MSR_LSTAR
wrmsr(MSR_LSTAR, (uint64_t)Xsyscall);
wrmsr(MSR_LSTAR, (uint64_t)Xsyscall_svs);
wrmsr(MSR_LSTAR, cpudata->lstar);
svm_vcpu_msr_allow(cpudata->msrbm, MSR_LSTAR, true, true);
cpudata->lstar = rdmsr(MSR_LSTAR);
wrmsr(MSR_LSTAR, cpudata->lstar);
vmx_vcpu_msr_allow(cpudata->msrbm, MSR_LSTAR, true, true);
gmsr[VMX_MSRLIST_LSTAR].msr = MSR_LSTAR;
cpudata->lstar = rdmsr(MSR_LSTAR);