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https://issues.apache.org/jira/browse/CLOUDSTACK-8715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15512514#comment-15512514
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ASF GitHub Bot commented on CLOUDSTACK-8715:
--------------------------------------------

Github user wido commented on the issue:

    https://github.com/apache/cloudstack/pull/1545
  
    @jburwell The old systemVM will also work, but that assumes it's serial 
port is *always* the first port attached.
    
    The XML we generate will make sure that the Qemu Guest Agent port is the 
second one, so the old SSVM template will still work. I run this patch in 
production with 4.9 without a modified SSVM, works fine.
    
    The changes in the SSVM are just there to make it more robust against such 
changes.


> Add support for qemu-guest-agent to libvirt provider
> ----------------------------------------------------
>
>                 Key: CLOUDSTACK-8715
>                 URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8715
>             Project: CloudStack
>          Issue Type: New Feature
>      Security Level: Public(Anyone can view this level - this is the 
> default.) 
>          Components: KVM
>            Reporter: Sten Spans
>            Assignee: Wido den Hollander
>              Labels: kvm, libvirt, qemu, systemvm
>             Fix For: Future
>
>
> The qemu guest agent is a newer part of qemu/kvm/libvirt which exposes quite 
> a lot of useful functionality, which can only be provided by having an agent 
> on the VM. This includes things like freezing/thawing filesystems (for 
> backups), reading files on the guest, listing interfaces / ip addresses, etc.
> This feature has been requested by users, but is currently not implemented.
> http://users.cloudstack.apache.narkive.com/3TTmy3zj/enabling-qemu-guest-agent
> The first change needed is to add the following to the XML generated for KVM 
> virtual machines,:
> <channel type='unix'>
>   <source mode='bind'/>
>   <target type='virtio' name='org.qemu.guest_agent.0'/>
> </channel>
> This provides the communication channel between libvirt and the agent on the 
> host. All in all a pretty simple change to LibvirtComputingResource.java / 
> LibvirtVMDef.java
> Secondly the qemu-guest-agent package needs to be added to the systemvm 
> template.



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