Re: [Qemu-devel] [PATCH] Save/load PC speaker internal state (v2)

[Jan Kiszka]

On 2012-08-28 08:58, Pavel Dovgaluk wrote:
> Save PC speaker state to remove differences between system
> states after saving the snapshot and after loading it again.
> This patch is needed for deterministic replay of the execution.
> 
> v2: Do not save the data that cannot affect the guest code behavior.
> 
> Signed-off-by: Pavel Dovgalyuk<address@hidden>
> ---
>  hw/pcspk.c |   17 +++++++++++++++--
>  1 files changed, 15 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pcspk.c b/hw/pcspk.c
> index e430324..07a3de0 100644
> --- a/hw/pcspk.c
> +++ b/hw/pcspk.c
> @@ -46,8 +46,8 @@ 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";
> @@ -159,6 +159,18 @@ 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),

Just to understand the plan: The intention is to leave the audio
disabled after resume, just saving those bits that can be read back via
IO port, correct? Then please document this in a comment, otherwise fix it.

Jan

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