[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.