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<!doctype html>
<!-- SPDX-FileCopyrightText: 2019-2020, 2022, 2024 Alyssa Ross <hi@alyssa.is> -->
<!-- SPDX-License-Identifier: CC-BY-SA-4.0 OR GFDL-1.3-no-invariants-or-later -->
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<title>Cloud Hypervisor with virtio-gpu support</title>
<body>
<nav>
<a href="../..">Spectrum</a>
</nav>
<h1>Cloud Hypervisor with virtio-gpu support</h1>
<p>
This is a patchset for <a href="https://cloudhypervisor.org/">Cloud
Hypervisor</a> support providing a virtio-gpu device to guests,
using <a href="https://crosvm.dev/">crosvm</a>’s virtio-gpu
implementation
over <a href="https://www.qemu.org/docs/master/interop/vhost-user.html">vhost-user</a>.
<p>
If this patchset is useful to you, please consider donating to support
its continued development via
either <a href="https://github.com/sponsors/alyssais">GitHub
Sponsors</a> or <a href="https://liberapay.com/qyliss">LiberaPay</a>.
<p>
The patches as developed as part of <a href="../..">Spectrum</a>, a
compartmentalized desktop operating system project.
<h2>Building</h2>
It’s necessary to patch both Cloud Hypervisor itself, and
the <a href="https://github.com/rust-vmm/vhost/tree/main/vhost">vhost</a>
crate. The Cloud Hypervisor patches expect to find the patched vhost
source tree under the same parent directory as Cloud Hypervisor’s.
<ol>
<li>
Clone the repositories
for <a href="https://github.com/cloud-hypervisor/cloud-hypervisor">Cloud
Hypervisor</a>
and <a href="https://github.com/rust-vmm/vhost">vhost</a>. Make
sure the revision of the vhost repository you have checked out
contains the versions of the vhost and vhost-user-backend crates
expected by your version of Cloud Hypervisor.
<li>
Download and apply the patches for the correct versions of Cloud
Hypervisor and vhost.
<li>
Use <code>cargo build</code> in the Cloud Hypervisor source tree as
normal.
</ol>
<h2>Usage example</h2>
Start the crosvm GPU device:
<pre><code>crosvm device gpu --socket gpu.sock</code></pre>
Connect to the GPU device with cloud-hypervisor:
<pre><code>cloud-hypervisor --gpu socket=gpu.sock …</code></pre>
<h2>Downloads</h2>
<ol reversed style="list-style-type: none; padding-left: 0;">
<li><a href="https://spectrum-os.org/software/cloud-hypervisor/cloud-hypervisor-37.0-spectrum0-patches.tar.xz">cloud-hypervisor-37.0-spectrum0-patches.tar.xz</a>
</ol>
<h2>Contributing</h2>
<p>
The patches are maintained
in <a href="https://spectrum-os.org/git/spectrum">Spectrum’s git
repository</a>. Please refer to the documentation
for <a href="https://spectrum-os.org/doc/contributing/">contributing
to Spectrum</a>.
<h2>Can these patches be upstreamed?</h2>
<p>
I don’t think so. The Cloud Hypervisor developers
are <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/issues/3212#issuecomment-937823742">not
very interested</a> in GPU support — although perhaps an
implementation that was just a vfio-user frontend implementation,
deletaging all of the complexity of rendering, input handling, etc. to
another process would be light enough to overcome that — but on top of
that, communicating with crosvm’s GPU device requires using
non-standard commands that are not part of
the <a href="https://www.qemu.org/docs/master/interop/vhost-user.html">vhost-user
specification</a>.
<p>
It’s possible that, in future, it might be possible to use an external
virtual GPU device with an unmodified Cloud Hypervisor
using <a href="https://spdk.io/news/2021/05/04/vfio-user/">vfio-user</a>
or <a href="https://lore.kernel.org/qemu-devel/20230901110018.3704459-1-alex.bennee@linaro.org/"><code>VHOST_USER_PROTOCOL_F_PROBE</code></a>,
or that at least the custom vhost-user commands could be standardized.
<p>
Other Cloud Hypervisor work is
regularly <a href="https://github.com/cloud-hypervisor/cloud-hypervisor/commits?author=alyssais">upstreamed</a>
as part of the Spectrum project.
<h2>Bug reports and other questions</h2>
<p>
Bug reports for and other questions about the patchset are welcome!
You can send mail to
the <a href="mailto:discuss@spectrum-os.org">discuss@spectrum-os.org</a>
<a href="https://spectrum-os.org/doc/contributing/communication.html#mailing-lists">mailing
list</a>, or ask in the
Spectrum <a href="https://spectrum-os.org/doc/contributing/communication.html#chat">Matrix
chat</a>.
<hr>
<p>
<small>Permission is granted to copy, distribute and/or modify this
document under either the terms of the
<a href="https://creativecommons.org/licenses/by-sa/4.0/">Creative
Commons Attribution-ShareAlike 4.0 International License</a>, or the
<a href="https://www.gnu.org/licenses/fdl-1.3.html">GNU Free
Documentation License, Version 1.3</a> or any later version published
by the Free Software Foundation; with no Invariant Sections, no
Front-Cover Texts, and no Back-Cover Texts.</small>
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