[libvirt] [RFC PATCH 00/17] Add vhost-user-gpu support

[Marc-André Lureau]

ping
On Fri, Jul 13, 2018 at 3:28 PM <marcandre.lureau at redhat.com> wrote:
>
> From: Marc-André Lureau <marcandre.lureau at redhat.com>
>
> Hi,
>
> This series of patches add support for running a virtio GPU in a
> seperate process, using vhost-user.
>
> The QEMU series "[PATCH v4 00/29] vhost-user for input & GPU" is still
> under review, and will hopefully land in 3.1. There are several
> benefits of running the GPU process in an external process, since Mesa
> is rather heavy on the qemu main loop, and may block for a while or
> crash. I observe x5 performance improvements with Unigine Heaven 4
> benchmark.
>
> The external GPU process is started with one end of the vhost-user
> socket pair, the other end is given to a QEMU chardev. It is also
> added to the emulator cgroup to restrict its CPU usage.
>
> vhost-user requires shared VM memory. A few preliminary patches ease
> and improve shared memory setup, when no explicit domain NUMA
> configuration is given. Also, if there is no need for file-backed
> memory, teach libvirt to make use of memfd memory backend, which has
> better security guarantees and is easier to setup.
>
> Review welcome!
>
> Marc-André Lureau (17):
>   qemu: setup shared memory without explicit numa configuration
>   qemu: add memory-backend-memfd capability check
>   qemu: use memory-backend-memfd if possible
>   qemu: add vhost-user-gpu capabilities
>   domain: add "vhost-user" video type
>   qemu: fill the vhost-user video type capability
>   qemu: check that qemu is vhost-user-vga capable
>   qemu: vhost-user is valid as non-primary video device
>   qemu: validate vhost-user video model
>   qemu: add qemuSecurityStartVhostUserGPU helper
>   qemu: add vhost-user-gpu helper unit
>   qemu: restrict 'virgl=' option to 'virtio' video type
>   qemu: set default address type on vhost-user video model
>   qemu: start/stop the vhost-user-gpu external device
>   qemu: build vhost-user-backend for vhost-user-gpu
>   qemu: build vhost-user-gpu video device arguments
>   tests: add vhost-user-gpu xml2argv tests
>
>  docs/formatdomain.html.in                     |   5 +-
>  docs/schemas/domaincommon.rng                 |   1 +
>  src/conf/device_conf.h                        |   1 +
>  src/conf/domain_conf.c                        |   4 +-
>  src/conf/domain_conf.h                        |   1 +
>  src/qemu/Makefile.inc.am                      |   2 +
>  src/qemu/qemu_capabilities.c                  |  10 +
>  src/qemu/qemu_capabilities.h                  |   5 +
>  src/qemu/qemu_command.c                       | 191 ++++++++---
>  src/qemu/qemu_domain.c                        |   8 +-
>  src/qemu/qemu_domain_address.c                |   4 +-
>  src/qemu/qemu_extdevice.c                     |  47 ++-
>  src/qemu/qemu_process.c                       |   6 +-
>  src/qemu/qemu_security.c                      |  48 +++
>  src/qemu/qemu_security.h                      |   6 +
>  src/qemu/qemu_vhost_user_gpu.c                | 318 ++++++++++++++++++
>  src/qemu/qemu_vhost_user_gpu.h                |  48 +++
>  tests/domaincapsschemadata/full.xml           |   1 +
>  .../caps_2.12.0.aarch64.xml                   |   1 +
>  .../caps_2.12.0.ppc64.xml                     |   1 +
>  .../caps_2.12.0.s390x.xml                     |   1 +
>  .../caps_2.12.0.x86_64.xml                    |   1 +
>  .../qemucapabilitiesdata/caps_3.0.0.ppc64.xml |   1 +
>  .../caps_3.0.0.x86_64.xml                     |   1 +
>  .../fd-memory-no-numa-topology.args           |   4 +
>  tests/qemuxml2argvdata/memfd.args             |  28 ++
>  tests/qemuxml2argvdata/memfd.xml              |  32 ++
>  .../vhost-user-gpu-secondary.args             |  34 ++
>  .../vhost-user-gpu-secondary.xml              |  38 +++
>  tests/qemuxml2argvdata/vhost-user-vga.args    |  31 ++
>  tests/qemuxml2argvdata/vhost-user-vga.xml     |  35 ++
>  tests/qemuxml2argvtest.c                      |  14 +
>  32 files changed, 877 insertions(+), 51 deletions(-)
>  create mode 100644 src/qemu/qemu_vhost_user_gpu.c
>  create mode 100644 src/qemu/qemu_vhost_user_gpu.h
>  create mode 100644 tests/qemuxml2argvdata/memfd.args
>  create mode 100644 tests/qemuxml2argvdata/memfd.xml
>  create mode 100644 tests/qemuxml2argvdata/vhost-user-gpu-secondary.args
>  create mode 100644 tests/qemuxml2argvdata/vhost-user-gpu-secondary.xml
>  create mode 100644 tests/qemuxml2argvdata/vhost-user-vga.args
>  create mode 100644 tests/qemuxml2argvdata/vhost-user-vga.xml
>
> --
> 2.18.0.129.ge3331758f1
>
> --
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-- 
Marc-André Lureau