Re: [Xen-devel] [PATCH v2 4/6] libxc/save: Adjust stream-position callbacks for checkpointed streams

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 11/05/15 12:36, Ian Campbell wrote:
> On Fri, 2015-05-08 at 22:14 +0100, Andrew Cooper wrote:
>> There are some records which should only be sent once in the stream, and not
>> repeated for each checkpoint.  {start,end}_of_stream() become per-checkpoint,
>> and a new start_of_stream() is introduced.
>>
>> There is no resulting change record order, but the X86_PV_INFO and
>> X86_PV_P2M_FRAMES records are positively identified as once per stream, 
>> rather
>> than once per checkpoint.
> In the case of the latter judging from the comments this is currently an
> implementation detail and in principal we want to be able to resend the
> p2m frames as well?

Correct, and the spec regarding X86_PV_P2M_FRAMES was explicitly
intended to allow partial updates in the future.

It is currently an implementation bug (or many) that the P2M can't
change during the live part of migration.

~Andrew

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