MSR_CSTAR
wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
svm_msr_rw_ok(svm_sc->msr_bitmap, MSR_CSTAR);
wrmsr(MSR_CSTAR, host_msrs[IDX_MSR_CSTAR]);
host_msrs[IDX_MSR_CSTAR] = rdmsr(MSR_CSTAR);
host_msrs[IDX_MSR_CSTAR] = rdmsr(MSR_CSTAR);
guest_msr_rw(vmx, MSR_CSTAR);
wrmsr(MSR_CSTAR, vcpu->guest_msrs[IDX_MSR_CSTAR]);
vcpu->guest_msrs[IDX_MSR_CSTAR] = rdmsr(MSR_CSTAR);
wrmsr(MSR_CSTAR, host_msrs[IDX_MSR_CSTAR]);
case MSR_CSTAR: