Re: [Xen-devel] Permission for xenstore operation on HVM

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Thu, 2011-12-01 at 10:16 +0000, Alessandro Salvatori wrote:
> On Thu, Dec 1, 2011 at 01:45, Vasiliy Tolstov <v.tolstov@xxxxxxxxx> wrote:
> > In HVM mode You allow write to /local/domain/$DOMID/data
> 
> do you mean that in PV mode one can write to vm-data, and in HVM mode
> one can write to data?

With the xl toolstack it is "data" in both cases. I can't speak for
other toolstacks but it would be nice if they were all consistent...

> in fact in my first message that never went through I had two
> theories, and I chopped the first one because I was thinking it
> sounded too ridiculous of me to say :)
> 
> > theory 1: for HVM guests Xen gives the ownership of the xenstore variables
> > to dom0 instead of the domU that is running the guest. My humble guess is
> > that Xen assumes that HVM guests are gonna be hypervisor agnostic and
> > not gonna be using xenstore. Of course this assumption breaks when you
> > have PV-HVM guests.
> 
> of course, if that is the case, then at provisioning time one wouldn't
> know an HVM guest is gonna actually become a PV-HVM... so it will
> still be treated as an HVM guest... sigh...
> 
> now, I wonder: can one get the data directory through XAPI though?

If you are running xapi then xen-api@xxxxxxxxxxxxxxxxxxx is the correct
place to ask for help.

Ian.

> 
> thanks!
> -Alessandro-
> 
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