Re: [Qemu-devel] [RFC PATCH 00/26] guest exploitation of the XIVE interrupt controller (POWER9)

[David Gibson <david@gibson.dropbear.id.au>]

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On Wed, Jul 05, 2017 at 07:13:13PM +0200, Cédric Le Goater wrote:
> On a POWER9 sPAPR machine, the Client Architecture Support (CAS)
> negotiation process determines whether the guest operates with an
> interrupt controller using the XICS legacy model, as found on POWER8,
> or in XIVE exploitation mode, the newer POWER9 interrupt model. This
> patchset is a first proposal to add XIVE support in the sPAPR machine.
> 
> The first patches introduce the XIVE exploitation mode in CAS.
> 
> Follow models for the XIVE interrupt controller, source and presenter.
> We try to reuse the ICS and ICP models of XICS because the sPAPR
> machine is tied to the XICSFabric interface and should be using a
> common framework to be able to switch from one controller model to
> another. To be discussed of course.
> 
> Then comes support for the Hypervisor's call which are used to
> configure the interrupt sources and the event/notification queues of
> the guest.
> 
> Finally, the last patches try to integrate the XIVE interrupt model in
> the sPAPR machine and this not without a couple of serious hacks to
> have something to test. See 'Caveats' below for more details.
> 
> This is a first draft and I expect a lot of rewrite before it reaches
> mainline QEMU. Nevertheless, it compiles, boots and can be used for
> some testing.

So, this is probably obvious, but I'm not considering this a candidate
for qemu 2.10 (seeing as the soft freeze was yesterday).  I'll still
try to review and, once ready, queue for 2.11.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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