Re: [Xen-users] VT-d passthrough strangeness

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 05/02/2013 01:31 AM, Tony Lill wrote:

> > > > > In order to successfully pass through a USB controller to a
> > > > > linux PVM, I also had to add 'xen-pciback.permissive
> > > > > pci=resource_alignment=00:13.2' to the dom0 linux command
> > > > > line, though you can do this through /sys as well.
> > > > Any particular reason why specifically 00:13.2 in
> > > > pci=resource_alignment=00:13.2? And what exactly does it do?
> > > Sorry, replace 00:13.2 with  the pci id of your usb controller
> > But why is pci=resource_alignment important specifically for the
> > host USB controller passthrough?
> I've given up asking 'why' when it comes to xen. Just keep poking
> around different hypervisors, kernels, options, etc. until you find
> some combination that works, and don't expect to work on a different
> machine or survive an upgrade.
That's not exactly a glowing endorsement of what is supposed to be an 
enterprise grade product...
Gordan

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