understood.  It has never required
> > booting your host -- you could always dynamically assign a device to
> > pciback after you've booted.  Before 4.2 this required a bunch of manual
> > frobbing about in sysfs; since 4.2 there are some convenient xl commands
> > to do so.  See the wiki page here:
> >
> > http://wiki.xenproject.org/wiki/Xen_PCI_Passthrough
> >
> > In #2, qemu emulates the USB controller, but passes the USB commands
> > through to the host device.  This has been available as a static
> > configuration for a long time; as of at least 4.3 you could pass in
> > arbitrary numbers of devices.  Depending on your USB device, if you do
> > #2 you may need to set the "usbversion" in your config file as well.
> >
> > There is no way to do USB "hot-plug" for this mode yet -- I have a patch
> > series that's functional, but still needs to be tweaked to get the
> > interface right.
> >
> > In #3, usbback passes the USB commands through to the host device.  This
> > requires pcifront in your guest and pciback in your domU and dom0
> ITYM usbfront and usbback here.
Indeed I do...

 -George


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