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

[marcandre.lureau at redhat.com]

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