[Xen-devel] Fix for BSOD when "migrating" from Intel to AMD.

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

The Intel processor driver for Windows (XP and later at least) reads an
MSR that AMD doesn't have. This causes GP-fault in kernel mode, which
causes blue-screen-of-death on Windows. This prevents a disk-image that
was installed on Intel from starting on an AMD processor.

This patch "fixes" the problem by allowing reads from the msr, returning
all zero's (which is a valid, if not particulary meaningfull, value for
this register). 

It raises some interesting questions on compatibility and how to make
migration more reliable - migration in this case being either by
installation on one machine and restarting on another or by actual use
of the "xm migrate" command. I will post a separate mail on this
subject.

Signed off by: Mats Petersson (mats.petersson@xxxxxxx)

Applies to unstable c/s: 15249. Please apply.

--
Mats

Attachment: patch.fix_XP_bsod_when_install_on_intel
Description: patch.fix_XP_bsod_when_install_on_intel

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