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Re: [Qemu-devel] [PATCH v2 3/8] fdc: Introduce fdctrl->phase

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2 3/8] fdc: Introduce fdctrl->phase
Date: Fri, 29 May 2015 11:55:01 +0100

On 29 May 2015 at 11:34, Dr. David Alan Gilbert <address@hidden> wrote:
> It's the destination I'm worried about here, not the source; lets say
> you have two devices, a & b.  'a' gets serialised, but then 'b' finds
> it has to wait, so we return to running the source and sending pages
> across.   However the destination has already loaded the 'a' device state;
> so that when we serialise again we send a new 'a' device state'; I'm
> worrying here that the destination 'a' state loader would get upset
> trying to load the same state twice without somehow resetting it.

You would need to reset the system before resending device state,
I think. Device implementations rely on knowing that migration happens
into a freshly reset device, and we don't have any way of resetting
a single device, only the whole system at once.

-- PMM

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