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Date: Wed, 29 Aug 2012 07:03:34 -0300
From: Marcelo Tosatti <mtosatti@redhat.com>
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Subject: Re: [Qemu-devel] [PATCHv4 3/4] cpuid: disable pv eoi for 1.1 and
 older compat types
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To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: gleb@redhat.com, kvm@vger.kernel.org, qemu-devel@nongnu.org, Blue Swirl <blauwirbel@gmail.com>, Jan Kiszka <jan.kiszka@web.de>, avi@redhat.com, Anthony Liguori <anthony@codemonkey.ws>, Eduardo Habkost <ehabkost@redhat.com>

On Wed, Aug 29, 2012 at 06:59:03AM -0300, Marcelo Tosatti wrote:
> > I don't understand. What is the problem with the proposal?
> > What will not work with our protocol?
> > Can you give an example please?
> > 
> > 
> > > > Too late for 1.2?
> > > 
> > > Absolutely (in my opinion).
> 
> My concern here is that you are introducing infrastructure by using
> _one example_, claiming it to solve a general problem, without the
> appropriate amount of energy spent in this solution.
> 
> Using old machines is supposed to be supported on older guests.
> 
> Michael, not migrating the PVEOI MSR actually crashes the guest?

Which is irrelevant since it won't be able to migrate to an older 
qemu.