Re: [Xen-users] Trouble getting vga passthrough on Xen 4.4 on Debian Wheezy working

[Casey DeLorme <cdelorme@xxxxxxxxx>]

Hello Alex,

You can blacklist modules to prevent devices from being used by creating or adding to `/etc/modprobe.d/blacklist.conf`. ÂA blacklist line might look like `blacklist radeon`. ÂI believe you can check the driver/module name with `lspci -k`.

You might also consider adding the [BusID to your xorg](http://www.x.org/archive/X11R7.5/doc/man/man5/xorg.conf.5.html).

Ideally your kernel should be built with [XEN_PCIDEV_BACKEND](http://wiki.xen.org/wiki/Mainline_Linux_Kernel_Configs) for pciback at boot time, which would allow you to hide your devices from the system when it boots by adding them to your grub.cfg. ÂIf you use the module version it won't execute until after the system boots, by which point the driver generally has already loaded.

There might be other ways of going about this that I am unaware of.

Best of luck,

Casey

On Fri, Sep 27, 2013 at 2:13 PM, Alex <alex413x@xxxxxxxxx> wrote:

This might be more of a Debian question, but here goes:

I've compiled Xen 4.4 from the git master successfully, and it seems everything is working right. However, when I boot up my system it seems like Debian is loading my radeon 5450 (the card I want to passthrough to my guest os - this is a pci x1 card!) *before* my nvidia gforce 9600 (a pci x16 card)!

Of course, I want my Dom0 to be using the nvidia by default and leaving the Radeon available for a guest Windows 7 system. How can a specify that one card is used over the other on boot?

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