MSR_AMD_LSTAR
wrmsr(MSR_AMD_LSTAR,
wrmsr(MSR_AMD_LSTAR,
wrmsr(MSR_AMD_LSTAR, (uintptr_t)xpv_panic_hypercall);
wrmsr(MSR_AMD_LSTAR, (uintptr_t)tr_brand_sys_syscall);
wrmsr(MSR_AMD_LSTAR, (uintptr_t)brand_sys_syscall);
wrmsr(MSR_AMD_LSTAR, (uintptr_t)tr_sys_syscall);
wrmsr(MSR_AMD_LSTAR, (uintptr_t)sys_syscall);