[libvirt PATCH 0/3] Enable copy/paste for vnc displays

[Jonathon Jongsma]

This patch series enables support for the qemu-vdagent character device which
enables copy/paste support between guest and client when using vnc graphics.

The guest must be configured with something like the following:

    <channel type='qemu-vdagent'>
      <source clipboard='on' mouse='on'/>
      <target type='virtio' name='com.redhat.spice.0'/>
    </channel>

Copy/paste sync requires a vnc client that has support for copy/paste commands.
Currently virt-viewer does not work, but the version of tigervnc provided by
fedora (executable name 'vncviewer') does work.

More details about this device on Gerd's blog:
https://www.kraxel.org/blog/2021/05/qemu-cut-paste/

OPEN QUESTIONS:

- I'm not fully convinced that the `<source>` element is the right place for
  the new `clipboard` / `mouse` configuration options, but I'm not sure that
  adding a new xml element to the `<channel>` is the right approach either.
  Suggestions welcome.
- There may be an expectation that vnc clipboard is enabled using the
  <graphics type='vnc'><clipboard copypaste='yes'/></graphics> similar to what
  spice offers. In fact, it seems that this is the approach Marc-Andre took
  when adding copy/paste support in his dbus display patch series. But even for
  spice, this <clipboard> configuration element is not enough to enable the
  copy/paste feature. It also requires a 'spicevmc' character device to be
  added to the domain.

Jonathon Jongsma (3):
  qemu: add capability for qemu-vdagent chardev
  conf: add qemu-vdagent channel
  qemu: add support for qemu-vdagent channel

 docs/formatdomain.rst                         | 17 ++++++
 src/conf/domain_conf.c                        | 49 ++++++++++++++++-
 src/conf/domain_conf.h                        |  7 +++
 src/conf/domain_validate.c                    |  1 +
 src/conf/schemas/domaincommon.rng             | 11 ++++
 src/qemu/qemu_capabilities.c                  |  2 +
 src/qemu/qemu_capabilities.h                  |  1 +
 src/qemu/qemu_command.c                       | 13 +++++
 src/qemu/qemu_monitor_json.c                  | 10 ++++
 src/qemu/qemu_process.c                       |  1 +
 src/qemu/qemu_validate.c                      |  1 +
 src/security/security_dac.c                   |  2 +
 .../caps_6.1.0.x86_64.xml                     |  1 +
 .../caps_6.2.0.aarch64.xml                    |  1 +
 .../caps_6.2.0.x86_64.xml                     |  1 +
 .../caps_7.0.0.x86_64.xml                     |  1 +
 .../channel-qemu-vdagent.x86_64-latest.args   | 41 ++++++++++++++
 .../qemuxml2argvdata/channel-qemu-vdagent.xml | 34 ++++++++++++
 tests/qemuxml2argvtest.c                      |  1 +
 .../channel-qemu-vdagent.x86_64-latest.xml    | 55 +++++++++++++++++++
 tests/qemuxml2xmltest.c                       |  1 +
 tests/testutilsqemu.c                         |  1 +
 22 files changed, 250 insertions(+), 2 deletions(-)
 create mode 100644 tests/qemuxml2argvdata/channel-qemu-vdagent.x86_64-latest.args
 create mode 100644 tests/qemuxml2argvdata/channel-qemu-vdagent.xml
 create mode 100644 tests/qemuxml2xmloutdata/channel-qemu-vdagent.x86_64-latest.xml

-- 
2.35.1