virtio-gpu: add shared resource feature

This patch adds a new virtio feature for shared resources.

Shared resources are allocated by the guest from normal ram, like
traditional resources.  They can be used by the guest almost like
traditional resources, the only exception is that shared resources can
only be used with backing storage attached (the linux driver does that
anyway so the workflow doesn't change).  The host can map these
resources and use them directly (using udmabuf), so any guest changes to
these resources can be visible on the host without explicit transfer
request.  Transfer requests are still needed though as the host might
still have syncronize the resource, for example in case importing the
udmabuf failed for some reason.

guest/host interface: Two new commands are added to create 2D and 3D
shared resources.  They work exactly like the non-shared counterparts.

qemu patches:
  https://git.kraxel.org/cgit/qemu/log/?h=sirius/virtio-gpu-feature-shared

linux patches:
  https://git.kraxel.org/cgit/linux/log/?h=drm-virtio-feature-shared

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

0 files changed, 0 insertions, 0 deletions