Re: [Xen-devel] [PATCH 0/7] Optionally add libvchan to stubdom

[Marek Marczykowski <marmarek@xxxxxxxxxxxxxxxxxxxxxx>]

On 29.04.2013 00:52, Samuel Thibault wrote:
> Marek Marczykowski, le Fri 26 Apr 2013 16:45:05 +0200, a Ãcrit :
>> One unsolved problem is implementation of xc_gntshr_share_page_notify. On 
>> Linux,
>> there is kernel, which can notify remote in case of server process death. In
>> stubdom there is no such place - if exit() is called anywhere, the whole
>> stubdom is terminated.
> 
> We could implement an atexit.
> 
>> Also the common case is stubdom destruction (the case
>> for ioemu stubdom - it is destroyed by toolstack at domain shutdown), I don't
>> know if stubdom even support clean shutdown.
> 
> It does since recently, see the app_shutdown() hook.

Nice.
Any chances to call it for ioemu stubdomains by libxl (even if main domain
crashes)?
Currently I see no users of app_shutdown(), right?

So one solution is to require all libvchan users register libxenvchan_close
with atexit.

Or perhaps the better idea is implement properly xc_gntshr_share_page_notify
with some callback from shutdown_thread?

-- 
Best Regards / Pozdrawiam,
Marek Marczykowski
Invisible Things Lab

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