[Libvir] [RFC] Host and guest capabilities

[Richard W.M. Jones]

I've been looking into the parts of virtinst which try to probe the 
capabilities of the host directly, rather than being abstracted through 
libvirt (for example, opening and parsing 
/sys/hypervisor/properties/capabilities directly).

Attached is a proposed API for probing the capabilities and supported 
guest architectures of the hypervisor / driver.

I've implemented the virCapabilities part already.  My original 
implementation of the guest architectures had virCapabilities containing 
a list of supported architectures, but that doesn't nearly cover the 
richness of what the underlying drivers could support, so I'm currently 
separating that out into a separate virConnectGetGuestArchitectures call.

Let me know your opinions of this API.

As an aside, the current virt-manager "choose paravirt / fullvirt" 
screen doesn't really capture the full, shall I say, ugliness of the 
possible choices for architecture, particularly when we add qemu, kqemu, 
and emulation in the mix.  I suspect that presenting a list of 
architectures here, perhaps with some options to show only paravirt, 
show only fullvirt, show only accelerated ...

Rich.

-- 
Emerging Technologies, Red Hat  http://et.redhat.com/~rjones/
64 Baker Street, London, W1U 7DF     Mobile: +44 7866 314 421
  "[Negative numbers] darken the very whole doctrines of the equations
  and make dark of the things which are in their nature excessively
  obvious and simple" (Francis Maseres FRS, mathematician, 1759)
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