[libvirt] how to adjust the value passed by xml dynamicly
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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).
Attachments:
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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
On 02/07/2014 01:42 AM, Michal Privoznik wrote:
> <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).
If you can make the change using the virsh command line tool, then you
can make the same change using API (since virsh is just a shell wrapper
around the API).
For a runtime change, maybe you can use virDomainUpdateDeviceFlags() but
I haven't try if it works with <filterref/>.
I see 'virsh nwfilter-edit' as a way to edit a nwfilter definition; but
I'm not familiar enough with nwfilter to know if live edits of the
hcount filterref will affect a live domain definition. It seems like it
should be doable technically, although it may require someone to write a
patch.
--
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Eric Blake -
Michal Privoznik -
yue