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Re: [libvirt] [PATCH V2] Expose all CPU features in host definition

On Thu, Jul 18, 2013 at 02:37:33PM +0100, Daniel P. Berrange wrote:
> On Mon, Jul 15, 2013 at 01:45:56PM -0600, Don Dugger wrote:
> [snip]
> We've been going back & forth a while now, and I don't think we're ever
> going to agree on this matter.
> To move this forward, I'm prepared to accept an API addition that lets
> apps get the full list of CPU feature flags, provided that there is no
> change to the existing default behaviour of our APIs. eg it should be
> an opt-in decision

You took the words out of my mouth :-), I was actually thinking about
proposing something along these lines.  I agree, this is a good compromise
and I'll work up a patch along the lines you propose.

> IIUC, in essence you want a way to take the host CPU description (as
> generated in the XML for virConnectGetCapabilties), and expand this
> see the full set of features that are able to be presented to the guest.
> I think this could probably be done by adding a flag to the existing
> virConnectBaselineCPU API. eg something like
>    capsxml = virConnectGetCapabilties()
>    cpuxml = ...extract the <cpu> bit of capsxml...
>    newxml = virConnectBaselineCPU(conn, &cpuxml, 1,
>                                   VIR_CONNECT_BASELINE_CPU_EXPAND_FEATURES)
> Daniel
> -- 
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Don Dugger
"Censeo Toto nos in Kansa esse decisse." - D. Gale
n0ano n0ano com
Ph: 303/443-3786

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