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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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