Re: [Xci-devel] Which API for VM lifecycle?

[Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxxx>]

Andreas Sommer wrote:
> As far as I understand xenvm/xenops (toolstack.git/xenvm/*.ml) are only 
> frontends to the xenops library files (toolstack.git/xenops/*.ml) which 
> in turn are helper functions for libxc calls. Is that correct? And if 
> so, could I simply use libxc's functions for doing simple tasks in XCI 
> (using C as programming language)?
the xenops library is "just" libxc and libxenstore calls in sequences, 
however the whole point of the library is actually to hide the 
complexity of having to do the calls yourself.
so the quick answer is yes, you could just calls libxc functions, just 
like you can do that too with xend (the legacy opensource toolstack), 
but it wouldn't be very easy. (it would be the same as playing piano 
with just the raw strings and a hammer)
note that there's an in-development C library to replace xenops and 
provide the same level of functionality, that is available on 
xen-unstable that hide libxc and libxenstore calls, which is called 
libxenlight, which you might be interested to look at. it's not yet 
available in the XCI tree, but there's a plan to make it available there 
when it's ready.
for extremely simple functions like pausing/unpausing/listing domain(s), 
you could do that trivially with libxc.
--
Vincent

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