linux-kernel - Re: [PATCH] gpu: Move DRM buddy allocator one level up

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Message-ID: <20251126094412.23373c13.zhiw@nvidia.com>
Date: Wed, 26 Nov 2025 09:44:12 +0200
From: Zhi Wang <zhiw@...dia.com>
To: Dave Airlie <airlied@...il.com>
CC: Christian König <christian.koenig@....com>, John Hubbard
	<jhubbard@...dia.com>, Joel Fernandes <joelagnelf@...dia.com>,
	<linux-kernel@...r.kernel.org>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, Simona Vetter <simona@...ll.ch>,
	Jonathan Corbet <corbet@....net>, Alex Deucher <alexander.deucher@....com>,
	Jani Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen
	<joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>,
	Tvrtko Ursulin <tursulin@...ulin.net>, Huang Rui <ray.huang@....com>,
	"Matthew Auld" <matthew.auld@...el.com>, Matthew Brost
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	Thomas Hellström <thomas.hellstrom@...ux.intel.com>, Helge
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	<alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo
	<gary@...yguo.net>, "Björn Roy Baron"
	<bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, Trevor Gross <tmgross@...ch.edu>,
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	<nouveau@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
	<rust-for-linux@...r.kernel.org>, <linux-doc@...r.kernel.org>,
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	<intel-xe@...ts.freedesktop.org>, <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH] gpu: Move DRM buddy allocator one level up

On Wed, 26 Nov 2025 06:17:25 +1000
Dave Airlie <airlied@...il.com> wrote:

> On Tue, 25 Nov 2025 at 19:15, Christian König <christian.koenig@....com>
> wrote:
> >
> > On 11/25/25 10:08, Dave Airlie wrote:

snip

> So far I haven't heard anything about needing dma-buf interactions at
> that level, and maybe Zhi has more insight into the future there.
> 

For VFIO parts, the vendor VFIO driver relies on the core driver's support
to export the VM's framebuffer to the userspace either as type a)
VFIO_GFX_PLANE_TYPE_REGION, framebuffer as a region or b)
VFIO_GFX_PLANE_TYPE_DMABUF, framebuffer as a dmabuf, which is usually
backed by a GEM object.

NVIDIA vGPU uses VFIO_GFX_PLANE_TYPE_REGION, so dma-buf interactions
are not required.

> Dave.