perf_guest_switch_msr  258 arch/x86/include/asm/perf_event.h extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr);
perf_guest_switch_msr  262 arch/x86/include/asm/perf_event.h static inline struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr)