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

[Juergen Gross <jgross@xxxxxxxx>]

On 03/19/2015 02:38 PM, Juergen Gross wrote:
> On 03/19/2015 12:34 PM, Daniel Kiper wrote:
> > On Thu, Mar 19, 2015 at 10:55:37AM +0100, Juergen Gross wrote:
> > > On 03/18/2015 04:14 PM, Daniel Kiper wrote:
> > [...]
> >
> > > > I have checked new p2m code and I think that this is reasonable
> > > > solution too.
> > > Do I need any patches for xl to be able to test this? I did:
> > >
> > > xl mem-max 2 4096
> > > xl mem-set 2 4096
> > Yep. I started work on it but I was not able to finish it.
> > Here you can find some old patches for this issue:
> >
> > http://lists.xen.org/archives/html/xen-devel/2013-04/msg03072.html
> >
> > Bob and I will work on it sooner or later (probably a bit later).
> >
> > Hmmm... Boris, David, how did you manage to get this memory hotplug
> > stuff working. Did you use xm instead of xl?
> Whoever can test this - what about the attached patch?
Already succeeded in testing. :-)

Rather easy via:

Dom0: xl mem-max <domain> <size>
DomU: echo <size_in_kb> 
>/sys/devices/system/xen_memory/xen_memory0/target_kb
On my system udev is set up to add the memory automatically, so no
further action required for me.

> David, you said:
>
> This one can be trivially fixed by setting the new sections in the p2m
> to INVALID_P2M_ENTRY before calling add_memory().
>
> Are you preparing a patch for this, or do you want me to do it?
I've already got a patch working, I'll send it soon.


Juergen

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