On Thu, Feb 20, 2020 at 4:44 AM Guillaume Gardet <Guillaume.Gardet@xxxxxxx> wrote: > > Hi, > > With (guest) kernel 5.5+ with qemu/kvm on arm64, I get lots of display corruptions leading to this kind of screen: > https://openqa.opensuse.org/tests/1174521#step/yast2_i/24 Looking at the screenshot, it seems cacheline-related? There was a change of memory type https://lists.freedesktop.org/archives/dri-devel/2019-August/233456.html While the guest memory type is ignored on Intel, it is honored on ARM. This attempt to fix it https://lists.freedesktop.org/archives/dri-devel/2019-December/248271.html does not seem to land. > > I git bisected it to commit c66df701e783bc666593e6e665f13670760883ee > ********** > drm/virtio: switch from ttm to gem shmem helpers > > virtio-gpu basically needs a sg_table for the bo, to tell the host where > the backing pages for the object are. So the gem shmem helpers are a > perfect fit. Some drm_gem_object_funcs need thin wrappers to update the > host state, but otherwise the helpers handle everything just fine. > > Once the fencing was sorted the switch was surprisingly easy and for the > most part just removing the ttm code. > > v4: fix drm_gem_object_funcs name. > > Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> > Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx> > Reviewed-by: Chia-I Wu <olvaffe@xxxxxxxxx> > Link: http://patchwork.freedesktop.org/patch/msgid/20190829103301.3539-15-kraxel@xxxxxxxxxx > ********** > > I also tested kernel 5.6-rc2 which has the same bug. > Without kvm, the display is fine. > > Regards, > Guillaume > _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
