From: Thomas Huth <thuth@redhat.com>

QEMU currently crashes when introspecting the sun4u-iommu device from the
command line interface:

 $ ./qemu-system-sparc64 -display none -device sun4u-iommu,help
 qemu-system-sparc64: ../../devel/qemu/system/physmem.c:1401:
  register_multipage: Assertion `num_pages' failed.
 Aborted (core dumped)

There does not seem to be a compelling reason for initializing the
memory regions from the instance_init function, so let's simply move
the code into a realize() function instead to fix this issue.

Reported-by: Markus Armbruster <armbru@redhat.com>
Tested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20260317085839.445178-1-thuth@redhat.com>
---
 hw/sparc64/sun4u_iommu.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/hw/sparc64/sun4u_iommu.c b/hw/sparc64/sun4u_iommu.c
index 0188ce35d29..fe9d47b822f 100644
--- a/hw/sparc64/sun4u_iommu.c
+++ b/hw/sparc64/sun4u_iommu.c
@@ -290,13 +290,14 @@ static void iommu_reset(DeviceState *d)
     memset(s->regs, 0, IOMMU_NREGS * sizeof(uint64_t));
 }
 
-static void iommu_init(Object *obj)
+static void iommu_realize(DeviceState *ds, Error **errp)
 {
-    IOMMUState *s = SUN4U_IOMMU(obj);
-    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+    IOMMUState *s = SUN4U_IOMMU(ds);
+    SysBusDevice *sbd = SYS_BUS_DEVICE(ds);
+    Object *obj = OBJECT(ds);
 
     memory_region_init_iommu(&s->iommu, sizeof(s->iommu),
-                             TYPE_SUN4U_IOMMU_MEMORY_REGION, OBJECT(s),
+                             TYPE_SUN4U_IOMMU_MEMORY_REGION, obj,
                              "iommu-sun4u", UINT64_MAX);
     address_space_init(&s->iommu_as, MEMORY_REGION(&s->iommu), "iommu-as");
 
@@ -310,13 +311,13 @@ static void iommu_class_init(ObjectClass *klass, const void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     device_class_set_legacy_reset(dc, iommu_reset);
+    dc->realize = iommu_realize;
 }
 
 static const TypeInfo iommu_info = {
     .name          = TYPE_SUN4U_IOMMU,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(IOMMUState),
-    .instance_init = iommu_init,
     .class_init    = iommu_class_init,
 };
 
-- 
2.53.0