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Re: [Qemu-devel] [PATCH v7 01/16] hw/cpu: introduce CPU clusters

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v7 01/16] hw/cpu: introduce CPU clusters
Date: Mon, 3 Dec 2018 11:23:56 +0000

On Mon, 3 Dec 2018 at 11:21, Luc Michel <address@hidden> wrote:
> On 11/30/18 5:52 PM, Peter Maydell wrote:
> > Luc: what are the requirements on boards using CPU cluster
> > objects? I assume these are both OK:
> >  * does not use cluster objects at all
> >    (the gdbstub puts all the CPUs in one process?)
> Yes, when no clusters are found, a process with PID 1 is created and
> used for all CPUs.
> >  * all CPUs created are in some CPU cluster
> >    (the gdbstub uses one process per CPU cluster)
> > but what about
> >  * some CPUs are created in a CPU cluster, but some
> >    are "loose", not in any cluster at all> ?
> > Is that just invalid, or do the "loose" CPUs end up in
> > a default cluster (gdbstub process), or do they get
> > one cluster each?
> Currently this is valid and the "loose" CPUs end up in the first
> available process (which will be PID 1 if we are in your first case,
> i.e. no clusters in the machine).

So if there are some defined clusters 1 and 2, and some
loose CPUs, the clusters get PID 1 and PID 2, and the
loose CPUs end up in PID 3? That seems reasonable.

-- PMM

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