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

Paolo Bonzini pbonzini at redhat.com
Mon Jan 23 16:23:32 UTC 2012


On 01/23/2012 05:03 PM, Daniel P. Berrange 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.

Ok, I'll redo this patch with just kvm64.  As the wrong subject in 0/3 
show, it was an afterthought.

As soon as I get the review of 3/4, I'll see whether I need to resubmit 
the whole series or just this patch.

Paolo




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