As far as I can see, the issue has been fixed here:
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=8018dc63aab936f1a5
... so closing this ticket now.
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/788697
Title:
[PowerPC] [patch] mtmsr does not preserve high bits of MSR
Status in QEMU:
Fix Released
Bug description:
The mtmsr instruction on 64-bit PPC does not preserve the high-order
32-bits of the MSR the way it is supposed to, instead setting them to
0, which takes 64-bit code out of 64-bit mode. There is some code that
does the right thing, but it brokenly only preserves these bits when
the thread is not in 64-bit mode (i.e. when it doesn't matter). The
attached patch unconditionally enables this code when TARGET_PPC64 is
set, per the ISA spec, which fixes early boot failures trying to start
FreeBSD/powerpc64 under qemu.
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