MSR_LSTAR
wrmsr(MSR_LSTAR, svm_global_hstate.lstar);
svm_vcpu_msr_allow(cpudata->msrbm, MSR_LSTAR, true, true);
svm_global_hstate.lstar = rdmsr(MSR_LSTAR);
wrmsr(MSR_LSTAR, vmx_global_hstate.lstar);
vmx_vcpu_msr_allow(cpudata->msrbm, MSR_LSTAR, true, true);
gmsr[VMX_MSRLIST_LSTAR].msr = MSR_LSTAR;
vmx_global_hstate.lstar = rdmsr(MSR_LSTAR);
wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));
wrmsr(MSR_LSTAR, (u_int64_t)IDTVEC(fast_syscall));