MSR_KERNELGSBASE
wrmsr(MSR_KERNELGSBASE, 0);
gsb = rdmsr(MSR_KERNELGSBASE);
(void *)rdmsr(MSR_GSBASE), (void *)rdmsr(MSR_KERNELGSBASE));
svm_setmsrbrw(vcpu, MSR_KERNELGSBASE);
msr_store[VCPU_HOST_REGS_KGSBASE].vms_index = MSR_KERNELGSBASE;
msr_store[VCPU_REGS_KGSBASE].vms_index = MSR_KERNELGSBASE;
vmx_setmsrbrw(vcpu, MSR_KERNELGSBASE);
rdmsr(MSR_KERNELGSBASE);
case MSR_KERNELGSBASE: return "KGSBASE";