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

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Subject: [Xen-devel] RE: error messages when doing VT-d device passthrough
From: "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
Date: Mon, 30 Aug 2010 17:08:22 -0700
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Cc: "tim.deegan@xxxxxxxxxxxxx" <tim.deegan@xxxxxxxxxxxxx>, "Christoph.Egger@xxxxxxx" <Christoph.Egger@xxxxxxx>, Keir Fraser <Keir.Fraser@xxxxxxxxxxxxx>
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Thread-topic: error messages when doing VT-d device passthrough

Cc’ing Christoph Egger since this change was part of the “nested Virtualization: p2m infrastructure” in cs# 21940.


From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Kay, Allen M
Sent: Monday, August 30, 2010 4:57 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Cc: tim.deegan@xxxxxxxxxxxxx; Keir Fraser
Subject: [Xen-devel] 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?



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