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Re: Why memory lending is needed for GPU acceleration
- To: Teddy Astie <teddy.astie@xxxxxxxxxx>
- From: Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 3 Apr 2026 23:24:07 +0200
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- Cc: Val Packett <val@xxxxxxxxxxxxxxxxxxxxxx>, Demi Marie Obenour <demiobenour@xxxxxxxxx>, Xen developer discussion <xen-devel@xxxxxxxxxxxxxxxxxxxx>, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, Ariadne Conill <ariadne@ariadne.space>
- Delivery-date: Fri, 03 Apr 2026 21:24:30 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Tue, Mar 31, 2026 at 09:42:22AM +0000, Teddy Astie wrote:
> XEN_GNTDEV_DMABUF has been designed for GPU use-cases, and more
> precisely for paravirtualizing a display. The only issue I would have
> with it is that grants are not scalable for GPU 3D use cases (with
> hundreds of MB to share).
FWIW we do use grants for graphics buffers already - window composition
buffers specifically. We do run xen with extra options for that:
gnttab_max_frames=2048 gnttab_max_maptrack_frames=4096
And similarly, on domU side:
echo 1073741824 > /sys/module/xen_gntalloc/parameters/limit
--
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab
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