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Re: [Qemu-devel] [RFC][PATCH 14/16] kvm: x86: Add user space part for in

From: Jan Kiszka
Subject: Re: [Qemu-devel] [RFC][PATCH 14/16] kvm: x86: Add user space part for in-kernel i8259
Date: Mon, 05 Dec 2011 12:37:37 +0100
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On 2011-12-05 11:01, Avi Kivity wrote:
> On 12/04/2011 11:38 PM, Jan Kiszka wrote:
>>> It should be also possible to migrate from non-KVM device to KVM
>>> version, different names would prevent that for ever.
>> It is (theoretically) possible with these patches as the vmstate names
>> are the same. KVM to TCG migration does not work right now, so I was
>> only able to test in-kernel <-> user space irqchip model migrations.
> btw, for the next-gen migration protocol, we'd probably be using QOM
> paths, not vmstate names; the QOM paths would include the device name?

That would be a very bad idea IMHO. Every refactoring of your device
tree, e.g. to model CPU hotplug and the ICC bus more accurately, would
risk to create a migration crack. At least we would need some stable
naming and/or alias concept then.


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