[Qemu-ppc] [PULL 01/14] spapr: fix core unplug crash

[David Gibson]

From: Greg Kurz <address@hidden>

If the host has 8 threads/core and the guest is started with:

-smp cores=1,threads=4,maxcpus=12

It is possible to crash QEMU by doing:

(qemu) device_add host-spapr-cpu-core,core-id=16,id=foo
(qemu) device_del foo
Segmentation fault

This happens because spapr_core_unplug() assumes cpu_dt_id == core_id.
As long as cpu_dt_id is derived from the non-table cpu_index, this is
only true when you plug cores with contiguous ids.

It is safer to be consistent: the DR connector was created with an
index that is immediately written to cc->core_id, and spapr_core_plug()
also relies on cc->core_id.

Let's use it also in spapr_core_unplug().

Signed-off-by: Greg Kurz <address@hidden>
Reviewed-by: Bharata B Rao <address@hidden>
Signed-off-by: David Gibson <address@hidden>
---
 hw/ppc/spapr_cpu_core.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index 9347f07..bc52b3c 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -126,11 +126,9 @@ static void spapr_core_release(DeviceState *dev, void 
*opaque)
 void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
                        Error **errp)
 {
-    sPAPRCPUCore *core = SPAPR_CPU_CORE(OBJECT(dev));
-    PowerPCCPU *cpu = POWERPC_CPU(core->threads);
-    int id = ppc_get_vcpu_dt_id(cpu);
+    CPUCore *cc = CPU_CORE(dev);
     sPAPRDRConnector *drc =
-        spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, id);
+        spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, cc->core_id);
     sPAPRDRConnectorClass *drck;
     Error *local_err = NULL;
 
-- 
2.7.4