On Mon, 2013-02-18 at 12:31 +0000, Nitin Gupta wrote:
> Hi,
>
>
> I am running xen-hypervisor over qemu.

You mean running Xen in a virtual machine provided by qemu? Or are you
talking about the qemu which is associated with an HVM domain under Xen
(i.e. the one running in dom0 or a stub domain).

>  Now while running domU I want to write on an IO port, which I'll be
> handling inside Qemu. Basically, this is a communication mechanism for
> me to communicate with qemu. I am writing on port number '0x378' as a
> root user using "outl" function. But when I run this code in domU, it
> does not reach qemu.
>
> So my question is: Is there  some mechanism in xen which handles
> writing on IO ports and in case its not a valid IO Port then just
> discards the write.
>
> --
> Regards,
> Nitin Gupta
>
>