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. _______________________________________________ vfio-users mailing list vfio-users@redhat.com https://www.redhat.com/mailman/listinfo/vfio-users
