Re: [Xen-devel] [PATCH] VT-d: improve RMRR validity checking

[Noboru Iwamatsu <n_iwamatsu@xxxxxxxxxxxxxx>]

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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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel

Attachment: 01_vtd-drhd-workaround.patch
Description: Text document

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

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