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Allow multiple consoles per virtual guest

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While Xen only has a single paravirt console, UML, and
QEMU both support multiple paravirt consoles. The LXC
driver can also be trivially made to support multiple
consoles. This patch extends the XML to allow multiple
<console> elements in the XML. It also makes the UML
and QEMU drivers support this config.

* src/conf/domain_conf.c, src/conf/domain_conf.h: Allow
  multiple <console> devices
* src/lxc/lxc_driver.c, src/xen/xen_driver.c,
  src/xenxs/xen_sxpr.c, src/xenxs/xen_xm.c: Update for
  internal API changes
* src/security/security_selinux.c, src/security/virt-aa-helper.c:
  Only label consoles that aren't a copy of the serial device
* src/qemu/qemu_command.c, src/qemu/qemu_driver.c,
  src/qemu/qemu_process.c, src/uml/uml_conf.c,
  src/uml/uml_driver.c: Support multiple console devices
* tests/qemuxml2xmltest.c, tests/qemuxml2argvtest.c: Extra
  tests for multiple virtio consoles. Set QEMU_CAPS_CHARDEV
  for all console /channel tests
* tests/qemuxml2argvdata/qemuxml2argv-channel-virtio-auto.args,
  tests/qemuxml2argvdata/qemuxml2argv-channel-virtio.args
  tests/qemuxml2argvdata/qemuxml2argv-console-virtio.args: Update
  for correct chardev syntax
* tests/qemuxml2argvdata/qemuxml2argv-console-virtio-many.args,
  tests/qemuxml2argvdata/qemuxml2argv-console-virtio-many.xml: New
  test file
This commit is contained in:
Daniel P. Berrange
2011-02-23 18:27:23 +00:00
parent b0a510ad2a
commit 0873b688c6
21 changed files with 256 additions and 90 deletions
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25
docs/formatdomain.html.in
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@@ -2681,12 +2681,29 @@ qemu-kvm -net nic,model=? /dev/null
<h6><a name="elementCharConsole">Console</a></h6>
<p>
This represents the primary console. This can be the paravirtualized
console with Xen guests, virtio console for QEMU/KVM, or duplicates
the primary serial port for fully virtualized guests without a
paravirtualized console.
The console element is used to represent interactive consoles. Depending
on the type of guest in use, the consoles might be paravirtualized devices,
or they might be a clone of a serial device, according to the following
rules:
</p>
<ul>
<li>If no <code>targetType</code> attribue is set, then the default
device type is according to the hypervisor's rules. The default
type will be added when re-querying the XML fed into libvirt.
For fully virtualized guests, the default device type will usually
be a serial port.</li>
<li>If the <code>targetType</code> attribute is <code>serial</code>,
then if no <code>&lt;serial&gt;</code> element exists, the console
element will be copied to the serial element. If a <code>&lt;serial&gt;</code>
element does already exist, the console element will be ignored.</li>
<li>If the <code>targetType</code> attribute is not <code>serial</code>,
it will be treated normally.</li>
<li>Only the first <code>console</code> element may use a <code>targetType</code>
of <code>serial</code>. Secondary consoles must all be paravirtualized.
</li>
</ul>
<p>
A virtio console device is exposed in the
guest as /dev/hvc[0-7] (for more information, see