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

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

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.


On Mon, 2014-04-07 at 11:42 -0600, Shane Johnson wrote:
> Ian,
> Thank you for the info.  Believe me, I am not a coder unfortunately,
>  If I submitted a patch everyone would laugh and ask if I was in
> Kindergarten.
> If George does do it as passthrough, would that be like we can block
> them from the Dom0 and them use the xl like we do with pci-passthrough
> to attach them to the DomU?
>   I don't know how possible it is, but if there was one command that
> removed them from the Dom0 and then added to the DomU - having to
> reboot the host for blocking like with PCI makes it not worth the
> effort.  
> While I'm talking about effort on this, this isn't a high-priority, I
> just ran into a situation recently where it would have been nice to
> add a security dongle to a HVM DomU without having to reboot the
> beast.
> Thanks
> Shane
> On Mon, Apr 7, 2014 at 10:38 AM, Ian Campbell
> <Ian.Campbell@xxxxxxxxxx> wrote:
>         On Fri, 2014-04-04 at 13:50 -0600, Shane Johnson wrote:
>         > I have hunted and can't find anything except information for
>         last year
>         > stating that PVUSB isn't ready and has several major bugs.
>          Does
>         > anyone have any updated info on this or on how we can do a
>         USB hotplug
>         > to the DomU with the xl toolstack?
>         AFAIK nobody is working on either upstreaming the PV USB
>         drivers or on
>         the toolstack side of things.
>         George Dunlap (CCd) was planning to take another look at the
>         USB support
>         in libxl, but I think that was for passthrough of USB devices
>         to the
>         emulated USB controller of an HVM guest (but perhaps I am
>         misremembering?).
>         Assuming George isn't working on it then patches are always
>         welcome (and
>         if George is then you guys can argue among yourselves about
>         who gets to
>         do it ;-))
>         Ian.
> -- 
> Shane D. Johnson
> IT Administrator
> Rasmussen Equipment
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> http://lists.xen.org/xen-users

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