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Re: [Xen-users] Help with VGA passthrough

On Wednesday 25 June 2014 08:45:07 Gordan Bobic wrote:


> In terms of device capture, reboot the machine and look at lspci -vvv. If

> anything other than pciback is the driver attached to your GPU, it isn't

> going to work. If the radeon driver touched the card it has been tainted

> and until the bus reset method is implemented it won't work. You will need

> to remove the radeon driver from your initrd, blacklist it in

> /etc/modprobe.d/, create a configuration file for xen-pciback in there to

> make it capture the PCI devices you will be passing through, and create a

> script in /etc/sysconfig/modules/ to modprobe xen-pciback and AFTER that

> modprobe radeon if your primary GPU also uses that driver.


I don't have to do any of this with my 5450. My machine has two 5450's and no other video cards so maybe that is why it works. I let my machine boot up as normal and then just use xl pci-assignable-add before I want to start a DomU with the video card as secondary passthrough.

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