MSR_LSTAR
wrmsr(MSR_LSTAR, pti ? (u_int64_t)IDTVEC(fast_syscall_pti) :
svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_LSTAR);
wrmsr(MSR_LSTAR, host_msrs[IDX_MSR_LSTAR]);
host_msrs[IDX_MSR_LSTAR] = rdmsr(MSR_LSTAR);
host_msrs[IDX_MSR_LSTAR] = rdmsr(MSR_LSTAR);
guest_msr_rw(vmx, MSR_LSTAR);
wrmsr(MSR_LSTAR, vcpu->guest_msrs[IDX_MSR_LSTAR]);
vcpu->guest_msrs[IDX_MSR_LSTAR] = rdmsr(MSR_LSTAR);
wrmsr(MSR_LSTAR, host_msrs[IDX_MSR_LSTAR]);
case MSR_LSTAR: