[libvirt] how libvirt communicate with qemu?

[Kashyap Chamarthy]

On 10/21/2012 03:12 PM, yue wrote:
> i am reading source code, begin with tracing simple command line ,like virsh list and forth.
> please look at my qurestions
> 1.how libvirt communicate with qemu?

For starters, before diving into code, I'm learning it this way, by tracing all the
commands(let it be Qemu's QMP or others) virsh is calling:

Place the below log filters in /etc/libvirt/libvirtd.conf.
----
log_filters="1:libvirt 1:qemu_monitor 1:util 1:qemu"
log_outputs="1:file:/var/log/libvirt/libvirtd.log"
----

And, monitor /var/log/libvirt/libvirtd.log for all the calls libvirt is making.

For your other questions, I'll let more qualified people answer it.

/kashyap


> call qemu'lib or open special device/socket?
>  
> 2. i do not find the implement of function qemuAgentOpen---->qemuAgentInitialize().
> i also search qemu-kvm source
>  
> 3. qemuListAllDomains  is the function which corespond to virsh-list.   please explain
> this function .
>  virDomainList(conn, driver->domains.objs, domains, flags);
>  i) it seems driver->domains.objs  have gotten all dmains.   so when and where  
> driver->domains.objs   is  assigned.
> ii)and what is conn,and its definition?
>  
> thanks.
> 
> 
> 
> 
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