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Re: [Xen-devel] Xen IPC

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] Xen IPC
From: Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx>
Date: Thu, 6 Aug 2009 09:04:25 -0500
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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

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

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.


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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