hw/ppc/spapr_cpu_core: Add a proper check for spapr machine

QEMU currently crashes when the user tries to add a spapr-cpu-core
on a non-pseries machine:

$ qemu-system-ppc64 -S -machine ppce500,accel=tcg \
                    -device POWER5+_v2.1-spapr-cpu-core
hw/ppc/spapr_cpu_core.c:178:spapr_cpu_core_realize_child:
Object 0x55cee1f55160 is not an instance of type spapr-machine
Aborted (core dumped)

So let's add a proper check for the correct machine time with
a more friendly error message here.

Reported-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

2 files changed, 8 insertions, 0 deletions

diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c
index ea278ce2a7..dd9232620d 100644
--- a/hw/ppc/spapr_cpu_core.c
+++ b/hw/ppc/spapr_cpu_core.c
@@ -220,6 +220,11 @@ static void spapr_cpu_core_realize(DeviceState *dev, Error **errp)
     void *obj;
     int i, j;
 
+    if (!object_dynamic_cast(qdev_get_machine(), TYPE_SPAPR_MACHINE)) {
+        error_setg(errp, "spapr-cpu-core needs a pseries machine");
+        return;
+    }
+
     sc->threads = g_malloc0(size * cc->nr_threads);
     for (i = 0; i < cc->nr_threads; i++) {
         char id[32];
diff --git a/scripts/device-crash-test b/scripts/device-crash-test
index 81d65b9617..043b24a4aa 100755
--- a/scripts/device-crash-test
+++ b/scripts/device-crash-test
@@ -160,6 +160,9 @@ ERROR_WHITELIST = [
     {'machine':'q35|pc.*', 'device':'kvm-ioapic', 'expected':True}, # Only 1 ioapics allowed
     {'machine':'q35|pc.*', 'device':'ioapic', 'expected':True},     # Only 1 ioapics allowed
 
+    # "spapr-cpu-core needs a pseries machine"
+    {'machine':'(?!pseries).*', 'device':'.*-spapr-cpu-core', 'expected':True},
+
     # KVM-specific devices shouldn't be tried without accel=kvm:
     {'accel':'(?!kvm).*', 'device':'kvmclock', 'expected':True},
     {'accel':'(?!kvm).*', 'device':'kvm-pci-assign', 'expected':True},