[Xen-ia64-devel] Re: PATCH: allow domain to set shared_info address

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 22 Juin 2006 19:55, Magenheimer, Dan (HP Labs Fort Collins) a écrit :
> Can shared_info be changed randomly at any time by
> a domain?
Yes
>  Will this cause any problems?
No, as long as domain does it correctly.  Safe when UP, should be done with a 
lot of care when SMP.

> If this
> hypercall can/should be called only very early during
> boot, it would be good to add some checks to disallow
> it from being called at a later time.
Two points:
* it may be done at anytime
* I don't really see what checks can be implemented.

Tristan.

>
> > -----Original Message-----
> > From: Tristan Gingold [mailto:Tristan.Gingold@xxxxxxxx]
> > Sent: Thursday, June 22, 2006 3:23 AM
> > To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx; Magenheimer, Dan (HP
> > Labs Fort Collins); Williamson, Alex (Linux Kernel Dev)
> > Subject: PATCH: allow domain to set shared_info address
> >
> > Hi,
> >
> > this patch add a new hypercall to set shared_info address.
> > Currently it is disabled in order not to break backward
> > compatibility with
> > previous Xen (for FC6 people).
> >
> > Tested by booting dom0+domU (2w) using old address
> > Tested by booting dom0+domU (2w) using -1MB address.
> >
> > Tristan.

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