[libvirt] how to adjust the value passed by xml dynamicly
Michal Privoznik
mprivozn at redhat.com
Fri Feb 7 08:42:03 UTC 2014
On 07.02.2014 09:06, yue wrote:
> hi,all
> we can pass value throught xml when start vm. how to adjust the value
> dynamicly as needed while vm is running via API calls?
> for example , change from
> <filterref filter='hcount'>
> <parameter name='HC' value='6'/>
> <parameter name='HC' value='10'/>
> </filterref>
> to
> <filterref filter='hcount'>
> <parameter name='HC' value='16'/>
> <parameter name='HC' value='20'/>
> </filterref>
> i do not want to restart or interrupt the running state of vms(via api,
> not command line tools).
>
These (or any other values) can be changed byt re-defining the domain again:
char *xml = virDomainGetXMLDesc();
/* change the desired values in @xml */
virDomainDefine(conn, xml);
free(xml);
However, this works only on 'config' level - the changes will be applied
the next time domain is started.
For a runtime change, maybe you can use virDomainUpdateDeviceFlags() but
I haven't try if it works with <filterref/>.
Michal
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