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H A Dhelper_regs.cdiff 678b6f1af75ef42f510495a81fe8562e872e9daf Tue Jun 13 09:16:23 CDT 2023 Nicholas Piggin <npiggin@gmail.com> target/ppc: Prevent supervisor from modifying MSR[ME]

Prevent guest state modifying the MSR[ME] bit. Per ISA:

An attempt to modify MSR[ME] in privileged but non-hypervisor state
is ignored (i.e., the bit is not changed).

Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>