[Xen-devel] AMD crash on restore. bug in MTRR restore. 4.0.2-rc2

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Subject:	[Xen-devel] AMD crash on restore. bug in MTRR restore. 4.0.2-rc2-pre
From:	"James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date:	Wed, 26 Jan 2011 17:18:50 +1100
Cc:	Tim Deegan <Tim.Deegan@xxxxxxxxxx>
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Thread-topic:	AMD crash on restore. bug in MTRR restore. 4.0.2-rc2-pre

The mtrr save code on my AMD system reads the first MTRR as
0x00000000f0000000,0x000000fff8000800. When it tries to restore in
mtrr_var_range_msr_set, 0x000000fff8000800 is rejected as invalid and
not restored.

Commenting out the check against the mask, as well as Tim's patch to fix
the segment registers makes the output of xen-hvmctx match before the
save and after the restore.

Windows still crashes on restore though so I don't know if this has
anything to do with it.

James

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[Xen-devel] AMD crash on restore. bug in MTRR restore. 4.0.2-rc2-pre