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Re: [Qemu-devel] [PATCH 7/7] RTC: Allow to migrate from old QEMU

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 7/7] RTC: Allow to migrate from old QEMU
Date: Mon, 23 Jul 2012 09:30:22 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

Il 23/07/2012 07:12, Juan Quintela ha scritto:
>     .fields      = (VMStateField []) {
>         VMSTATE_BUFFER(cmos_data, RTCState),
>         VMSTATE_UINT8(cmos_index, RTCState),
>         VMSTATE_INT32(current_tm.tm_sec, RTCState),
>         VMSTATE_INT32(current_tm.tm_min, RTCState),
>         VMSTATE_INT32(current_tm.tm_hour, RTCState),
>         VMSTATE_INT32(current_tm.tm_wday, RTCState),
>         VMSTATE_INT32(current_tm.tm_mday, RTCState),
>         VMSTATE_INT32(current_tm.tm_mon, RTCState),
>         VMSTATE_INT32(current_tm.tm_year, RTCState),
> you can change this to:
>         VMSTATE_UNUSED(7*4);

I think this is not safe.  In the load_old case, we ignore the struct tm
because we call rtc_set_time and check_update_timer.  We need this to
make up some values of base_rtc, last_update and offset.

In the normal case we need both the CMOS data and the timer data.
Though perhaps I can make a further change and remove current_tm
altogether.  I'll take a look this week; however that will make it even
harder to produce the old version.


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