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vfio/display: Fix missing update to set backing fields
The below referenced commit renames scanout_width/height to backing_width/height, but also promotes these fields in various portions of the egl interface. Meanwhile vfio dmabuf support has never used the previous scanout fields and is therefore missed in the update. This results in a black screen when transitioning from ramfb to dmabuf display when using Intel vGPU with these features. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1891 Link: https://lists.gnu.org/archive/html/qemu-devel/2023-08/msg02726.html Fixes: 9ac06df ("virtio-gpu-udmabuf: correct naming of QemuDmaBuf size properties") Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Tested-by: Cédric Le Goater <clg@redhat.com> Signed-off-by: Cédric Le Goater <clg@redhat.com> (cherry picked from commit 931150e) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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