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Re: [Qemu-devel] [PATCH for-2.10] hw/display/sm501: Don't use vmstate_re


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH for-2.10] hw/display/sm501: Don't use vmstate_register_ram_global()
Date: Mon, 24 Jul 2017 11:28:57 +0100

Ping for review, please? Would be nice to get this into rc0.

thanks
-- PMM

On 17 July 2017 at 17:37, Peter Maydell <address@hidden> wrote:
> The sm501 device uses vmstate_register_ram_global() to register its
> memory region for migration.  This means it gets a name that is
> assumed to be global to the whole system, which in turn means that if
> you create two of the device we assert because of the duplication:
>
> qemu-system-ppc -device sm501 -device sm501
> RAMBlock "sm501.local" already registered, abort!
> Aborted (core dumped)
>
> Changing this to just use memory_region_init_ram()'s automatic
> registration of the memory region with a device-local name fixes
> this.  The downside is that it breaks migration compatibility, but
> luckily we only added migration support to this device in the 2.10
> release cycle so we haven't released a QEMU version with the broken
> implementation.
>
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> Recent refactoring that renamed the old "memory_region_init_ram"
> to memory_region_init_ram_nomigrate" made this bug a bit easier
> to find via grep...
>
>  hw/display/sm501.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/hw/display/sm501.c b/hw/display/sm501.c
> index af792c5..9aa515b 100644
> --- a/hw/display/sm501.c
> +++ b/hw/display/sm501.c
> @@ -1578,9 +1578,8 @@ static void sm501_init(SM501State *s, DeviceState *dev,
>                    s->local_mem_size_index);
>
>      /* local memory */
> -    memory_region_init_ram_nomigrate(&s->local_mem_region, OBJECT(dev), 
> "sm501.local",
> +    memory_region_init_ram(&s->local_mem_region, OBJECT(dev), "sm501.local",
>                             get_local_mem_size(s), &error_fatal);
> -    vmstate_register_ram_global(&s->local_mem_region);
>      memory_region_set_log(&s->local_mem_region, true, DIRTY_MEMORY_VGA);
>      s->local_mem = memory_region_get_ram_ptr(&s->local_mem_region);
>
> --P



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