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spapr: Error out when CPU hotplug is attempted on older pseries machines 

CPU hotplug and coldplug aren't supported prior to pseries-2.7.  Further,
earlier machine types don't use CPU core objects at all.  These mean that
query-hotpluggable-cpus and coldplug on older pseries machines will crash
QEMU.  It also means that hotpluggable_cpus flag in query-machines will
be incorrectly set to true for pseries < 2.7, since it is based on the
presence of the query_hotpluggable_cpus hook.

- Don't assign the query_hotpluggable_cpus hook for pseries < 2.7
- query_hotpluggable_cpus should therefore never be called on pseries <
  2.7, so add an assert
- spapr_core_pre_plug() should fail hot/cold plug attempts for pseries <
  2.7, since core objects are never used there
- spapr_core_plug() should therefore never be called for pseries < 2.7, so
  add an assert.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
[dwg: Change from query_hotpluggable_cpus returning NULL for pseries < 2.7
 to not being called at all, reword commit message for accuracy]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Bharata B Rao 2016-08-03 13:08:23 +10:00 committed by David Gibson
parent 8b54a6a6c6
commit c8721d3599
2 changed files with 12 additions and 14 deletions
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7
hw/ppc/spapr.c
View File

@ -2376,8 +2376,11 @@ static HotpluggableCPUList *spapr_query_hotpluggable_cpus(MachineState *machine)
int i;
HotpluggableCPUList *head = NULL;
sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(machine);
int spapr_max_cores = max_cpus / smp_threads;
g_assert(smc->dr_cpu_enabled);
for (i = 0; i < spapr_max_cores; i++) {
HotpluggableCPUList *list_item = g_new0(typeof(*list_item), 1);
HotpluggableCPU *cpu_item = g_new0(typeof(*cpu_item), 1);
@ -2432,7 +2435,9 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
hc->plug = spapr_machine_device_plug;
hc->unplug = spapr_machine_device_unplug;
mc->cpu_index_to_socket_id = spapr_cpu_index_to_socket_id;
mc->query_hotpluggable_cpus = spapr_query_hotpluggable_cpus;
if (smc->dr_cpu_enabled) {
mc->query_hotpluggable_cpus = spapr_query_hotpluggable_cpus;
}
smc->dr_lmb_enabled = true;
smc->dr_cpu_enabled = true;

19
hw/ppc/spapr_cpu_core.c
View File

@ -166,18 +166,11 @@ void spapr_core_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
int index = cc->core_id / smp_threads;
int smt = kvmppc_smt_threads();
g_assert(smc->dr_cpu_enabled);
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, index * smt);
spapr->cores[index] = OBJECT(dev);
if (!smc->dr_cpu_enabled) {
/*
* This is a cold plugged CPU core but the machine doesn't support
* DR. So skip the hotplug path ensuring that the core is brought
* up online with out an associated DR connector.
*/
return;
}
g_assert(drc);
/*
@ -225,13 +218,13 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
char *base_core_type = spapr_get_cpu_core_type(machine->cpu_model);
const char *type = object_get_typename(OBJECT(dev));
if (strcmp(base_core_type, type)) {
error_setg(&local_err, "CPU core type should be %s", base_core_type);
if (!smc->dr_cpu_enabled) {
error_setg(&local_err, "CPU hotplug not supported for this machine");
goto out;
}
if (!smc->dr_cpu_enabled && dev->hotplugged) {
error_setg(&local_err, "CPU hotplug not supported for this machine");
if (strcmp(base_core_type, type)) {
error_setg(&local_err, "CPU core type should be %s", base_core_type);
goto out;
}