Re: [PATCH v1 1/7] virtio-gpu api: add blob userptr resource

[Demi Marie Obenour]

On 2/28/25 12:36 AM, Honglei Huang wrote:
> From: Honglei Huang <Honglei1.Huang@xxxxxxx>
> 
> Add a new resource for blob resource, called userptr, used for let
> host access guest user space memory, to acquire buffer based userptr
> feature in virtio GPU.
> 
> - The capset VIRTIO_GPU_CAPSET_HSAKMT used for context init,
> in this series patches only HSAKMT context can use the userptr
> feature. HSAKMT is a GPU compute library in HSA stack, like
> the role libdrm in mesa stack.

Userptr should not be limited to HSMKMT contexts.  Userptr can
accelerate shm buffers by avoiding a copy from guest to host, and
it can be implemented using grant tables on Xen.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)