[Xen-devel] XSAVE/XRSTOR crash resurgence in 4.3

[Ben Guthro <ben@xxxxxxxxxx>]

We (XenClient Enterprise) recently updated our mainline development to
xen 4.3, and noticed that the xsave/xrstor bug that crashes 32bit
windows guests with the driver verifier enabled has re-emerged.

From Mark Roddy:
"The DOMU crash from last nights run  has this signature in the crash dump:

Interrupt Service Routine A30BC91C has changed extended thread context.
Context saved before executing ISR: 841C4380. Context saved after
executing ISR: 841C5040.

It looks like we lost the fix for the XSAVE/XRSTOR"

However, this tree is based on 4.3-rc6, and does include the following commit:

commit 10f969150025498fe27d985f9021a68f8c7acc31
Author: Jan Beulich <jbeulich@xxxxxxxx>
Date:   Tue Jun 4 17:23:11 2013 +0200

    x86: preserve FPU selectors for 32-bit guest code



Original patch against 4.2 (that does not fail) is attached.


Ben

Attachment: x86-FPU-preserve-selectors.patch
Description: Binary data

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