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

["Kay, Allen M" <allen.m.kay@xxxxxxxxx>]

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?

 

Allen

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