Re: [Xen-devel] Source of guest-physical address in PCI BAR for

To:	"Samuel Thibault" <samuel.thibault@xxxxxxxxxxxxx>, "David Stone" <unclestoner@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	Re: [Xen-devel] Source of guest-physical address in PCI BAR for HVM domain?
From:	"David Stone" <unclestoner@xxxxxxxxx>
Date:	Fri, 4 Jan 2008 13:25:47 -0500
Delivery-date:	Fri, 04 Jan 2008 10:26:13 -0800
Dkim-signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=a0MCP65ah4ZtD3MCR4+gIiRZMOqKIptBK+QnhBBPMn4=; b=rux2aSvQZYqqUQaib+GuqEfD4shRu1FdfyJLRICWXBIjTFjwBKp6h/eB+MsGMFakNSeZrn/Se+LJr5f3aTETpXov/YLH2eLCHCK65c3+irTkl3mLbY7/eZKDaesbBBbVOWpoQr8Xg45JrzZmgaquZsgjt9IrPaiAaJoIL0l6QMw=
Domainkey-signature:	a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=qkgTHkUqK5DV8UPHZpujyw7EWSTpf+j86sqcEaQoRfApSa7rs+CBC/xB1iHk4D1Gyst89jizGqW8T/+B0rS4yqm88LBJmzquYJnoj7F3WiIhm+eAkOKm3YS2+AZn3IyNoTIY1aOF61JGz6U+d9kUjFmVUrU/lv2g0zzPErrKnJE=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<20080104164712.GK5666@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References:	<1a74a8410801040835t5bb40477u128d310f9d1ed201@xxxxxxxxxxxxxx> <20080104164712.GK5666@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx

Thanks for your response.

> > So I guess this the PCI config-space write to set the BAR is passed to
> > qemu-dm as a command from the hypervisor
>
> Yes.

But doesn't qemu act as the BIOS for HVM domains?  Why would the
hypervisor be doing the initial PCI BAR setup?

> > If so, shouldn't the early PCI configuration from the BIOS be coming
> > from qemu itself?
>
> It is. It's odd you have troubles so early in the boot, is your
> configuration a bit special in any way?

Yes, I didn't mention the most important part: the device in question
is a physical PCI device (a PCI Express graphics card) that I am
passing through to the Windows 2003 guest domain via VT-d.  (The VT-d
support generally works for me because I can pass a PCI NIC through no
problem.)  (I realize VT-d'ing a PCI-XP graphics card is
experimental...but that's what I'm doing, experimenting...).

Thanks,
Dave

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

Re: [Xen-devel] Source of guest-physical address in PCI BAR for HVM doma