linux-kernel - Re: [PATCH v2 0/7] Add virtio gpu userptr support

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Message-ID: <a8636797-061c-4799-8017-1fee51228e8c@amd.com>
Date: Wed, 2 Apr 2025 09:47:40 +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 v2 0/7] Add virtio gpu userptr support

On 2025/3/30 3:56, Demi Marie Obenour wrote:
> On 3/21/25 4:00 AM, Honglei Huang wrote:
>> From: Honglei Huang <Honglei1.Huang@....com>
>>
>> Hello,
>>
>> This series add virtio gpu userptr support and add libhsakmt capset.
>> The userptr feature is used for let host access guest user space memory,
>> this feature is used for GPU compute use case, to enable ROCm/OpenCL native
>> context. It should be pointed out that we are not to implement SVM here,
>> this is just a buffer based userptr implementation.
>> The libhsakmt capset is used for ROCm context, libhsakmt is like the role
>> of libdrm in Mesa.
>>
>> Patches 1-2 add libhsakmt capset and userptr blob resource flag.
> 
> libhsakmt and userptr are orthogonal from each other.
> Should the libhsakmt context be a separate patch series?

I will separate libhsakmt capset patch into another patch series.

> 
>> Patches 3-5 implement basic userptr feature, in some popular bench marks,
>> it has an efficiency of about 70% compared to bare metal in OpenCL API.
>> Patch 6 adds interval tree to manage userptrs and prevent duplicate creation.
>>
>> V2: - Split add HSAKMT context and blob userptr resource to two patches.
>>      - Remove MMU notifier related patches, cause use not moveable user space
>>        memory with MMU notifier is not a good idea.
>>      - Remove HSAKMT context check when create context, let all the context
>>        support the userptr feature.
>>      - Remove MMU notifier related content in cover letter.
>>      - Add more comments  for patch 6 in cover letter.
> 
> I have not looked at the implementation, but thanks for removing the MMU
> notifier support.  Should the interval tree be added before the feature
> is exposed to userspace?  That would prevent users who are doing kernel
> bisects from temporarily exposing a buggy feature to userspace.
Ok I will add interval tree patch before introduce the feature into user 
space in next version. Really thanks for the review.