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[Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize

Thomas Huth posted 1 patch 6 years ago
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hw/sparc64/sun4u.c | 18 ++++++++++++------
1 file changed, 12 insertions(+), 6 deletions(-)
[Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Thomas Huth 6 years ago 
The instance_init function of devices should always succeed to be able
to introspect the device. However, the instance_init function of the
"openprom" device can currently fail, for example like this:

$ echo "{'execute':'qmp_capabilities'}"\
       "{'execute':'device-list-properties',"\
       " 'arguments':{'typename':'openprom'}}" \
       | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
{"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
 "package": "build-all"}, "capabilities": []}}
{"return": {}}
RAMBlock "sun4u.prom" already registered, abort!
Aborted (core dumped)

This should not happen. Fix this problem by moving the affected code from
instance_init into a realize function instead.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 hw/sparc64/sun4u.c | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
index 2044a52..d62f5a2 100644
--- a/hw/sparc64/sun4u.c
+++ b/hw/sparc64/sun4u.c
@@ -425,13 +425,19 @@ 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), "sun4u.prom",
+                                     PROM_SIZE_MAX, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
+        return;
+    }
 
-    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.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);
@@ -446,6 +452,7 @@ 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 = {
@@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(PROMState),
     .class_init    = prom_class_init,
-    .instance_init = prom_init1,
 };
 
 
-- 
1.8.3.1
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Philippe Mathieu-Daudé 6 years ago 
On 04/05/2018 06:32 AM, Thomas Huth wrote:
> The instance_init function of devices should always succeed to be able
> to introspect the device. However, the instance_init function of the
> "openprom" device can currently fail, for example like this:
> 
> $ echo "{'execute':'qmp_capabilities'}"\
>        "{'execute':'device-list-properties',"\
>        " 'arguments':{'typename':'openprom'}}" \
>        | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>  "package": "build-all"}, "capabilities": []}}
> {"return": {}}
> RAMBlock "sun4u.prom" already registered, abort!
> Aborted (core dumped)
> 
> This should not happen. Fix this problem by moving the affected code from
> instance_init into a realize function instead.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  hw/sparc64/sun4u.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
> index 2044a52..d62f5a2 100644
> --- a/hw/sparc64/sun4u.c
> +++ b/hw/sparc64/sun4u.c
> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
> +                                     PROM_SIZE_MAX, &local_err);

This looks the memory_region_init_ram() pattern...

> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
>  
> -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.prom", PROM_SIZE_MAX,
> -                           &error_fatal);
>      vmstate_register_ram_global(&s->prom);

...    ^

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

>      memory_region_set_readonly(&s->prom, true);
>      sysbus_init_mmio(dev, &s->prom);
> @@ -446,6 +452,7 @@ 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 = {
> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>      .parent        = TYPE_SYS_BUS_DEVICE,
>      .instance_size = sizeof(PROMState),
>      .class_init    = prom_class_init,
> -    .instance_init = prom_init1,
>  };
>  
>  
>
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Philippe Mathieu-Daudé 6 years ago 
On 04/05/2018 01:22 PM, Philippe Mathieu-Daudé wrote:
> On 04/05/2018 06:32 AM, Thomas Huth wrote:
>> The instance_init function of devices should always succeed to be able
>> to introspect the device. However, the instance_init function of the
>> "openprom" device can currently fail, for example like this:
>>
>> $ echo "{'execute':'qmp_capabilities'}"\
>>        "{'execute':'device-list-properties',"\
>>        " 'arguments':{'typename':'openprom'}}" \
>>        | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
>> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>>  "package": "build-all"}, "capabilities": []}}
>> {"return": {}}
>> RAMBlock "sun4u.prom" already registered, abort!
>> Aborted (core dumped)
>>
>> This should not happen. Fix this problem by moving the affected code from
>> instance_init into a realize function instead.
>>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> ---
>>  hw/sparc64/sun4u.c | 18 ++++++++++++------
>>  1 file changed, 12 insertions(+), 6 deletions(-)
>>
>> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
>> index 2044a52..d62f5a2 100644
>> --- a/hw/sparc64/sun4u.c
>> +++ b/hw/sparc64/sun4u.c
>> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
>> +                                     PROM_SIZE_MAX, &local_err);
> 
> This looks the memory_region_init_ram() pattern...
> 
>> +    if (local_err) {
>> +        error_propagate(errp, local_err);
>> +        return;
>> +    }
>>  
>> -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.prom", PROM_SIZE_MAX,
>> -                           &error_fatal);
>>      vmstate_register_ram_global(&s->prom);
> 
> ...    ^
> 
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> 
>>      memory_region_set_readonly(&s->prom, true);

Maybe memory_region_init_rom_nomigrate() even?

