Re: [Xen-devel] Daemon on XEN

[George Dunlap <George.Dunlap@xxxxxxxxxxxxx>]

There are a number of programs in the tools/ directory which
communicate directly with Xen.  It generally involves:
* Xen setting up a page to write data into.  A ring structure with
producer/consumer pointers is pretty standard
* A way for dom0 to find out the page and map it
* An event channel to wake the guest program up when there's data in the ring.

You can look at tools/xentrace.c and xen/common/trace.c for an example.

 -George

On Sat, Sep 4, 2010 at 9:12 AM, Carlo Maiero <zesster@xxxxxxxxx> wrote:
> I'm making a patch to watch the security of DomU.
> i've done a patch that print to the xm dmesg the result of some interception
> of SystemCall and Hypercall.
> with "printk".
> I want to send some data outside Xen in real-time, to a device or any port.
> Which is the best way to send data
> from the hypervision to a deamon running on Dom0?
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