[0/3] virtgpu: check if P2P is possiable or not

Message

Julia Zhang Dec. 7, 2024, 10:50 a.m. UTC

To implement dGPU prime feature, virtgpu needs to import/export buffer
between virtio iGPU and passthrough dGPU. Before that, virtgpu should
check if P2P is possible or not. But calling function pci_p2pdma_distance
in guest VM will only get virtual p2pdma_distance instead of real physical
p2pdma_distance.
 
So this series introduce an implementation of virtgpu device_attach
callback to get p2pdma_distance. And also adds a new virtgpu command to
pass PCI notations from guest to host and a new xen privcmd to get physical
p2pdma_distance according to the PCI notations in host.

Julia Zhang (3):
  xen:get p2pdma_distance
  virtgpu: get p2pdma_distance
  drm/virtio: Implement device_attach

 drivers/gpu/drm/virtio/virtgpu_drv.h   | 17 ++++++++
 drivers/gpu/drm/virtio/virtgpu_prime.c | 59 +++++++++++++++++++++++++-
 drivers/gpu/drm/virtio/virtgpu_vq.c    | 53 +++++++++++++++++++++++
 drivers/xen/privcmd.c                  | 42 ++++++++++++++++++
 include/uapi/linux/virtio_gpu.h        | 19 +++++++++
 include/uapi/xen/privcmd.h             | 12 ++++++
 6 files changed, 201 insertions(+), 1 deletion(-)