unicorn/qemu/qom
Peter Maydell d5298c5370
qom/cpu: Add cluster_index to CPUState
For TCG we want to distinguish which cluster a CPU is in, and
we need to do it quickly. Cache the cluster index in the CPUState
struct, by having the cluster object set cpu->cluster_index for
each CPU child when it is realized.

This means that board/SoC code must add all CPUs to the cluster
before realizing the cluster object. Regrettably QOM provides no
way to prevent adding children to a realized object and no way for
the parent to be notified when a new child is added to it, so
we don't have any way to enforce/assert this constraint; all
we can do is document it in a comment. We can at least put in a
check that the cluster contains at least one CPU, which should
catch the typical cases of "realized cluster too early" or
"forgot to parent the CPUs into it".

The restriction on how many clusters can exist in the system
is imposed by TCG code which will be added in a subsequent commit,
but the check to enforce it in cluster.c fits better in this one.

Backports relevant parts of commit 7ea7b9ad532e59c3efbcabff0e3484f4df06104c from qemu
2019-01-30 12:59:59 -05:00
..
container.c qom: Allow properties to be registered against classes 2018-02-21 21:00:56 -05:00
cpu.c qom/cpu: Add cluster_index to CPUState 2019-01-30 12:59:59 -05:00
Makefile.objs import 2015-08-21 15:04:50 +08:00
object.c qom/object: register 'type' property as class property 2018-10-08 14:14:45 -04:00
qom-qobject.c qapi: Drop unused non-strict qobject input visitor 2018-03-02 12:14:52 -05:00