[RFC PATCH v2 00/10] Initial support for VM Wayland

Alyssa Ross
2022-09-30T21:35:52Z

IMPORTANT NOTE: this series should be applied on top of my previous
series "Introduce a shared base for application VMs" [1]. This is a
bit inconvenient I know, but I haven't committed the other series yet
due to wanting to take a second pass at it.

Changes since v1:
- Fix syntax in img/app development Makefile target.
- Enable virgl for virtio-gpu devices (see below).

v1: https://spectrum-os.org/lists/archives/spectrum-devel/20220928170128.1583791-1-alyssa.ross@unikie.com/

Introduction
------------

This series adds the Spectrum-side support for running VMs that can
display Wayland windows on the host compositor, using virtio-gpu.
There are various small things still to be resolved, but it's ready
for other people to try out and test.

The easiest way to test this out is to run "vm-start hello-wayland" on
the Spectrum host. If everything goes well, a small window with a
picture of a cat (hello-wayland) should appear. This window is
running in a VM.

Currently, virgl is enabled for all virtio-gpu devices. This means
that all VMs will have GPU acceleration enabled. This is currently
required to work around what appears to be a kernel bug that causes
applications to freeze, but is likely not something we want to be
enabling by default once that's fixed.

I have tested with hello-wayland, as in the appvm provided as a
demonstration here, and also with foot (by replacing hello-wayland
with foot in that VM). I haven't done enough testing with this
version of the code to guage how reliably they work yet.

[1]: https://spectrum-os.org/lists/archives/spectrum-devel/20220919073659.1703271-1-hi@alyssa.is/
[2]: https://spectrum-os.org/lists/archives/spectrum-devel/20220928170128.1583791-1-alyssa.ross@unikie.com/

Alyssa Ross (10):
host/start-vm: use MAP_SHARED memory for VMs
img/app: don't block app startup on network online
img/app: add Wayland over virtio-gpu support to kernel
vm-lib: add mesa drivers to VM
img/app: add support for testing virtio-gpu
img/app: add support for testing in crosvm
host/start-vm: factor out VM definition path
host: add support for Wayland in VMs
vm/app: add hello-wayland demo VM
host/start-vm: disable cloud-hypervisor sandbox

Documentation/creating-vms.adoc | 5 +++
host/initramfs/extfs.nix | 3 ++
host/rootfs/Makefile | 4 +++
host/rootfs/default.nix | 4 +--
host/rootfs/etc/s6-rc/ext-rc-init/up | 8 +++++
host/rootfs/etc/template/gpu/data/check | 5 +++
host/rootfs/etc/template/gpu/notification-fd | 1 +
.../etc/template/gpu/notification-fd.license | 2 ++
host/rootfs/etc/template/gpu/run | 9 ++++++
host/rootfs/etc/template/gpu/type | 1 +
host/rootfs/etc/template/gpu/type.license | 2 ++
host/start-vm/start-vm.rs | 26 +++++++++------
img/app/Makefile | 32 +++++++++++++++++--
img/app/default.nix | 3 +-
img/app/etc/mdev/iface | 2 +-
img/app/etc/mdev/listen | 12 +++++++
img/app/etc/mdev/wait | 15 +++++++++
img/app/etc/s6-rc/ok-all/contents | 1 +
img/app/shell.nix | 2 +-
vm-lib/make-vm.nix | 14 ++++++--
vm/app/catgirl.nix | 1 +
vm/app/hello-wayland.nix | 25 +++++++++++++++
vm/app/lynx.nix | 1 +
23 files changed, 159 insertions(+), 19 deletions(-)
create mode 100755 host/rootfs/etc/template/gpu/data/check
create mode 100644 host/rootfs/etc/template/gpu/notification-fd
create mode 100644 host/rootfs/etc/template/gpu/notification-fd.license
create mode 100755 host/rootfs/etc/template/gpu/run
create mode 100644 host/rootfs/etc/template/gpu/type
create mode 100644 host/rootfs/etc/template/gpu/type.license
create mode 100755 img/app/etc/mdev/listen
create mode 100755 img/app/etc/mdev/wait
create mode 100644 vm/app/hello-wayland.nix

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2.37.1