Trying to add a spapr-nvram device currently aborts QEMU like this:

$ ppc64-softmmu/qemu-system-ppc64  -device spapr-nvram
qemu-system-ppc64: hw/ppc/spapr_rtas.c:407: spapr_rtas_register:
 Assertion `!rtas_table[token].name' failed.
Aborted (core dumped)

This NVRAM device registers RTAS calls during its realize function
and thus can only be used once - and that's internally from spapr.c.
So let's mark the device with user_creatable = false to avoid that
the users can crash their QEMU this way.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 hw/nvram/spapr_nvram.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c
index bc355a4..4a0aec8 100644
--- a/hw/nvram/spapr_nvram.c
+++ b/hw/nvram/spapr_nvram.c
@@ -264,6 +264,8 @@ static void spapr_nvram_class_init(ObjectClass *klass, void *data)
     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
     dc->props = spapr_nvram_properties;
     dc->vmsd = &vmstate_spapr_nvram;
+    /* Reason: Internal device only, uses spapr_rtas_register() in realize() */
+    dc->user_creatable = false;
 }
 
 static const TypeInfo spapr_nvram_type_info = {
-- 
1.8.3.1

On Thu, Aug 24, 2017 at 09:41:33AM +0200, Thomas Huth wrote:
> Trying to add a spapr-nvram device currently aborts QEMU like this:
> 
> $ ppc64-softmmu/qemu-system-ppc64  -device spapr-nvram
> qemu-system-ppc64: hw/ppc/spapr_rtas.c:407: spapr_rtas_register:
>  Assertion `!rtas_table[token].name' failed.
> Aborted (core dumped)
> 
> This NVRAM device registers RTAS calls during its realize function
> and thus can only be used once - and that's internally from spapr.c.
> So let's mark the device with user_creatable = false to avoid that
> the users can crash their QEMU this way.
> 
> Signed-off-by: Thomas Huth <thuth@redhat.com>

Applied to ppc-for-2.11, thanks.

> ---
>  hw/nvram/spapr_nvram.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c
> index bc355a4..4a0aec8 100644
> --- a/hw/nvram/spapr_nvram.c
> +++ b/hw/nvram/spapr_nvram.c
> @@ -264,6 +264,8 @@ static void spapr_nvram_class_init(ObjectClass *klass, void *data)
>      set_bit(DEVICE_CATEGORY_MISC, dc->categories);
>      dc->props = spapr_nvram_properties;
>      dc->vmsd = &vmstate_spapr_nvram;
> +    /* Reason: Internal device only, uses spapr_rtas_register() in realize() */
> +    dc->user_creatable = false;
>  }
>  
>  static const TypeInfo spapr_nvram_type_info = {

-- 
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david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson