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Re: [Xen-users] Identifying graphics cards for passthrough

On 15/04/13 12:39, Peter Maloney wrote:
On 2013-04-15 13:09, Paul Stimpson wrote:
Hi Peter,
I am already passing other PCI devices through to the guest
successfully. Say for example 00:06:00.0.

How do I write this for the conf file please. I tried things like:

# 0 is secondary passthrough; 1 is primary passthrough
# without the 0000: (not sure if it is a problem though)
I tried this (I put the other card in /etc/modprobe.d/pciback.conf to
hide it) but Xen says the card is not assignable. When I run the
machine up, there is what looks like Linux boot logging on the second
monitor that stays there after the machine comes up.

I'm obviously doing something wrong but, right now, I'm not sure what
it is.
I'm not sure about using modprobe.d for this... modprobe would rely on
the device being unbound before it would work. The boot line method
works because nothing is bound before the boot. But modprobe would need
an unbind too, not just a list of devices.

What I use is this script I wrote (which is simple to use, because you
don't need to edit your boot lines, or rebuild your kernel):

As it says on the top of that page, xl has this functionality built in.
I wrote that for xm.

Thank you for all your help.

We are using xl. I had some major progress yesterday. I did the following:

* echo "0000:05:00.0" > /sys/bus/pci/devices/0000\:05\:00.0/driver/unbind
    * pci-assignable-add 05:00.0
    * pci-attach Windows-guest 05:00.0

The card then appeared in Windows. I had to access the VM via VNC as the AMD Catalyst driver has a wonderful feature that you can't install it unless the hardware is already in the machine and detected by the driver installer. It installed and, after a guest reboot, I got a lovely full-res Windows desktop on the right card's output.

My next challenge is to make it all work automatically. I tried adding "xen_pciback" to /etc/initramfs-tools/modules then doing an "update-initramfs -vu". After that I added "xen-pciback.passthrough=1 xen-pciback.hide=(0000:00:1a.0)(0000:00:1d.0)(0000:05:00.0)(0000:05:00.1)(0000:06:00.0)(0000:08:00.0)" to the end of GRUB_CMDLINE_XEN in /etc/default/grub and fired off an update-grub. I did this because a colleague said this should work. It didn't so I added the matching pciback hide to /etc/modprobe.d/pciback.conf just in case as pciback was still a module. This also didn't work.

I feel like I'm making progress as I at least have it working manually. Was my colleague correct that adding the module to initramfs works or should I blow the cobwebs out of my brain and try to remember how to roll a custom kernel please?


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