Re: [Qemu-devel] [Patch] [kinda-resend] persistent real-time-clock

[Dan Kenigsberg]

On Sun, Apr 27, 2008 at 07:39:42PM +0300, Avi Kivity wrote:
> Dan Kenigsberg wrote:
>> Real PC lets its user set the real-time-clock and store it on CMOS,
>> which advances the clock even when the PC is offline.
>>
>> These patches will allow doing the same with VM:
>> - Before shutting a VM down, use the monitor's info timeoffset to see
>>   how much (in seconds) does the rtc differ from the host clock.
>> - Store this offset somewhere.
>> - Use it next time with -startdate now+offset.
>>
>> Please tell me what do you think of it.
>>   
>
> How about (additionally) modifying -startdate to accept an offset directly?
>
>   qemu -startdate +0300 ...
>
> Useful for those Windows VMs which have localtime in cmos.

I'm missing somthing: in what way is it different than the suggested

    qemu -startdate now+offset ?

Only in allowing to specify the offset in hours/minutes?