Re: [PATCH] arm64/kvm: Add generic v8 KVM target

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> On Jun 26, 2015, at 2:53 AM, Christoffer Dall <christoffer.dall@xxxxxxxxxx> wrote:
> 
> On Thu, Jun 25, 2015 at 02:49:08PM +0100, Peter Maydell wrote:
>> On 25 June 2015 at 14:44, Marc Zyngier <marc.zyngier@xxxxxxx> wrote:
>>> It should always be possible to emulate a "known" CPU on a generic host,
>>> and it should be able to migrate. The case we can't migrate is when we
>>> let the guest be generic (which I guess should really be unknown, and
>>> not generic).
>>> 
>>> So if the user specify "-cpu cortex-a57" on the command line, the guest
>>> should be able to migrate from an A72 to an A53. if the user specified
>>> "-cpu host", the resulting guest won't be able to migrate.
>>> 
>>> Does it make sense?
>> 
>> Yes. We've always said "-cpu host" won't be cross-host migratable
>> from a QEMU point of view.
>> 
> ok, this makes sense.  It's basically up to userspace to mandate that
> trying to migrate something that used unknown cpu (via -cpu host or
> whatever) cannot be migrated.
> 

Will this also prevents migrating between same implementations, if no how is this identified.
This seems to be making emulation a requirment for ARM64 KVM. 


Thanks,
Tirumalesh. 
 

> -Christoffer
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