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

["James Harper" <james.harper@xxxxxxxxxxxxxxxx>]

Additionally, WinDbg tells me that MSR's 175, and 176 are wiped out by
save/restore:

immediately before suspend
kd> rdmsr 174
msr[174] = 00000000`00000008
kd> rdmsr 175
msr[175] = 00000000`8039e000
kd> rdmsr 176
msr[176] = 00000000`816a4950

immediately after restore
kd> rdmsr 174
msr[174] = 00000000`00000000
kd> rdmsr 175
msr[175] = 00000000`00000000
kd> rdmsr 176
msr[176] = 00000000`00000000

although you're never too sure with WinDbg...

James

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of James Harper
> Sent: Wednesday, 26 January 2011 17:19
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: Tim Deegan
> Subject: [Xen-devel] 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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