segment_check
ret = segment_check(&state->segs[seg], gva, size);
ret = segment_check(&state->segs[NVMM_X64_SEG_CS], gva,
ret = segment_check(&state->segs[NVMM_X64_SEG_CS], gva,
ret = segment_check(&state->segs[seg], gva, io.size);