Re: [Qemu-devel] [PATCH v2 02/12] pcspk: adding vmstate for save/restore

[Paolo Bonzini <pbonzini@redhat.com>]

Il 28/08/2014 13:18, Pavel Dovgalyuk ha scritto:
> VMState added by this patch preserves correct
> loading of the PC speaker device state.
> 
> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
> ---
>  hw/audio/pcspk.c |   17 +++++++++++++++--
>  1 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/audio/pcspk.c b/hw/audio/pcspk.c
> index 1d81bbe..1d58ef0 100644
> --- a/hw/audio/pcspk.c
> +++ b/hw/audio/pcspk.c
> @@ -50,8 +50,8 @@ typedef struct {
>      unsigned int pit_count;
>      unsigned int samples;
>      unsigned int play_pos;
> -    int data_on;
> -    int dummy_refresh_clock;
> +    uint8_t data_on;
> +    uint8_t dummy_refresh_clock;
>  } PCSpkState;
>  
>  static const char *s_spk = "pcspk";
> @@ -163,6 +163,18 @@ static const MemoryRegionOps pcspk_io_ops = {
>      },
>  };
>  
> +static const VMStateDescription vmstate_spk = {
> +    .name = "pcspk",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .minimum_version_id_old = 1,
> +    .fields      = (VMStateField[]) {
> +        VMSTATE_UINT8(data_on, PCSpkState),
> +        VMSTATE_UINT8(dummy_refresh_clock, PCSpkState),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>  static void pcspk_initfn(Object *obj)
>  {
>      PCSpkState *s = PC_SPEAKER(obj);
> @@ -192,6 +204,7 @@ static void pcspk_class_initfn(ObjectClass *klass, void *data)
>  
>      dc->realize = pcspk_realizefn;
>      set_bit(DEVICE_CATEGORY_SOUND, dc->categories);
> +    dc->vmsd = &vmstate_spk;
>      dc->props = pcspk_properties;
>      /* Reason: pointer property "pit", realize sets global pcspk_state */
>      dc->cannot_instantiate_with_device_add_yet = true;
> 

This breaks migration to 2.1 and earlier.  Not a big deal, just a heads
up for distributions.

Paolo