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[Qemu-devel] [PATCH for-2.10 04/23] hw/arm/virt: explicitly allocate cpu

From: Igor Mammedov
Subject: [Qemu-devel] [PATCH for-2.10 04/23] hw/arm/virt: explicitly allocate cpu_index for cpus
Date: Wed, 22 Mar 2017 14:32:29 +0100

Currently cpu_index is implicitly auto assigned during
cpu.realize() time cpu_exec_realizefn()->cpu_list_add().

It happens to match index in possible_cpus so take
control over it and make board initialize cpu_index
to possible_cpus index explicitly. It will at least
document that board is in control of it and when
'-device cpu' support comes it will keep cpu_index
stable regardless of order cpus are created so it won't
break migration.
Within this series it will be used for internal
conversion from storing cpu_index based NUMA node
bitmaps to property based mapping with possible_cpus,
And will allow map cpu_index to a CPU entry in
possible_cpus array.

Signed-off-by: Igor Mammedov <address@hidden>
 hw/arm/virt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/arm/virt.c b/hw/arm/virt.c
index 4de46b1..0cbcbc1 100644
--- a/hw/arm/virt.c
+++ b/hw/arm/virt.c
@@ -1364,6 +1364,7 @@ static void machvirt_init(MachineState *machine)
     for (n = 0; n < machine->possible_cpus->len; n++) {
         Object *cpuobj;
+        CPUState *cs;
         if (n >= smp_cpus) {
@@ -1373,6 +1374,9 @@ static void machvirt_init(MachineState *machine)
                                 "mp-affinity", NULL);
+        cs = CPU(cpuobj);
+        cs->cpu_index = n;
         if (!vms->secure) {
             object_property_set_bool(cpuobj, false, "has_el3", NULL);

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