Re: [libvirt] [PATCH 0/4] Add support for QEMU guest agent control
On Thu, Oct 20, 2011 at 09:39:20AM +0900, MATSUDA, Daiki wrote:
(2011/10/06 2:31), Daniel P. Berrange wrote:
>The QEMU guest agent "/usr/bin/qemu-ga" has some handy functions
>for controlling the guest, not least, shutdown/reboot and filesystem
>freeze/thaw.
>
>In Fedora 15/16 the semantics of the ACPI power button have been
>changed to suspend-to-RAM which breaks our current shutdown
>implementation.
>
>By adding support for the agent we gain a more predictable way
>to shutdown / reboot guests.
>
>NB: the code currently has the same "flaw" as the monitor, in
>so much as we wait forever for a guest agent reply. We need to
>add a timeout ability to the agent code
>
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>libvir-list(a)redhat.com
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>
>
The QEMU guest agent has other function FS Freeze. But your patches
does not support it. Do you have a plan ?
I expect Eric will add FS freeze support as part of his ongoing
effort to improve snapshotting.
In addition, the QEMU guest agent requires specified socket. Virt IO
Console, too. But unfortunately libvirt does not support to xml tags
to give socket name options to QEMU for the QEMU guest agent and
Virt IO Console.
Err, yes we do.
<channel type='unix'>
<source mode='bind'
path='/var/lib/libvirt/qemu/f16x86_64.agent'/>
<target type='virtio' name='org.qemu.guest_agent.0'/>
</channel>
Or for the console
<console type='unix'>
<source mode='bind'
path='/var/lib/libvirt/qemu/f16x86_64.console'/>
<target type='virtio'/>
</channel>
though you really want to use type=pty for consoles, so that 'virsh console'
works correctly.
Daniel
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