Hi,
Some Q35 mainboard that has buggy BIOS, I have one of this,
reports invalid DRHD in addition to the invalid RMRR.
Attached patch fixes this DRHD issue in the same way as RMRR.
And also, I fixed RMRR validity checking loop.
Noboru.
Signed-off-by: Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>
-------- Original Message --------
Subject: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking
From: Han, Weidong <weidong.han@xxxxxxxxx>
To: xen-devel@xxxxxxxxxxxxxxxxxxx <xen-devel@xxxxxxxxxxxxxxxxxxx>
Date: Thu Jan 21 2010 11:46:12 GMT+0900

Currently, Xen checks RMRR range and disables VT-d if RMRR range is set 
incorrectly in BIOS rigorously. But, actually we can ignore the RMRR if the 
device under its scope are not pci discoverable, because the RMRR won't be used 
by non-existed or disabled devices.
This patch ignores the RMRR if the device under its scope are not pci 
discoverable, and only checks the validity of RMRRs that are actually used. In 
order to avoid duplicate pci device detection code, this patch defines a 
function pci_device_detect for it.
Signed-off-by: Weidong Han<weidong.han@xxxxxxxxx>
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Attachment: 01_vtd-drhd-workaround.patch
Description: Text document

Attachment: 02_vtd-rmrr-workaround-fix.patch
Description: Text document

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