Re: [Xen-devel] Migration v2 and related work for 4.6

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Apr 02, 2015 at 10:34:34AM +0100, Andrew Cooper wrote:
> On 02/04/15 10:03, Ian Campbell wrote:
> > On Wed, 2015-04-01 at 12:03 +0100, Andrew Cooper wrote:
> >> I propose that the libxc series be accepted independently of the libxl
> >> series.
> > That is most likely a good idea IMHO.
> >
> > What do you estimate the chances of the libxl bit being done for 4.6 to
> > be?
> 
> I hope to have everything complete for 4.6, including removal of the
> legacy code.
> 

Not sure what "legacy code" you're referring to, but we definitely want
to support 4.5 -> 4.6 migration so the "legacy code" might need to stay
for 4.6?

Wei.

> Given the current timescales, I would say most likely.
> 
> >
> > Is there an option of actually switching to the new libxc without
> > switching libxl and fixing libxl later, or would that be as much work as
> > just fixing libxl?
> 
> For PV guests, yes.  One can transparently swap the legacy algorithm
> from the v2 algorithm and every works.
> 
> For HVM guests, no.  The handling of the Qemu save record and toolstack
> records needs fixing.
> 
> In the upgrade case, libxl also needs to take care of piping the legacy
> stream through the conversion script.
> 
> ~Andrew

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