Re: [Xen-devel] Xen IPC

[Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx>]

On Thu, Aug 6, 2009 at 9:01 AM, Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx> wrote:

Thanks for your response.  I am working with the Xen Hypervisor, but I am not familiar with xentrace.  I found some information about it through google searches, but I was unable to discover how it uses the shared page you mentioned.  Do you have any links to point me in the right direction?  Thanks
--Derek

On Mon, Aug 3, 2009 at 12:17 PM, George Dunlap <George.Dunlap@xxxxxxxxxxxxx> wrote:

Derek,

I assume you mean "Xen Hypervisor" (as the kernel would be probably
Linux dom0 kernel)?

You might look at the xentrace mechanism for using a shared page to
pass information out of Xen.  You could probably adapt the same idea
to pass information into Xen if you needed to.

 -George

On Fri, Jul 31, 2009 at 5:39 PM, Derek
Riley<derek.riley@xxxxxxxxxxxxxxxxxxx> wrote:
> Hello-
> I am working on a project to modify Xen to precisely control the execution
> times of the individual guest domains, and I need some help.  I considered
> modifying the XM python program, but it is not precise or fast enough for my
> application.
>
> I want to be able to pass short, simple message quickly between an
> application-level process and the Xen kernel asynchonously.  I found an IPC
> mechanism designed for the method called netlink
> (http://www.linuxjournal.com/article/7356), but I am not sure how to
> incorporate it into the Xen kernel.  When I attempt to recompile the kernel
> with netlink, I get errors that seem to stem from type issues I am not
> familiar with.
>
> 2 questions:
> Is it possible to use a mechanism such as netlink with Xen?  If so, how?
> Is there other functionality within Xen that could be used with minimal
> modification to do IPC within domain0?
>
> Any help/advice would be greatly appreciated.  Thanks!
> --Derek

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