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

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Message-ID: <c2d1334f-6f5a-493f-bbf0-3e92789f128a@amd.com>
Date: Thu, 6 Mar 2025 18:51:47 +0800
From: "Huang, Honglei1" <Honglei1.Huang@....com>
To: Demi Marie Obenour <demiobenour@...il.com>,
 David Airlie <airlied@...hat.com>, Gerd Hoffmann <kraxel@...hat.com>,
 Gurchetan Singh <gurchetansingh@...omium.org>, Chia-I Wu
 <olvaffe@...il.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 Simona Vetter <simona@...ll.ch>, Rob Clark <robdclark@...il.com>,
 Huang Rui <ray.huang@....com>
Cc: dri-devel@...ts.freedesktop.org, virtualization@...ts.linux.dev,
 linux-kernel@...r.kernel.org, Dmitry Osipenko <dmitry.osipenko@...labora.com>
Subject: Re: [PATCH v1 1/7] virtio-gpu api: add blob userptr resource


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@....com>
>>
>> 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