Re: [Qemu-devel] [PATCH] RTC: enable lost_tick_policy=slew as default

[Paolo Bonzini]

Il 11/12/2012 22:49, Marcelo Tosatti ha scritto:
> 
> RTC interrupt reinjection has no known negative effect. Lack of 
> RTC interrupt reinjection, though, has negative effects: time drift
> for Windows guests which use it as a timer source. 
> 
> Based on that, enable lost_tick_policy=slew option as default.
> 
> Signed-off-by: Marcelo Tosatti <address@hidden>
> 
> diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
> index c79fca7..c9e007d 100644
> --- a/hw/mc146818rtc.c
> +++ b/hw/mc146818rtc.c
> @@ -884,7 +884,7 @@ ISADevice *rtc_init(ISABus *bus, int base_year, qemu_irq 
> intercept_irq)
>  static Property mc146818rtc_properties[] = {
>      DEFINE_PROP_INT32("base_year", RTCState, base_year, 1980),
>      DEFINE_PROP_LOSTTICKPOLICY("lost_tick_policy", RTCState,
> -                               lost_tick_policy, LOST_TICK_DISCARD),
> +                               lost_tick_policy, LOST_TICK_SLEW),
>      DEFINE_PROP_END_OF_LIST(),
>  };
>  
> 
> 
> 

This needs versioning for old machine types, though.

Paolo