Re: [Xen-devel] [PATCH] libxc: increase maximum migration stream record length

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 10/08/17 12:24, Juergen Gross wrote:
> Today the maximum record lenth in a migration stream is 8MB. This
> limits the size of a PV domain to a little bit less than 1TB in the
> migration case, as the P2M frame list will exceed 8MB in this case.
>
> Raising the record size limit by a factor of 16 allows for domain
> sizes of nearly 16TB to be migrated. This ought to be enough.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Hmm - Changing this isn't something I've considered when it comes to ABI
compatibility.  I also see that there is no mention of the maximum
record length in the stream spec, which is an oversight.

Worse still, there is no record length check in the python utilities,
but both sides of the C code perform the check.

Let me ponder the implications.

~Andrew

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