And done.
I just changed the machine type to the Q35 most recent available for me:
pc-q35-2.8
The default PCIE layout worked. Up and running with Wayland on the R9
290.
Thank you Alex! I hope someone else gets to enjoy a similar setup too!
On 24 Oct 2016, at 10:43, Alex Williamson wrote:
On Mon, 24 Oct 2016 10:38:08 -0700
globalgorri...@fastmail.fm wrote:
On 24 Oct 2016, at 10:23, Alex Williamson wrote:
On Mon, 24 Oct 2016 10:20:08 -0700
globalgorri...@fastmail.fm wrote:
Hi,
Pass-through works fine with the the same linux 4.8 VM and nouveau
and a
Quadro K2200.
Passing-through both a R7 260X and and a R9 290 I get the same
kernel
oops:
IP: [<ffffffffc029efd9>] drm_pcie_get_speed_cap_mask+0x39/0xf0
[drm]
More here:
http://pastebin.com/Waysyk2e
Both the AMD cards work fine if I pass them through to a Windows
VM.
I'm supposing this might likely be then an issue with Radeon.
However the oops makes me think perhaps it's breaking on unexpected
PCIE
information?
Is it possible there some missing information in that radeon is
looking
for that's missing? What PCIE information is passed through by vfio
(lspci from both host and vm also in the pastebin)?
Anybody using radeon with passthrough AMD cards and seen this?
Radeon with a Linux guest is actually one of the few cases where you
need to be running a Q35 machine with the GPU placed behind a PCIe
downstream/root port. The code blindly assumes that an upstream
PCIe
bridge is present and tries to poke registers on it.
Bingo.
I'll have to clone and try with that.
Alex, do you know if is enough to just simply passthrough the device
but
with Q35? Or is a custom topology needed?
I would recommend a PCIe root port with the Radeon on the bus created
by that. The Linux driver assumes this sort of topology.
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