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From: "James Harper" <james.harper@bendigoit.com.au>
To: xen-devel@lists.xensource.com
Cc: Tim Deegan <Tim.Deegan@citrix.com>
Subject: RE: AMD crash on restore. bug in MTRR restore. 4.0.2-rc2-pre
Date: Thu, 27 Jan 2011 13:31:53 +1100	[thread overview]
Message-ID: <AEC6C66638C05B468B556EA548C1A77D01BB92AD@trantor> (raw)
In-Reply-To: <AEC6C66638C05B468B556EA548C1A77D01BB928D@trantor>

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@lists.xensource.com [mailto:xen-devel-
> bounces@lists.xensource.com] On Behalf Of James Harper
> Sent: Wednesday, 26 January 2011 17:19
> To: xen-devel@lists.xensource.com
> 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
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

  reply	other threads:[~2011-01-27  2:31 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-26  6:18 AMD crash on restore. bug in MTRR restore. 4.0.2-rc2-pre James Harper
2011-01-27  2:31 ` James Harper [this message]
2011-01-27  3:49   ` AMD crash on restore. bug in MTRR restore.4.0.2-rc2-pre James Harper
2011-01-27  8:51     ` Jan Beulich
2011-01-29  6:39     ` Wei Huang

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