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[Xen-bugs] [Bug 821] New: Can not change mtrr registers

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Subject: [Xen-bugs] [Bug 821] New: Can not change mtrr registers
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Date: Mon, 27 Nov 2006 12:39:29 -0800
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           Summary: Can not change mtrr registers
           Product: Xen
           Version: unstable
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Unspecified
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: fhuberts@xxxxxxxxx

I have a Fedora Core 6 system with 4GB RAM and an ATI gfx card. For the gfx
card to work optimally it needs write-combining.
My BIOS doesn't set up the write-combining so I have to do it myself (I think
no BIOS does setup this).

With a PAE kernel I can adjust the mtrr settings just fine, but xen does not
allow me to do this. When I try to disable an entry or add an entry then the
shell responds with an 'echo' error.

xen release is 3.0.3-rc5-1.2849.f
kernel is 2.6.18-1.2849.fc6xen

I have an asus p5w mb and use the memory remapping bios setting: 2GB from 0GB
and 2GB from 4GB (PAE mode). The 2GB from 2GB are uncacheable, and the region
d0-e0 needs to be write-combing.

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