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Re: [Xen-devel] [PATCH RFC 1/2] linux/vnuma: vnuma support for pv guest

On mar, 2013-08-27 at 10:33 -0400, Konrad Rzeszutek Wilk wrote:
> Unfortunatly that won't happen if you boot this under dom0. It will
> find on some AMD machines the AMD Northbridge and try to scan that.
> And blow up.
Well, perhaps this was not evident enough in Elena's mails and patches,
but her current target is actually DomU. :-P

However, that's only because we're proceeding in steps, so yes, once
DomU will be working, Dom0 will become the target, and we'll have to
start caring about not making things explode! :-O

> If you look at the git commit that did the 'numa = 0' you will see
> the backstory.
That's something interesting to look at... I remember having seen that
discussion but not the details. I'll check when back from vacation.

> I think part of enablement of ' numa = 1' is to wrap it with
>       if (xen_initial_domain() && xen_supports_this_hypercall())
>               numa = 1;
> in the #2 patch.
Mmm... Did you mean '!xen_initial_domain()' ? Or is it me that did not
understand your comment about Dom0 above?

In case you did mean '!', again, this would be fine for now, since the
target is DomUs. At the point when we will start chasing Dom0, it would
be interesting to find a solution to this issue... :-/

Anyway, thanks for pointing this out.


<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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