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Re: [Qemu-devel] [PATCH v2 02/19] spapr: introduce a skeleton for the XI
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From: |
Benjamin Herrenschmidt |
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Subject: |
Re: [Qemu-devel] [PATCH v2 02/19] spapr: introduce a skeleton for the XIVE interrupt controller |
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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
Ben.