This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] error messages when doing VT-d device passthrough

To: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] error messages when doing VT-d device passthrough
From: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Date: Mon, 30 Aug 2010 16:57:03 -0700
Accept-language: en-US
Acceptlanguage: en-US
Cc: "tim.deegan@xxxxxxxxxxxxx" <tim.deegan@xxxxxxxxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
Delivery-date: Mon, 30 Aug 2010 16:58:25 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: ActInwr2H4iSzD3cSxyi+fCT5SPUYA==
Thread-topic: error messages when doing VT-d device passthrough

I’m getting the following error messages when doing Vt-d device passthrough:


 (XEN) p2m.c:2626:d0 clear_mmio_p2m_entry: gfn_to_mfn failed! gfn=000f303b


This message is printed out for each MMIO page used by the device.  This seems to be cause by the code change from “if ( INVALID_MFN == mfn)” to “if (!mfn_valid(mfn) )” in p2m.c/clear_mmio_p2m_entry().


What is the reason for the change?



Xen-devel mailing list