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Re: [libvirt] [PATCH 4/4] qemu: default to kvm32/kvm64 when KVM is enabled



On Mon, Jan 23, 2012 at 04:57:21PM +0100, Jiri Denemark wrote:
> On Mon, Jan 23, 2012 at 14:11:11 +0100, Paolo Bonzini wrote:
> > The qemu32/qemu64 models are weird in that the exact combination of
> > CPUID flags does not match any actual processor.  kvm32 and kvm64 are
> > a better match when not using TCG.  Use them when -cpu is only needed
> > to hardcode a 32-bit guest arch or for kvmclock.
> 
> I don't think we can do this as it means the guest CPU may change unexpectedly
> for existing domains. A 32b domain started on current libvirt would see qemu32,
> while the same domain started after this patch would see kvm32.

Also, IIUC,  kvm32 is a fairly newly introduced CPU type for KVM - ie most
deployments of KVM won't support it.

Daniel
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