Hi Dave,
I found the DMAR (VT-d) was also enabled in pvops dom0 in the log. It should
not happen because Xen zaps ACPI DMAR signature to prevent dom0 using VT-d.
Could you apply below small patch to confirm that xen really zaps ACPI DMAR?
diff -r 2f98b700605f xen/drivers/passthrough/vtd/dmar.c
--- a/xen/drivers/passthrough/vtd/dmar.c Wed Jan 27 08:59:47 2010 +0000
+++ b/xen/drivers/passthrough/vtd/dmar.c Thu Jan 28 09:44:31 2010 +0800
@@ -673,6 +673,8 @@ out:
out:
/* Zap ACPI DMAR signature to prevent dom0 using vt-d HW. */
dmar->header.signature[0] = '\0';
+ printk(XENLOG_WARNING
+ "Zap ACPI DMAR signature to prevent dom0 using VT-d HW.\n");
return ret;
}
-----Original Message-----
From: David P. Quigley [mailto:dpquigl@xxxxxxxxxxxxx]
Sent: Thursday, January 28, 2010 2:48 AM
To: Han, Weidong
Cc: Pasi Kärkkäinen; Daniel Stodden; xen-devel@xxxxxxxxxxxxxxxxxxx; Konrad
Rzeszutek Wilk
Subject: RE: [Xen-devel] Xen 4.0 + PVOPS + Intel VTD + USB EHCI = BUG()
On Wed, 2010-01-27 at 10:49 +0800, Han, Weidong wrote:
> Can you pls post the serial output? It should have warning messages if it is
> caused by VT-d.
>
> Regards,
> Weidong
>
> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of David P.
> Quigley
> Sent: Wednesday, January 27, 2010 4:21 AM
> To: Pasi Kärkkäinen
> Cc: Daniel Stodden; xen-devel@xxxxxxxxxxxxxxxxxxx; Konrad Rzeszutek
> Wilk
> Subject: Re: [Xen-devel] Xen 4.0 + PVOPS + Intel VTD + USB EHCI =
> BUG()
>
> On Tue, 2010-01-26 at 21:46 +0200, Pasi Kärkkäinen wrote:
> > On Tue, Jan 26, 2010 at 02:30:09PM -0500, David P. Quigley wrote:
> > > I have a small update on the problem. It does seem like it is tied
> > > to VT-D because I just turned it off in the bios and the dom0
> > > manages to boot on top of xen and I can log in. Are there any
> > > options for VT-D that you would like me to try to help pin point the
> > > problem?
> > >
> >
> > At least update to the latest xen-unstable tree, since -rc2 got just
> > released, and it has some VT-d fixes/changes.
> >
> > -- Pasi
>
> I updated my xen-unstable tree and tried to turn VT-D back on and it
> breaks booting again so we still have a bug on our hands.
>
> Dave
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel
Hello,
Attached is the full serial console output with vt-d enabled from the
xen 4.0-pre ascii art to the kernel oops in dom0.
Dave
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