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

[Huang, Honglei1]

On 2025/3/1 5:21, Demi Marie Obenour wrote:
> 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.

Yes, I totally agree userptr can accelerate shm buffers, but I currently
don't know if there are any other projects working on similar features,
or if maintainers have any opinions or better ways to implement them, so
I temporarily limit this feature to HSAKMT context only.

I am waiting for everyone's opinions, please provide your thoughts.

Regards,
Honglei