MSR_CSTAR
wrmsr(MSR_CSTAR, svm_global_hstate.cstar);
svm_vcpu_msr_allow(cpudata->msrbm, MSR_CSTAR, true, true);
svm_global_hstate.cstar = rdmsr(MSR_CSTAR);
wrmsr(MSR_CSTAR, vmx_global_hstate.cstar);
vmx_vcpu_msr_allow(cpudata->msrbm, MSR_CSTAR, true, true);
gmsr[VMX_MSRLIST_CSTAR].msr = MSR_CSTAR;
vmx_global_hstate.cstar = rdmsr(MSR_CSTAR);
wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));
wrmsr(MSR_CSTAR, (u_int64_t)IDTVEC(fast_syscall32));