Re: [Xen-devel] [PATCH 1/1] xc_domain_restore: Allow QEMU to increase memory

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 15 Apr 2015, Hongyang Yang wrote:
> On 04/15/2015 06:09 PM, Ian Campbell wrote:
> > On Wed, 2015-04-15 at 10:46 +0100, Stefano Stabellini wrote:
> > > On Tue, 14 Apr 2015, Don Slutz wrote:
> > > > On 04/14/15 04:53, Wei Liu wrote:
> > > > > Is there a way to know how much more memory each option rom needs? If
> > > > > so, you can correctly account for the extra memory you need. This
> > > > > would
> > > > > be an ideal fix to this problem.
> > > > 
> > > > I do not know of a way to get this info.  It can change based on the
> > > > QEMU version.
> > > 
> > > Indeed it would be fragile to rely on a fixed size for each option rom,
> > > given that they come out of the QEMU tree and can change at any time.
> > 
> > Only having dipped into this thread so far it seems to me we need some
> > way for qemu to communicate the result of its manipulations of maxmem
> > into the migration stream explicitly to be picked up by the other end.
> 
> Totally agreed.

Xen knows exactly the maxmem setting for the domain, I don't think we
need one more notification from QEMU?
Libxl/Xen could just write the maxmem value to the migration stream.

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