MIPS_CPU_PERF
# define cpu_has_perf __opt(MIPS_CPU_PERF)
#define cpu_guest_has_perf (cpu_data[0].guest.options & MIPS_CPU_PERF)
#define cpu_guest_has_dyn_perf (cpu_data[0].guest.options_dyn & MIPS_CPU_PERF)
c->options |= MIPS_CPU_PERF;
c->guest.options |= MIPS_CPU_PERF;
c->guest.options_dyn |= MIPS_CPU_PERF;