[PATCH 0/6] drm: Add mouse cursor hotspot support to atomic KMS

Daniel Vetter daniel at ffwll.ch
Fri Jun 10 09:49:07 UTC 2022

On Fri, Jun 10, 2022 at 09:15:35AM +0000, Simon Ser wrote:
> On Friday, June 10th, 2022 at 10:41, Daniel Vetter <daniel at ffwll.ch> wrote:
> > Anything I've missed? Or got completely wrong?
> This plan looks good to me.
> As Pekka mentionned, I'd also like to have a conversation of how far we want to
> push virtualized driver features. I think KMS support is a good feature to have
> to spin up a VM and have all of the basics working. However I don't think it's
> a good idea to try to plumb an ever-growing list of fancy features
> (seamless integration of guest windows into the host, HiDPI, multi-monitor,
> etc) into KMS. You'd just end up re-inventing Wayland or RDP on top of KMS.
> Instead of re-inventing these, just use RDP or waypipe or X11 forwarding
> directly.
> So I think we need to draw a line somewhere, and decide e.g. that virtualized
> cursors are fine to add in KMS, but HiDPI is not.

It's getting a bit far off-topic, but google cros team has an out-of-tree
(at least I think it's not merged yet) wayland-virtio driver for exactly
this use-case. Trying to move towards something like that for fancy
virtualized setups sounds like the better approach indeed, with kms just
as the bare-bones fallback option.
Daniel Vetter
Software Engineer, Intel Corporation

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