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Message-ID: <4B230D9A.4050701@codemonkey.ws>
Date: Fri, 11 Dec 2009 21:27:22 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] Spice project is now open
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To: Chris Wright <chrisw@sous-sol.org>
Cc: Yaniv Kamay <ykamay@redhat.com>, Izik Eidus <ieidus@redhat.com>, qemu-devel@nongnu.org

Chris Wright wrote:
> * Anthony Liguori (anthony@codemonkey.ws) wrote:
>   
>> Izik Eidus wrote:
>>     
>>> Ok, I guess you think VDI-interfaces are doing much more than they do
>>> in reiality.
>>>
>>> It is just simple interface to Allow Spice / VNC / whatever not have to
>>> de-duplicate code in order to get information from - lets say the
>>> keyboard....
>>>
>>> Is it really diffrence from any other function callbacks that used for
>>> such purpuse?
>>>   
>>>       
>> Plugin interfaces have been discussed a few times in the past.  The  
>> concerns have been 1) they will be abused with the introduction of  
>> proprietary plugins 2) we would have tremendous difficulty maintaining a  
>> stable plugin abi 3) they would create stability issues in qemu because  
>> the plugin quality cannot be controlled.
>>     
>
> I think you're talking about dlopen() vs. direct linkage of .so?
>
> Here's some code to ground things a bit.
>
> ifdef CONFIG_SPICE
> CFLAGS+=$(SPICE_CFLAGS)
> LIBS+=$(SPICE_LIBS)
> endif
>
> And specifically, there's a notion of the VDI interface added to
> core qemu, which can be extended by simply registering callbacks to that
> interface:
>
> vl.c::main()
> ...
> #ifdef CONFIG_SPICE
> 	...
> 	spice_init(&core_interface);.
> #endif
>   

Ah, that's entirely reasonable.  When user provided libraries was 
mentioned, I assumed dlopen() style plugins.

Regards,

Anthony Liguori