>>      sysbus_init_mmio(dev, &s->prom);
>> @@ -446,6 +452,7 @@ 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 = {
>> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>>      .parent        = TYPE_SYS_BUS_DEVICE,
>>      .instance_size = sizeof(PROMState),
>>      .class_init    = prom_class_init,
>> -    .instance_init = prom_init1,
>>  };
>>  
>>  
>>
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Mark Cave-Ayland 6 years ago 
On 05/04/18 10:32, Thomas Huth wrote:

> The instance_init function of devices should always succeed to be able
> to introspect the device. However, the instance_init function of the
> "openprom" device can currently fail, for example like this:
> 
> $ echo "{'execute':'qmp_capabilities'}"\
>         "{'execute':'device-list-properties',"\
>         " 'arguments':{'typename':'openprom'}}" \
>         | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>   "package": "build-all"}, "capabilities": []}}
> {"return": {}}
> RAMBlock "sun4u.prom" already registered, abort!
> Aborted (core dumped)
> 
> This should not happen. Fix this problem by moving the affected code from
> instance_init into a realize function instead.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>   hw/sparc64/sun4u.c | 18 ++++++++++++------
>   1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
> index 2044a52..d62f5a2 100644
> --- a/hw/sparc64/sun4u.c
> +++ b/hw/sparc64/sun4u.c
> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
> +                                     PROM_SIZE_MAX, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
>   
> -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.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);
> @@ -446,6 +452,7 @@ 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 = {
> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>       .parent        = TYPE_SYS_BUS_DEVICE,
>       .instance_size = sizeof(PROMState),
>       .class_init    = prom_class_init,
> -    .instance_init = prom_init1,
>   };

Looks good to me:

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

I thought this would have been caught by the device introspect test, or 
is this something you've found whilst trying to add sun4v to the list of 
machines to include in the test?


ATB,

Mark.
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Thomas Huth 6 years ago 
On 06.04.2018 16:41, Mark Cave-Ayland wrote:
> On 05/04/18 10:32, Thomas Huth wrote:
> 
>> The instance_init function of devices should always succeed to be able
>> to introspect the device. However, the instance_init function of the
>> "openprom" device can currently fail, for example like this:
>>
>> $ echo "{'execute':'qmp_capabilities'}"\
>>         "{'execute':'device-list-properties',"\
>>         " 'arguments':{'typename':'openprom'}}" \
>>         | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest
>> -qmp stdio
>> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>>   "package": "build-all"}, "capabilities": []}}
>> {"return": {}}
>> RAMBlock "sun4u.prom" already registered, abort!
>> Aborted (core dumped)
>>
>> This should not happen. Fix this problem by moving the affected code from
>> instance_init into a realize function instead.
>>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> ---
>>   hw/sparc64/sun4u.c | 18 ++++++++++++------
>>   1 file changed, 12 insertions(+), 6 deletions(-)
>>
>> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
>> index 2044a52..d62f5a2 100644
>> --- a/hw/sparc64/sun4u.c
>> +++ b/hw/sparc64/sun4u.c
>> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
>> +                                     PROM_SIZE_MAX, &local_err);
>> +    if (local_err) {
>> +        error_propagate(errp, local_err);
>> +        return;
>> +    }
>>   -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.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);
>> @@ -446,6 +452,7 @@ 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 = {
>> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>>       .parent        = TYPE_SYS_BUS_DEVICE,
>>       .instance_size = sizeof(PROMState),
>>       .class_init    = prom_class_init,
>> -    .instance_init = prom_init1,
>>   };
> 
> Looks good to me:
> 
> Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> 
> I thought this would have been caught by the device introspect test, or
> is this something you've found whilst trying to add sun4v to the list of
> machines to include in the test?

