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Re: [Qemu-ppc] [RFC PATCH] spapr: support time base offset migration

From: Alexander Graf
Subject: Re: [Qemu-ppc] [RFC PATCH] spapr: support time base offset migration
Date: Mon, 9 Sep 2013 11:32:01 +0200

On 09.09.2013, at 11:29, Benjamin Herrenschmidt wrote:

> On Mon, 2013-09-09 at 08:06 +0200, Alexander Graf wrote:
>> I think it's ok to restrict live migration to machines with the same
>> tb frequency when kvm is enabled. Whether you implement it through a
>> hardcoded 512Mhz or through a timebase value that gets live migrated
>> and then compared is up to you - both ways work for me :).
> The latter might be handy if we want to support migration on 970, though
> we don't have the TBU40 stuff there so adjusting the TB in the host
> kernel would be ... problematic.

Well, we could save/restore TB when we enter/exit the guest, no? But I really 
only want to have something that doesn't block the door for someone who wants 
to enable things.


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