From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: DomU trying to write on an IO Port
Date: Mon, 18 Feb 2013 13:46:20 +0000
Message-ID: <1361195180.31407.164.camel@zakaz.uk.xensource.com>
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To: Nitin Gupta <nitin.kobain@gmail.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
List-Id: xen-devel@lists.xenproject.org

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
> 
>