I've found it with this patch here:

https://lists.gnu.org/archive/html/qemu-devel/2018-03/msg05033.html

The current device-introspect-test only checks with the "none" machine,
so it did not detect this problem yet since this only happens when you
use the sun4v machine.

 Thomas
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Thomas Huth 5 years, 10 months ago 
On 05.04.2018 11:32, Thomas Huth wrote:
> The instance_init function of devices should always succeed to be able
> to introspect the device. However, the instance_init function of the
> "openprom" device can currently fail, for example like this:
> 
> $ echo "{'execute':'qmp_capabilities'}"\
>        "{'execute':'device-list-properties',"\
>        " 'arguments':{'typename':'openprom'}}" \
>        | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>  "package": "build-all"}, "capabilities": []}}
> {"return": {}}
> RAMBlock "sun4u.prom" already registered, abort!
> Aborted (core dumped)
> 
> This should not happen. Fix this problem by moving the affected code from
> instance_init into a realize function instead.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>  hw/sparc64/sun4u.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
> index 2044a52..d62f5a2 100644
> --- a/hw/sparc64/sun4u.c
> +++ b/hw/sparc64/sun4u.c
> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
> +                                     PROM_SIZE_MAX, &local_err);
> +    if (local_err) {
> +        error_propagate(errp, local_err);
> +        return;
> +    }
>  
> -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.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);
> @@ -446,6 +452,7 @@ 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 = {
> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>      .parent        = TYPE_SYS_BUS_DEVICE,
>      .instance_size = sizeof(PROMState),
>      .class_init    = prom_class_init,
> -    .instance_init = prom_init1,
>  };

Ping!

 Thomas
Re: [Qemu-devel] [PATCH] hw/sparc64/sun4u: Fix introspection by converting prom instance_init to realize
Posted by Artyom Tarasenko 5 years, 10 months ago 
On Fri, Jun 15, 2018 at 7:16 AM, Thomas Huth <thuth@redhat.com> wrote:
> On 05.04.2018 11:32, Thomas Huth wrote:
>> The instance_init function of devices should always succeed to be able
>> to introspect the device. However, the instance_init function of the
>> "openprom" device can currently fail, for example like this:
>>
>> $ echo "{'execute':'qmp_capabilities'}"\
>>        "{'execute':'device-list-properties',"\
>>        " 'arguments':{'typename':'openprom'}}" \
>>        | sparc64-softmmu/qemu-system-sparc64 -M sun4v,accel=qtest -qmp stdio
>> {"QMP": {"version": {"qemu": {"micro": 91, "minor": 11, "major": 2},
>>  "package": "build-all"}, "capabilities": []}}
>> {"return": {}}
>> RAMBlock "sun4u.prom" already registered, abort!
>> Aborted (core dumped)
>>
>> This should not happen. Fix this problem by moving the affected code from
>> instance_init into a realize function instead.
>>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> ---
>>  hw/sparc64/sun4u.c | 18 ++++++++++++------
>>  1 file changed, 12 insertions(+), 6 deletions(-)
>>
>> diff --git a/hw/sparc64/sun4u.c b/hw/sparc64/sun4u.c
>> index 2044a52..d62f5a2 100644
>> --- a/hw/sparc64/sun4u.c
>> +++ b/hw/sparc64/sun4u.c
>> @@ -425,13 +425,19 @@ 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), "sun4u.prom",
>> +                                     PROM_SIZE_MAX, &local_err);
>> +    if (local_err) {
>> +        error_propagate(errp, local_err);
>> +        return;
>> +    }
>>
>> -    memory_region_init_ram_nomigrate(&s->prom, obj, "sun4u.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);
>> @@ -446,6 +452,7 @@ 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 = {
>> @@ -453,7 +460,6 @@ static const TypeInfo prom_info = {
>>      .parent        = TYPE_SYS_BUS_DEVICE,
>>      .instance_size = sizeof(PROMState),
>>      .class_init    = prom_class_init,
>> -    .instance_init = prom_init1,
>>  };
>
> Ping!

Acked-by: Artyom Tarasenko <atar4qemu@gmail.com>

Mark, can you please take this one too?

Artyom



-- 
Regards,
Artyom Tarasenko

SPARC and PPC PReP under qemu blog: http://tyom.blogspot.com/search/label/qemu

Patchew 2.1-devel-0870f84

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