[libvirt] [PATCH v3 00/11] Autoselect a DRM node for egl-headless add it to cmdline

[Erik Skultety]

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1628892.
The problem is that we didn't put the DRI device into the namespace for QEMU to
access, but that was only a part of the issue. The other part of the issue is
that QEMU doesn't support specifying 'rendernode' for egl-headless yet (patches
are already in upstream) Instead, QEMU's been autoselecting the DRI device on
its own. There's no compelling reason for libvirt not doing that instead and
thus prevent any permission-related issues.

Since v1:
- updated capabilities to 3.1.0-rc2 containing the necessary QEMU patches
- provided more test cases as requested
- added a new XML sub-element <gl> for egl-headless graphics type

Since v2:
- The cmdline code wouldn't play nicely with old QEMU where I'd pick a
rendernode automatically and then fail if we didn't have the corresponding
capability, so this was fixed for v3
- v2 converted some tests to CAPS_LATEST only which would also be wrong because
QEMU can still pick a DRM node so that's a valid use case (not a practical one
though)
- the 3.1.0 capabilities patch was merged separately

Erik Skultety (11):
  util: Introduce virHostGetDRMRenderNode helper
  conf: Introduce virDomainGraphics-related helpers
  qemu: process: spice: Pick the first available DRM render node
  qemu: command: Introduce qemuBuildGraphicsEGLHeadlessCommandLine
    helper
  qemu: caps: Introduce QEMU_EGL_HEADLESS_RENDERNODE capability
  conf: gfx: Add egl-headless as a member to virDomainGraphicsDef struct
  conf: gfx: egl-headless: Introduce a new <gl> subelement
  qemu: domain: egl-headless: Add the DRI device into the namespace
  qemu: cgroup: gfx: egl-headless: Add the DRI device into the cgroup
    list
  security: dac: gfx: egl-headless: Relabel the DRI device
  qemu: command: gfx: egl-headless: Add 'rendernode' option to the
    cmdline

 docs/formatdomain.html.in                     | 11 ++-
 docs/schemas/domaincommon.rng                 | 17 +++-
 src/conf/domain_conf.c                        | 84 +++++++++++++++++++
 src/conf/domain_conf.h                        | 12 +++
 src/libvirt_private.syms                      |  4 +
 src/qemu/qemu_capabilities.c                  |  2 +
 src/qemu/qemu_capabilities.h                  |  1 +
 src/qemu/qemu_cgroup.c                        | 10 +--
 src/qemu/qemu_command.c                       | 42 +++++++++-
 src/qemu/qemu_domain.c                        |  9 +-
 src/qemu/qemu_process.c                       | 32 ++++++-
 src/security/security_dac.c                   | 15 ++--
 src/util/virutil.c                            | 53 ++++++++++++
 src/util/virutil.h                            |  2 +
 .../caps_3.1.0.x86_64.xml                     |  1 +
 ...egl-headless-rendernode.x86_64-latest.args | 31 +++++++
 .../graphics-egl-headless-rendernode.xml      | 33 ++++++++
 .../graphics-egl-headless.x86_64-latest.args  | 31 +++++++
 .../graphics-spice-gl-no-rendernode.args      | 25 ++++++
 .../graphics-spice-gl-no-rendernode.xml       | 24 ++++++
 ...play-spice-egl-headless.x86_64-latest.args |  2 +-
 ...isplay-vnc-egl-headless.x86_64-latest.args |  2 +-
 tests/qemuxml2argvmock.c                      |  9 ++
 tests/qemuxml2argvtest.c                      |  2 +
 .../graphics-egl-headless-rendernode.xml      | 41 +++++++++
 tests/qemuxml2xmltest.c                       |  2 +
 26 files changed, 464 insertions(+), 33 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/graphics-egl-headless-rendernode.x86_64-latest.args
 create mode 100644 tests/qemuxml2argvdata/graphics-egl-headless-rendernode.xml
 create mode 100644 tests/qemuxml2argvdata/graphics-egl-headless.x86_64-latest.args
 create mode 100644 tests/qemuxml2argvdata/graphics-spice-gl-no-rendernode.args
 create mode 100644 tests/qemuxml2argvdata/graphics-spice-gl-no-rendernode.xml
 create mode 100644 tests/qemuxml2xmloutdata/graphics-egl-headless-rendernode.xml

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2.19.1