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

[Tony Lill <ajlill@xxxxxxxxxxxxxxxxxxx>]

On 05/01/2013 05:41 PM, Gordan Bobic wrote:
>> On 05/01/2013 11:34 AM, Gordan Bobic wrote:
>>> On Wed, 01 May 2013 10:32:55 -0400, Tony Lill 
>>> <ajlill@xxxxxxxxxxxxxxxxxxx> wrote:
>>>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
>>>> 
>>>> 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.

In this case I got an error message, googled it, it said use that
option, and it fixed it. If it doesn't, rinse and repeat.

-- 
Tony Lill, OCT,                    Tony.Lill@xxxxxxxxxxxxxxxxxxx
President, A. J. Lill Consultants                 (519) 650 0660
539 Grand Valley Dr., Cambridge, Ont. N3H 2S2     (519) 241 2461
--------------- http://www.ajlc.waterloo.on.ca/ ----------------



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