Re: [Xen-devel] XenStore permissions from kernel space

[James Pendergrass <james.pendergrass@xxxxxxxxxx>]

It's actually more straightforward than that,  the module takes an  
integer param N indicating how many
connections to open, and opens connections to dom's 0 through N-1.  I  
know this scheme doesn't generalize
at all, but the specific project it's for is aiming for extreme  
simplicity over generality.
-- aaron

On Jun 15, 2006, at 9:51 AM, Keir Fraser wrote:

> On 15 Jun 2006, at 14:37, James Pendergrass wrote:
>
> > I've been working on a kernel module that shares some pages  
> > between to domUs.
> > In the course of doing this I had the need to communicate  
> > information via XenStore (e.g., the grant references),
> > but for a number of reasons did not want to use the full XenBus  
> > registration/probe/hotplug...system (it is too dynamic,
> > and requires a kick off event from dom0 rather than allowing self  
> > organizing shares between domUs).
> > I established that the only thing preventing my setup of domA  
> > writing to a node in XenStore and domB reading it
> > was the lack of the xs_get/set_permissions function in the kernel  
> > level xenbus/xenstore interface.  So I ported those
> > functions down from the userland xenstore libraries.
> >
> > I expect that others may appreciate the ability to set XenStore  
> > perms from kernel space, so here's a patch.
> In your scheme, how do you discover the domid(s) of the domains you  
> need to communicate with? Is that done with some simple start-of- 
> day config info written into xenstore by domain0?
>  -- Keir

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