Re: [Qemu-devel] [PATCH] Add definitions for current cpu models..

[Jamie Lokier]

john cooper wrote:
> As before a cpu feature 'check' option is added which warns when
> feature flags (either implicit in a cpu model or explicit on the
> command line) would have otherwise been quietly unavailable to a
> guest:
> 
>     # qemu-system-x86_64 ... -cpu Nehalem,check
>     warning: host cpuid 0000_0001 lacks requested flag 'sse4.2' [0x00100000]
>     warning: host cpuid 0000_0001 lacks requested flag 'popcnt' [0x00800000]

That's a nice feature.  Can we have a 'checkfail' option which refuses
to run if a requested capability isn't available?  Thanks.

I foresee wanting to iterate over the models and pick the latest one
which a host supports - on the grounds that you have done the hard
work of ensuring it is a reasonably good performer, while "probably"
working on another host of similar capability when a new host is made
available.

-- Jamie