[libvirt] [PATCH V5] Add libxenlight driver

[Jim Fehlig]

Markus Groß wrote:
> Am Donnerstag 10 März 2011 07:45:49 schrieb Jim Fehlig:
>   
>> Add a new xen driver based on libxenlight [1], which is the primary
>> toolstack starting with Xen 4.1.0.  The driver is stateful, runs
>> privileged only, and is accessed with libxl:/// URI.
>>
>> V5:
>>  - Ensure events are unregistered when domain private data
>>    is destroyed.  Discovered and fixed by Markus Gross.
>>
>> V4:
>>  - Handle restart of libvirtd, reconnecting to previously
>>    started domains
>>  - Rebased to current master
>>  - Tested against Xen 4.1 RC7-pre (c/s 22961:c5d121fd35c0)
>>
>> V3:
>>   - Reserve vnc port within driver when autoport=yes
>>
>> V2:
>>   - Update to Xen 4.1 RC6-pre (c/s 22940:5a4710640f81)
>>   - Rebased to current master
>>   - Plug memory leaks found by Stefano Stabellini and valgrind
>>   - Handle SHUTDOWN_crash domain death event
>>
>> [1]
>> http://lists.xensource.com/archives/html/xen-devel/2009-11/msg00436.html
>>     
>
> The libxlEventHandler needs to hold an extra reference to the 
> corresponding "vm" object.
> Otherwise the handler will try to access an invalid vm object under certain 
> race conditions.
>
> I fixed it using the following patch.
> Now the libxl driver keeps an extra reference of the vm object for the event 
> handler and specifies a free callback function.
> This free callback function removes the reference to the vm object to avoid a 
> memory leak.
>   

Thanks Markus.  I've incorporated this into V6, which I'll send out shortly.

Regards,
Jim