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

  • To: xen-users@xxxxxxxxxxxxx
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Thu, 02 May 2013 08:15:27 +0100
  • Delivery-date: Thu, 02 May 2013 07:16:44 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

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...


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