[libvirt-users] How to config qga to support dompmsuspend

[Michal Privoznik]

On 10.07.2014 10:54, Hong-Hua.Yin at freescale.com wrote:
> Hi,
>
> I tried to run domsuspend command on my PowerPC board but failed.
> # virsh dompmsuspend sdk --target mem
> error: Domain sdk could not be suspended
> error: argument unsupported: QEMU guest agent is not configured

You need to configure the guest agent:

http://wiki.libvirt.org/page/Qemu_guest_agent

>
>
> It seemed that support suspend-to-mem only from capabilities.
>
> # virsh capabilities
> <capabilities>
>
>    <host>
>      <uuid>52498f7c-d584-45d8-8a15-345b14fa0d10</uuid>
>      <cpu>
>        <arch>ppc</arch>
>        <topology sockets='1' cores='2' threads='1'/>
>        <pages unit='KiB' size='4'/>
>        <pages unit='KiB' size='1024'/>
>        <pages unit='KiB' size='4096'/>
>        <pages unit='KiB' size='16384'/>
>        <pages unit='KiB' size='65536'/>
>        <pages unit='KiB' size='262144'/>
>        <pages unit='KiB' size='1048576'/>
>      </cpu>
>      <power_management>
>        <suspend_mem/>

This express the *host* PM capabilities (virsh nodesuspend) not the 
guest (virsh dompmsuspend). The guest ACPI capabilities can be found 
under domain XML:

<domain type='kvm'>
   <name>gentoo</name>
   <uuid>a75aca4b-a02f-2bcb-4a91-c93cd848c34b</uuid>
   ...
   <on_poweroff>destroy</on_poweroff>
   <on_reboot>restart</on_reboot>
   <on_crash>restart</on_crash>
   <pm>
     <suspend-to-mem enabled='yes'/>
     <suspend-to-disk enabled='yes'/>
   </pm>
   <devices/>
</domain>

These are purely on mgmt application (or users) decision. Can be enabled 
or disabled as you wish.

Michal