Re: [Xen-devel] [PATCHv1] xen/balloon: disable memory hotplug in PV guests

[Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>]

On 03/09/2015 11:13 AM, David Vrabel wrote:
> On 09/03/15 15:09, Boris Ostrovsky wrote:
> > On 03/09/2015 10:10 AM, David Vrabel wrote:
> > > Memory hotplug doesn't work with PV guests because:
> > >
> > >     a) The p2m cannot be expanded to cover the new sections.
> > >
> > >     b) add_memory() builds page tables for the new sections which means
> > >        the new pages must have valid p2m entries (or a BUG occurs).
> > Is this due to recent p2m rework?
> (a) is but (b) has always meant memory hotplug on PV was broken.
I can see why (b) should probably have prevented it from working but I 
tried this on 4.4/3.17 and that seemed to work (it indeed does not 
function well on newer bits).
-boris

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