[Qemu-devel] [Bug 1827772] [NEW] [RFC] dma buf: support sprite plane

[Chen Zhang]

Public bug reported:

QEMU does not support sprite/overlay in DMA-buf mode for Intel gvt
vGPUs. Some use cases relies on sprite plane support, e.g. hw
accelerated video playback in Windows 10 guest.

To support this feature, functions in both kernel and QEMU should be
implemented:

- query support for plane info in kernel: 
  in vgpu_get_plane_info() of drm/i915/gvt/dmabuf.c, calls to 
intel_vgpu_decode_sprite_plane() shall be made;

- struct to hold VFIODMABuf object in QEMU:
  in struct VFIODisplay of include/hw/vfio/vfio-common.h;
- copying of data in QEMU:
  in vfio_display_get_dmabuf() of hw/vfio/display.c;
- drawing of sprite plane in QEMU:
  in vfio_display_dmabuf_update() of hw/vfio/display.c;

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: gvt mdev rfc vfio

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https://bugs.launchpad.net/bugs/1827772

Title:
  [RFC] dma buf: support sprite plane

Status in QEMU:
  New

Bug description:
  QEMU does not support sprite/overlay in DMA-buf mode for Intel gvt
  vGPUs. Some use cases relies on sprite plane support, e.g. hw
  accelerated video playback in Windows 10 guest.

  To support this feature, functions in both kernel and QEMU should be
  implemented:

  - query support for plane info in kernel: 
    in vgpu_get_plane_info() of drm/i915/gvt/dmabuf.c, calls to 
intel_vgpu_decode_sprite_plane() shall be made;

  - struct to hold VFIODMABuf object in QEMU:
    in struct VFIODisplay of include/hw/vfio/vfio-common.h;
  - copying of data in QEMU:
    in vfio_display_get_dmabuf() of hw/vfio/display.c;
  - drawing of sprite plane in QEMU:
    in vfio_display_dmabuf_update() of hw/vfio/display.c;

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