Re: [Xen-devel] [Qemu-devel] [PATCH v3 1/6] suspend: add infrastructure

[Gleb Natapov <gleb@xxxxxxxxxx>]

On Thu, Feb 09, 2012 at 01:02:47PM +0100, Gerd Hoffmann wrote:
> On 02/09/12 12:19, Gleb Natapov wrote:
> > On Thu, Feb 09, 2012 at 11:45:21AM +0100, Gerd Hoffmann wrote:
> >> On 02/09/12 09:48, Gleb Natapov wrote:
> >>> On Wed, Feb 08, 2012 at 12:00:14PM +0100, Gerd Hoffmann wrote:
> >>>>  * qemu_system_wakeup_request is supposed to be called on events which
> >>>>    should wake up the guest.
> >>>>
> >>> qemu_system_wakeup_request() should get wakeup source as a parameter.
> >>> There are ways to report it to a guest.
> >>
> >> Can we do that incrementally, when we actually implement the guest
> >> reporting?
> >>
> > What do you mean by "when we actually implement the guest
> > reporting"? The guest reporting is part of ACPI spec and implemented
> > by all relevant guests. I think that adding wakeup source parameter to
> > qemu_system_wakeup_request() and reporting RTC_STS and PWRBTN_STS should
> > not complicate your patch series to much. I agree that DSDT magic required
> > by other devices can wait for later.
> 
> Incremental patch (just infrastructure, no acpi windup yet) attached.
> Something like this?
> 
We need to give ACPI ability to prevent wakeup. So, for instance, if RTC
alarm calls wakeup but ACPI detects that RTC_EN is cleared it can
prevent it.

> cheers,
>   Gerd

> commit 78fbd17ddc98a2e96e05db62afbe3a69c5fad5e5
> Author: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> Date:   Thu Feb 9 12:52:48 2012 +0100
> 
>     reason: infra
> 
> diff --git a/sysemu.h b/sysemu.h
> index 3b9d7f5..e7060aa 100644
> --- a/sysemu.h
> +++ b/sysemu.h
> @@ -38,10 +38,16 @@ void vm_start(void);
>  void vm_stop(RunState state);
>  void vm_stop_force_state(RunState state);
>  
> +typedef enum WakeupReason {
> +    QEMU_WAKEUP_REASON_OTHER = 0,
> +    QEMU_WAKEUP_REASON_RTC,
> +} WakeupReason;
> +
>  void qemu_system_reset_request(void);
>  void qemu_system_suspend_request(void);
>  void qemu_register_suspend_notifier(Notifier *notifier);
> -void qemu_system_wakeup_request(void);
> +void qemu_system_wakeup_request(WakeupReason reason);
> +void qemu_register_wakeup_notifier(Notifier *notifier);
>  void qemu_system_shutdown_request(void);
>  void qemu_system_powerdown_request(void);
>  void qemu_system_debug_request(void);
> diff --git a/vl.c b/vl.c
> index 822fd58..17d4b72 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -1286,6 +1286,8 @@ static int debug_requested;
>  static bool is_suspended;
>  static NotifierList suspend_notifiers =
>      NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
> +static NotifierList wakeup_notifiers =
> +    NOTIFIER_LIST_INITIALIZER(wakeup_notifiers);
>  static RunState vmstop_requested = RUN_STATE_MAX;
>  
>  int qemu_shutdown_requested_get(void)
> @@ -1416,16 +1418,22 @@ void qemu_register_suspend_notifier(Notifier 
> *notifier)
>      notifier_list_add(&suspend_notifiers, notifier);
>  }
>  
> -void qemu_system_wakeup_request(void)
> +void qemu_system_wakeup_request(WakeupReason reason)
>  {
>      if (!is_suspended) {
>          return;
>      }
> +    notifier_list_notify(&wakeup_notifiers, &reason);
>      reset_requested = 1;
>      qemu_notify_event();
>      is_suspended = false;
>  }
>  
> +void qemu_register_wakeup_notifier(Notifier *notifier)
> +{
> +    notifier_list_add(&wakeup_notifiers, notifier);
> +}
> +
>  void qemu_system_killed(int signal, pid_t pid)
>  {
>      shutdown_signal = signal;


--
                        Gleb.

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