Re: [Xen-devel] xenstore and "my domid" on hvm guest

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

I think xenstore accesses in a domU have a 'current working directory' of
/local/domain/<domid>/. What happens if you try accesses without an initial
/ in the path?

 -- Keir

On 21/5/08 21:03, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> It appears that if an hvm guest has /proc/xen/xenbus, the
> xenstore-* tools can be made to work inside this guest.
> For example, inside an hvm guest which (according to
> "xm list" in domain0) has a domid of 2, I can do:
> 
> # xenstore-ls /local/domain/2
> 
> and it works fine, whereas:
> 
> # xenstore-ls /local/domain/0
> 
> fails properly with "Permission denied".
> 
> So I can use xenstore-read and xenstore-write inside the
> guest but I need to know "my" domid to do so.
> 
> Is there any way from inside the guest to determine
> its domid?  Alternately, is there any syntax for the
> xenstore tools that allows me to refer to "self"?
> 
> By using xenstore-exists repeatedly marching through the
> numerals, I can figure it out, but is there a better
> way?
> 
> Thanks,
> Dan
> 
> ===================================
> Thanks... for the memory
> I really could use more / My throughput's on the floor
> The balloon is flat / My swap disk's fat / I've OOM's in store
> Overcommitted so much
> (with apologies to the late great Bob Hope)
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