vm_get_seg_desc
int vm_get_seg_desc(struct vcpu *vcpu, int reg, struct seg_desc *seg_desc);
int vm_get_seg_desc(struct vm *vm, int vcpu, int reg,
error = vm_get_seg_desc(vm, vcpuid, seg, &desc);
error = vm_get_seg_desc(vm, vcpuid, VM_REG_GUEST_SS, &ss_desc);
error = vm_get_seg_desc(vm, vcpuid, VM_REG_GUEST_CS, &cs_desc);
error = vm_get_seg_desc(vm, cpuid, seg, &desc);
error = vm_get_seg_desc(sc->vmm_vm, vcpu, vmsegd.regnum,