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Re: [Qemu-ppc] [PATCH v2 02/19] spapr: introduce a skeleton for the XIVE

From: Benjamin Herrenschmidt
Subject: Re: [Qemu-ppc] [PATCH v2 02/19] spapr: introduce a skeleton for the XIVE interrupt controller
Date: Thu, 18 Jan 2018 08:27:52 +1100

On Wed, 2018-01-17 at 15:39 +0100, Cédric Le Goater wrote:
> Migration is a problem. We will need both backend QEMU objects to be 
> available anyhow if we want to migrate. So we are back to the current 
> solution creating both QEMU objects but we can try to defer some of the 
> KVM inits and create the KVM device on demand at CAS time.

Do we have a way to migrate a piece of info from the machine *first*
that indicate what type of XICS/XIVE to instanciate ?

> The next problem is the ICP object that currently needs the KVM device 
> fd to connect the vcpus ... So, we will need to change that also. 
> That is probably the biggest problem today. We need a way to disconnect 
> the vpcu from the KVM device and see how we can defer the connection.
> I need to make sure this is possible, I can check that without XIVE


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