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Re: [Qemu-devel] [PATCH] hw/sparc/sun4m: Fix problems with device intros


From: Mark Cave-Ayland
Subject: Re: [Qemu-devel] [PATCH] hw/sparc/sun4m: Fix problems with device introspection
Date: Fri, 6 Apr 2018 15:42:32 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0

On 05/04/18 11:43, Thomas Huth wrote:
Several devices of the sun4m machines are using &error_fatal in
their instance_init function and thus can cause QEMU to abort
unexpectedly:

$ echo "{'execute':'qmp_capabilities'}"\
        "{'execute':'device-list-properties',"\
        " 'arguments':{'typename':'openprom'}}" \
        | sparc-softmmu/qemu-system-sparc -M SS-10 -S -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
  "package": "build-all"}, "capabilities": []}}
{"return": {}}
RAMBlock "sun4m.prom" already registered, abort!
Aborted (core dumped)

$ echo "{'execute':'qmp_capabilities'}"\
        "{'execute':'device-list-properties',"\
        " 'arguments':{'typename':'macio_idreg'}}" \
        | sparc-softmmu/qemu-system-sparc -M SS-10 -S -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
  "package": "build-all"}, "capabilities": []}}
{"return": {}}
RAMBlock "sun4m.idreg" already registered, abort!
Aborted (core dumped)

$ echo "{'execute':'qmp_capabilities'}"\
        "{'execute':'device-list-properties',"\
        " 'arguments':{'typename':'tcx_afx'}}" \
        | sparc-softmmu/qemu-system-sparc -M SS-5 -S -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
  "package": "build-all"}, "capabilities": []}}
{"return": {}}
RAMBlock "sun4m.afx" already registered, abort!
Aborted (core dumped)

Fix the issues by converting the instance_init functions into realize()
functions instead, which are allowed to fail (and not called during
device introspection).

Signed-off-by: Thomas Huth <address@hidden>
---
  hw/sparc/sun4m.c | 67 ++++++++++++++++++++++++++++++++++++++++++--------------
  1 file changed, 50 insertions(+), 17 deletions(-)

diff --git a/hw/sparc/sun4m.c b/hw/sparc/sun4m.c
index 6471aca..8254ec3 100644
--- a/hw/sparc/sun4m.c
+++ b/hw/sparc/sun4m.c
@@ -572,23 +572,36 @@ typedef struct IDRegState {
      MemoryRegion mem;
  } IDRegState;
-static void idreg_init1(Object *obj)
+static void idreg_realize(DeviceState *ds, Error **errp)
  {
-    IDRegState *s = MACIO_ID_REGISTER(obj);
-    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
+    IDRegState *s = MACIO_ID_REGISTER(ds);
+    SysBusDevice *dev = SYS_BUS_DEVICE(ds);
+    Error *local_err = NULL;
+
+    memory_region_init_ram_nomigrate(&s->mem, OBJECT(ds), "sun4m.idreg",
+                                     sizeof(idreg_data), &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
- memory_region_init_ram_nomigrate(&s->mem, obj,
-                           "sun4m.idreg", sizeof(idreg_data), &error_fatal);
      vmstate_register_ram_global(&s->mem);
      memory_region_set_readonly(&s->mem, true);
      sysbus_init_mmio(dev, &s->mem);
  }
+static void idreg_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = idreg_realize;
+}
+
  static const TypeInfo idreg_info = {
      .name          = TYPE_MACIO_ID_REGISTER,
      .parent        = TYPE_SYS_BUS_DEVICE,
      .instance_size = sizeof(IDRegState),
-    .instance_init = idreg_init1,
+    .class_init    = idreg_class_init,
  };
#define TYPE_TCX_AFX "tcx_afx"
@@ -613,21 +626,35 @@ static void afx_init(hwaddr addr)
      sysbus_mmio_map(s, 0, addr);
  }
-static void afx_init1(Object *obj)
+static void afx_realize(DeviceState *ds, Error **errp)
  {
-    AFXState *s = TCX_AFX(obj);
-    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
+    AFXState *s = TCX_AFX(ds);
+    SysBusDevice *dev = SYS_BUS_DEVICE(ds);
+    Error *local_err = NULL;
+
+    memory_region_init_ram_nomigrate(&s->mem, OBJECT(ds), "sun4m.afx", 4,
+                                     &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
- memory_region_init_ram_nomigrate(&s->mem, obj, "sun4m.afx", 4, &error_fatal);
      vmstate_register_ram_global(&s->mem);
      sysbus_init_mmio(dev, &s->mem);
  }
+static void afx_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    dc->realize = afx_realize;
+}
+
  static const TypeInfo afx_info = {
      .name          = TYPE_TCX_AFX,
      .parent        = TYPE_SYS_BUS_DEVICE,
      .instance_size = sizeof(AFXState),
-    .instance_init = afx_init1,
+    .class_init    = afx_class_init,
  };
#define TYPE_OPENPROM "openprom"
@@ -680,13 +707,19 @@ static void prom_init(hwaddr addr, const char *bios_name)
      }
  }
-static void prom_init1(Object *obj)
+static void prom_realize(DeviceState *ds, Error **errp)
  {
-    PROMState *s = OPENPROM(obj);
-    SysBusDevice *dev = SYS_BUS_DEVICE(obj);
+    PROMState *s = OPENPROM(ds);
+    SysBusDevice *dev = SYS_BUS_DEVICE(ds);
+    Error *local_err = NULL;
+
+    memory_region_init_ram_nomigrate(&s->prom, OBJECT(ds), "sun4m.prom",
+                                     PROM_SIZE_MAX, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
- memory_region_init_ram_nomigrate(&s->prom, obj, "sun4m.prom", PROM_SIZE_MAX,
-                           &error_fatal);
      vmstate_register_ram_global(&s->prom);
      memory_region_set_readonly(&s->prom, true);
      sysbus_init_mmio(dev, &s->prom);
@@ -701,6 +734,7 @@ static void prom_class_init(ObjectClass *klass, void *data)
      DeviceClass *dc = DEVICE_CLASS(klass);
dc->props = prom_properties;
+    dc->realize = prom_realize;
  }
static const TypeInfo prom_info = {
@@ -708,7 +742,6 @@ static const TypeInfo prom_info = {
      .parent        = TYPE_SYS_BUS_DEVICE,
      .instance_size = sizeof(PROMState),
      .class_init    = prom_class_init,
-    .instance_init = prom_init1,
  };
#define TYPE_SUN4M_MEMORY "memory"

Reviewed-by: Mark Cave-Ayland <address@hidden>


ATB,

Mark.



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