[vfio-users] Not binding GPU to vfio-pci

[Nick Sarnie]

Sorry, I'm not sure if I'm using legacy device assignment. My script is
stop xdm, echo "0000:01:00.0" > /sys/bus/pci/drivers/radeon/unbind echo
"0000:01:00.1" > /sys/bus/pci/drivers/radeon/unbind and then start xdm. I
use virt-manager with libvirt, and I added the gpu to the VM with PCI Host
Device under Add Hardware. Is this what you're talking about?


Thanks,
sarnex

On Sat, Feb 20, 2016 at 7:24 PM, Alex Williamson <alex.williamson at redhat.com
> wrote:

> On Sat, 20 Feb 2016 18:47:29 -0500
> Nick Sarnie <commendsarnex at gmail.com> wrote:
>
> > Hi guys,
> > When i want to do gpu-passthrough, i just unbind my GPU from radeon, and
> > then pass it to qemu. I don't bind it to vfio-pci or any driver and it
> > works fine. Is there any downside or performance loss to doing it this
> way?
>
> Does this mean you're using the pci-assign driver with qemu?  If so, be
> advised that legacy KVM device assignment is deprecated upstream, so it
> will likely go away at some point and it mostly unsupported already.
> Generally it's advised to avoid host drivers because they don't like
> releasing devices and things like Xorg get unhappy as well.  If you
> have a usage model that allows you to release the device, go for it,
> but you probably want to migrate away from legacy KVM device
> assignment.
>
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