Re: [Qemu-devel] [RFC PATCH v3 04/49] fdc: adding vmstate for save/restore

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Pavel Dovgalyuk (Pavel.Dovgaluk@ispras.ru) wrote:
> VMState added by this patch preserves correct
> loading of the FDC device state.

This is a pretty big series, but I suspect most people don't need
most of these devices, especially for replay/reverse execution stuff.
Why don't you boil this down to a much smaller basic set that's enough
to get replay/reverse execution stuff on a simple setup; and then once
people have got it going add more of the devices in.

(Even if reading about floppy perpendicular mode is kind of fun for a 
Friday afternoon).

Dave


> 
> Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
> ---
>  hw/block/fdc.c |   85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>  1 files changed, 83 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/block/fdc.c b/hw/block/fdc.c
> index 490d127..7305f75 100644
> --- a/hw/block/fdc.c
> +++ b/hw/block/fdc.c
> @@ -695,10 +695,34 @@ static const VMStateDescription vmstate_fdrive_media_rate = {
>      }
>  };
>  
> +static bool fdrive_perpendicular_needed(void *opaque)
> +{
> +    FDrive *drive = opaque;
> +
> +    return drive->perpendicular != 0;
> +}
> +
> +static const VMStateDescription vmstate_fdrive_perpendicular = {
> +    .name = "fdrive/perpendicular",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT8(perpendicular, FDrive),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static int fdrive_post_load(void *opaque, int version_id)
> +{
> +    fd_revalidate(opaque);
> +    return 0;
> +}
> +
>  static const VMStateDescription vmstate_fdrive = {
>      .name = "fdrive",
> -    .version_id = 1,
> +    .version_id = 2,
>      .minimum_version_id = 1,
> +    .post_load = fdrive_post_load,
>      .fields = (VMStateField[]) {
>          VMSTATE_UINT8(head, FDrive),
>          VMSTATE_UINT8(track, FDrive),
> @@ -713,6 +737,9 @@ static const VMStateDescription vmstate_fdrive = {
>              .vmsd = &vmstate_fdrive_media_rate,
>              .needed = &fdrive_media_rate_needed,
>          } , {
> +            .vmsd = &vmstate_fdrive_perpendicular,
> +            .needed = &fdrive_perpendicular_needed,
> +        } , {
>              /* empty */
>          }
>      }
> @@ -725,6 +752,14 @@ static void fdc_pre_save(void *opaque)
>      s->dor_vmstate = s->dor | GET_CUR_DRV(s);
>  }
>  
> +static int fdc_pre_load(void *opaque)
> +{
> +    FDCtrl *s = opaque;
> +    s->reset_sensei = 0;
> +    timer_del(s->result_timer);
> +    return 0;
> +}
> +
>  static int fdc_post_load(void *opaque, int version_id)
>  {
>      FDCtrl *s = opaque;
> @@ -734,11 +769,46 @@ static int fdc_post_load(void *opaque, int version_id)
>      return 0;
>  }
>  
> +static bool fdc_reset_sensei_needed(void *opaque)
> +{
> +    FDCtrl *s = opaque;
> +
> +    return s->reset_sensei != 0;
> +}
> +
> +static const VMStateDescription vmstate_fdc_reset_sensei = {
> +    .name = "fdc/reset_sensei",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_INT32(reset_sensei, FDCtrl),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
> +static bool fdc_result_timer_needed(void *opaque)
> +{
> +    FDCtrl *s = opaque;
> +
> +    return timer_pending(s->result_timer);
> +}
> +
> +static const VMStateDescription vmstate_fdc_result_timer = {
> +    .name = "fdc/result_timer",
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_TIMER(result_timer, FDCtrl),
> +        VMSTATE_END_OF_LIST()
> +    }
> +};
> +
>  static const VMStateDescription vmstate_fdc = {
>      .name = "fdc",
> -    .version_id = 2,
> +    .version_id = 3,
>      .minimum_version_id = 2,
>      .pre_save = fdc_pre_save,
> +    .pre_load = fdc_pre_load,
>      .post_load = fdc_post_load,
>      .fields = (VMStateField[]) {
>          /* Controller State */
> @@ -770,6 +840,17 @@ static const VMStateDescription vmstate_fdc = {
>          VMSTATE_STRUCT_ARRAY(drives, FDCtrl, MAX_FD, 1,
>                               vmstate_fdrive, FDrive),
>          VMSTATE_END_OF_LIST()
> +    },
> +    .subsections = (VMStateSubsection[]) {
> +        {
> +            .vmsd = &vmstate_fdc_reset_sensei,
> +            .needed = fdc_reset_sensei_needed,
> +        } , {
> +            .vmsd = &vmstate_fdc_result_timer,
> +            .needed = fdc_result_timer_needed,
> +        } , {
> +            /* empty */
> +        }
>      }
>  };
>  
> 
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK