general high-level discussion about spectrum
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From: Thomas Leonard <talex5@gmail.com>
To: Alyssa Ross <hi@alyssa.is>
Cc: discuss@spectrum-os.org
Subject: Re: Using virtio-gpu instead of virtwl
Date: Tue, 19 Apr 2022 12:58:15 +0000	[thread overview]
Message-ID: <CAG4opy_RS+4zR-xg-P8h3qUrSVT68JUZZkG73Z+KQv5uB5F-Zg@mail.gmail.com> (raw)
In-Reply-To: <20220414135737.lvfbrch34kjojn3s@eve>

On Thu, 14 Apr 2022 at 13:57, Alyssa Ross <hi@alyssa.is> wrote:
>
> On Wed, Apr 13, 2022 at 05:12:13PM +0000, Thomas Leonard wrote:
> > On Wed, 6 Apr 2022 at 12:19, Thomas Leonard <talex5@gmail.com> wrote:
> > [ converting from virtwl to virtio-gpu ]
> > > I tried, but failed, to figure out the protocol. I did manage to get a
> > > test application showing a little animation, but it crashes after a
> > > few seconds.
> >
> > OK, I found a solution to this: you can just open the device file
> > twice and use one instance for Wayland messages and the other for
> > allocating images. This avoids the first race. With that, I got the
> > proxy converted:
> >
> >   https://github.com/talex5/wayland-proxy-virtwl/pull/28
> >
> > Though I'm not sure it's an improvement: +1,819 −577 lines!
> >
> > Instructions for configuring crosvm to use it:
> >
> >   https://github.com/talex5/wayland-proxy-virtwl#virtio-gpu-support
> >
> > And I wrote up my guesses about the protocol here:
> >
> >   https://github.com/talex5/wayland-proxy-virtwl/blob/master/virtio-spec.md
>
> That's extremely helpful, thanks for writing it up!
>
> > I don't think it's possible to avoid races completely, but it seems to
> > be working reasonably well so far.
>
> I wonder if it would be worth asking about the remaining problems on the
> relevant kernel mailing lists, since they sound like protocol issues
> rather than anything specific to your implementation.

The kernel isn't involved in any of the problems - it just relays
opaque messages between the host and the guest. So probably
crosvm/sommelier will sort things out by themselves after a while (and
I'll need to update the proxy when that happens).

> I tracked down the series where they were added[1], perhaps the
> From/To/Cc in that posting would be a good starting point?
>
> If you do reach out, please CC me (and this list, if you want)!
>
> [1]: https://lore.kernel.org/dri-devel/20210921232024.817-1-gurchetansingh@chromium.org/


-- 
talex5 (GitHub/Twitter)
http://roscidus.com/blog/

  reply	other threads:[~2022-04-19 11:58 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-05 19:27 New user getting started questions Thomas Leonard
2021-01-05 20:09 ` Michael Raskin
2021-01-06  7:04   ` Alyssa's break Alyssa Ross
2021-01-06  9:11     ` Michał "rysiek" Woźniak
2021-01-06  7:00 ` New user getting started questions Alyssa Ross
2021-01-06 15:56   ` Thomas Leonard
2021-01-07 11:38     ` Thomas Leonard
2021-01-07 15:33     ` Thomas Leonard
2021-01-14 12:29     ` Alyssa Ross
2021-01-14 12:51       ` Alyssa Ross
2021-01-20 13:04         ` Thomas Leonard
2021-01-27 17:31           ` Thomas Leonard
2021-03-07 12:52             ` Thomas Leonard
2021-03-09 16:59               ` Qubes-lite With KVM and Wayland Alyssa Ross
2021-03-10 14:19                 ` Thomas Leonard
2021-03-10 22:34                   ` Alyssa Ross
2021-03-09 16:25             ` New user getting started questions Alyssa Ross
2021-03-13  7:21               ` Thomas Leonard
2021-03-13 13:52                 ` Alyssa Ross
2021-10-30 12:58                 ` Thomas Leonard
2021-11-03 11:36                   ` Alyssa Ross
2021-11-03 18:27                     ` Thomas Leonard
2021-11-10 12:58                       ` Alyssa Ross
2021-11-10 12:00                         ` Thomas Leonard
2021-11-11 11:09                           ` Alyssa Ross
2021-11-11 16:12                             ` Thomas Leonard
2021-11-12 10:47                               ` Alyssa Ross
2022-03-13 15:08                         ` Thomas Leonard
2022-03-15 14:06                           ` Alyssa Ross
2022-03-15 20:23                             ` Alyssa Ross
2022-03-16 16:18                               ` Using virtio-gpu instead of virtwl Thomas Leonard
2022-03-16 16:54                                 ` Alyssa Ross
2022-03-21 12:10                                 ` Thomas Leonard
2022-03-21 16:05                                   ` Alyssa Ross
2022-03-22 11:08                                     ` Thomas Leonard
2022-03-22 11:16                                       ` Alyssa Ross
2022-03-22 20:05                                         ` Thomas Leonard
2022-04-06 12:19                                           ` Thomas Leonard
2022-04-13 17:12                                             ` Thomas Leonard
2022-04-14 13:57                                               ` Alyssa Ross
2022-04-19 12:58                                                 ` Thomas Leonard [this message]
2022-04-19 12:01                                                   ` Alyssa Ross
2022-05-15 15:20                                                 ` Thomas Leonard
2022-05-16 11:55                                                   ` Alyssa Ross
2022-05-18  9:55                                                     ` Thomas Leonard
2022-06-05 16:29                                                       ` Thomas Leonard
2022-08-09 12:00                                     ` Alyssa Ross
2022-10-10 15:16                                       ` Thomas Leonard
2022-10-10 16:53                                         ` Alyssa Ross

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