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

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Message-ID: <cd9f85a5-0d99-4007-bba2-d792ac9d84da@gmail.com>
Date: Fri, 28 Feb 2025 16:21:58 -0500
From: Demi Marie Obenour <demiobenour@...il.com>
To: Honglei Huang <honglei1.huang@....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 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.
-- 
Sincerely,
Demi Marie Obenour (she/her/hers)