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Date: Fri, 9 Oct 2009 11:06:41 +0100
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] Re: [PATCH v2 4/9] provide in-kernel apic
Message-ID: <20091009100641.GC6576@shareable.org>
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To: Glauber Costa <glommer@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>, Avi Kivity <avi@redhat.com>, kvm-devel <kvm@vger.kernel.org>, qemu-devel@nongnu.org

Glauber Costa wrote:
> > It ensures the two models are compatible.  Since they're the same device  
> > from the point of view of the guest, there's no reason for them to have  
> > different representations or to be incompatible.
> 
> live migration between something that has in-kernel irqchip and
> something that has not is likely to be a completely untested
> thing. And this is the only reason we might think of it as the same
> device. I don't see any value in supporting this combination

Not just live migration.  ACPI sleep + savevm + loadvm + ACPI resume,
for example.

-- Jamie