Re: [Xen-users] Help with VGA passthrough

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 06/26/2014 12:04 AM, Brian Menges wrote:
> I’ve read through these, however I’m on xenserver 6.2 and would rather
> not hack the ramdisk because any future update would obliterate that
> (most likely).
Not if you modify the dracut scripts to do the right ting. AFAIK 
XenServer is based on EL.
> Per gordon’s request, I’ve reset my system back to factory and here are
> the lspci/dmesg/xl dmesg.
>
> I can confirm that I do not load any radeon or radeon related drivers in
> dom0, however I cannot seem to hide the pci bus for it. Are the modules
> missing for XenServer 6.2 (xen 4.1.5) ?
Not loading the radeon driver is good. The PCI bus should not be hidden, 
the device you are passing through should just be owned by the 
xen-pciback driver (which the xl command for making the device 
assignable will do for you if you aren't pre-loading xen-pciback with 
appropriate options.
> The citrix support guide says nothing about hiding the device at all
> (which I tried the extboot.conf stuff to hide the pci devices to no avail).
You _shouldn't_ be doing this anyway. All you can do is detach the 
device to make it disappear, but then you won't be able to pass it through.
> If there’s a way to confirm xen-pcihide or whichever it is (many
> articles .. two names, not sure which is right) as loaded on xenserver
> 6.2 that’d be appreciated.
lsmod | grep pciback

> I have in blacklist.conf:
>
> blacklist radeon
>
> blacklist fglrx
>
> We shouldn’t ever touch those two modules… so I should be good for
> passthrough right?
Yes.

Gordan

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