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xen-devel
Re: [Xen-devel] save image file format? and [RFC] tmem save/restore/migr
John Levon wrote:
> On Thu, Jun 18, 2009 at 09:51:58AM +0100, Tim Deegan wrote:
>
>> It's still the ad-hoc stream-of-data format, I'm afraid. The whole
>> format needs a good kicking. It's not even portable between 32-bit and
>> 64-bit tools. Gianluca (Cc'd) is just starting to look at the
>> save/restore code in the hopes of making it more sane, so now would be a
>> good time to bring up any suggestions.
>
> One possibility Anthony Liguori brought up before is using all of qemu's
> container format. I'm not sure it's ever feasible to make it fully
> compatible, but it certainly seems like an obvious choice to use as a
> base. Unfortunately, I think it's defined-by-the-code as well.
>
At least in theory is certainly feasible: just a matter or registering
another savevm function for a record called "cpu" or "vcpu", that would
take care of saving the guest memory using xc_domain_save.
The qemu people are also maintaing save record compatibility now, so we
are safe from that perspective.
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