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Re: [Xen-users] Re: VT-D RMRR is incorrect

To: Christian Tramnitz <chris.ace@xxxxxxx>
Subject: Re: [Xen-users] Re: VT-D RMRR is incorrect
From: Yoshiharu Mori <ymori4480@xxxxxxxxx>
Date: Sun, 22 Feb 2009 01:58:30 +0900
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Hi Christian

Yoshiharu, have you tested Xen-unstable yet? When commenting out the EFAULT you mentioned I get an immediate panic related to the rmrr address conflict on the latest 3.4-unstable tree.
I also tried Xen-unstable, but could not boot xen when I commented out the EFAULT.
(The boot message was too fast and my machine was rebooted soon, I counldn't understand details.)

BTW, I got new BIOS from SUPERMICRO. But I cannot test till next week end.
Another trouble was happend on my board, I sent it to distributor and change it.

@Xen devs: Is this something that could be worked around in Xen or do we really have to rely on exact RMRR values for vtd to work?
See http://permalink.gmane.org/gmane.comp.emulators.xen.user/43937 for more details.
The RMRR regions are expencted to be used only for USB and UMA Graphics legacy usages for reserved memory, I think it may be possible to use vtd with limitation.

Yoshiharu Mori
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