Re: [Qemu-devel] [RFC] More robust migration

[Avi Kivity]

Jamie Lokier wrote:
> Paul Brook wrote:
>   
> > I never said you need the same host. All the save/restore code
> > should be host independent. It should be possible to save state on
> > (say) i386 and restore on ppc64. Anything that prevents this is IMO
> > a bug.
> >
> > For KVM you're likely to need a cpu with at least as many features
> > as the old one, but that's the price you pay for using host hardware
> > features.
> >     
>
> I'd prefer the "host hardware features" to be an acceleration
> mechanism, than something which makes a VM dependent on the specific
> host it's running on.
>
> Can't KVM invoke QEMU's emulation capabilities for those things it
> cannot provide itself because of missing host abilities?

Some host hardware features are invisible to the guest (so they are just 
acceleration mechanisms).  Others are visible to the guest (like 
instruction set extensions) but they can be turned off using cpuid so 
that mixed-feature migration pools are possible.

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