From: Alex Williamson <alex.williamson@hp.com>
To: Weidong Han <weidong.han@intel.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
Noboru Iwamatsu <n_iwamatsu@jp.fujitsu.com>,
"Cihula, Joseph" <joseph.cihula@intel.com>,
"Kay, Allen M" <allen.m.kay@intel.com>,
"linux@eikelenboom.it" <linux@eikelenboom.it>,
"keir.fraser@eu.citrix.com" <keir.fraser@eu.citrix.com>
Subject: Re: [PATCH] VT-d: improve RMRR validity checking
Date: Tue, 09 Mar 2010 20:18:21 -0700 [thread overview]
Message-ID: <1268191101.3015.30.camel@2710p.home> (raw)
In-Reply-To: <4B9706B3.3050903@intel.com>
On Wed, 2010-03-10 at 10:40 +0800, Weidong Han wrote:
> Alex Williamson wrote:
> >
> > I have a system with what I consider to be a valid DRHD that's getting
> > tripped up on this patch. The problem is that the DRHD includes an
> > IOAPIC scope, where the IOAPIC is not materialized on the PCI bus. I
> > think Xen is being overzealous in it's validity checking and that this
> > is a valid configuration. What do others think? Are IOAPICs a
> > special case that we can allow to be non-existent on the PCI bus?
> >
> Yes, IOAPIC can be not pci-discoverable. IOAPICs are only reported in
> the "Include_all" DRHD, and our patch won't check if the device is
> pci-discoverable or not for the "Include_all" DRHD. So I think the patch
> is no problem unless IOAPIC is not included in the "Include_all" DRHD.
> Can you post your boot logs?
Weidong,
That's a very subtle restriction, and I'm not sure how it works in
practice. If I have a multi-IOH system, each with VT-d hardware, each
supporting interrupt remapping, each with one or more IOAPICs below
them, how can interrupt remapping work if we can only associate an
IOAPIC with the "include all" DRHD? I'm confused. Thanks,
Alex
next prev parent reply other threads:[~2010-03-10 3:18 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 2:46 [PATCH] VT-d: improve RMRR validity checking Han, Weidong
2010-01-21 8:25 ` Noboru Iwamatsu
2010-01-21 8:38 ` Han, Weidong
2010-01-21 10:03 ` Noboru Iwamatsu
2010-01-21 10:08 ` Noboru Iwamatsu
2010-01-21 10:19 ` Weidong Han
2010-01-21 10:27 ` Keir Fraser
2010-01-21 10:49 ` Weidong Han
2010-01-21 12:19 ` Noboru Iwamatsu
2010-01-21 12:46 ` Weidong Han
2010-01-21 14:01 ` Keir Fraser
2010-01-21 14:17 ` Sander Eikelenboom
2010-01-21 14:33 ` Keir Fraser
2010-01-22 2:12 ` Weidong Han
2010-01-22 2:38 ` Noboru Iwamatsu
2010-01-22 2:53 ` Weidong Han
2010-01-22 3:16 ` Noboru Iwamatsu
2010-01-22 8:47 ` Weidong Han
2010-01-22 9:19 ` Sander Eikelenboom
2010-01-22 12:15 ` Weidong Han
2010-01-22 12:32 ` Pasi Kärkkäinen
2010-01-23 12:40 ` Weidong Han
2010-01-23 13:08 ` Pasi Kärkkäinen
2010-01-23 14:33 ` Sander Eikelenboom
2010-01-23 14:54 ` [PATCH] VT-d: improve RMRR validity checking, documenting boot options Pasi Kärkkäinen
2010-01-25 16:40 ` Stephen Spector
2010-01-25 16:58 ` Documentation Xen-hypervisor and Dom0 xen-related boot options (was Re: [PATCH] VT-d: improve RMRR validity checking, documenting boot options) Sander Eikelenboom
2010-01-25 20:56 ` Stephen Spector
2010-01-27 11:33 ` Pasi Kärkkäinen
2010-01-25 7:06 ` [PATCH] VT-d: improve RMRR validity checking Noboru Iwamatsu
2010-01-25 7:56 ` Weidong Han
2010-01-25 9:02 ` Sander Eikelenboom
2010-01-25 9:11 ` Weidong Han
2010-01-25 9:22 ` Noboru Iwamatsu
2010-01-25 10:08 ` Weidong Han
2010-01-25 10:45 ` Sander Eikelenboom
2010-01-25 13:43 ` Keir Fraser
2010-01-25 13:57 ` Christian Tramnitz
2010-01-25 14:10 ` Weidong Han
2010-01-26 1:16 ` Noboru Iwamatsu
2010-01-26 5:51 ` Weidong Han
2010-01-26 6:38 ` Noboru Iwamatsu
2010-01-26 6:42 ` Weidong Han
2010-01-25 14:12 ` Weidong Han
2010-01-25 14:13 ` Han, Weidong
2010-03-09 21:39 ` Alex Williamson
2010-03-09 21:30 ` Konrad Rzeszutek Wilk
2010-03-09 21:57 ` Alex Williamson
2010-03-09 22:22 ` Konrad Rzeszutek Wilk
2010-03-09 23:05 ` Alex Williamson
2010-03-09 23:25 ` Alex Williamson
2010-03-10 2:13 ` Alex Williamson
2010-03-10 2:40 ` Weidong Han
2010-03-10 3:18 ` Alex Williamson [this message]
2010-03-10 3:28 ` Weidong Han
2010-03-10 3:37 ` Alex Williamson
2010-03-10 4:25 ` Weidong Han
2010-03-10 4:47 ` Alex Williamson
2010-03-10 7:03 ` Weidong Han
2010-03-10 13:56 ` Alex Williamson
2010-03-10 18:06 ` Alex Williamson
2010-03-11 2:11 ` Weidong Han
2010-03-11 2:32 ` Alex Williamson
2010-03-11 3:44 ` Weidong Han
2010-03-11 4:52 ` Alex Williamson
2010-03-11 8:30 ` Weidong Han
2010-01-21 15:28 ` Andrew Lyon
2010-01-21 15:04 ` Keir Fraser
2010-01-22 1:35 ` Noboru Iwamatsu
2010-01-21 10:13 ` Weidong Han
2010-01-21 12:09 ` Noboru Iwamatsu
2010-01-21 12:38 ` Weidong Han
2010-01-22 0:23 ` Noboru Iwamatsu
2010-01-21 8:45 ` Andrew Lyon
2010-01-21 10:03 ` Weidong Han
2010-01-21 9:15 ` Keir Fraser
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