At the present moment, my guest is running inside qemu and host is kvm intel, running Ubuntu 14.04, kernel is 4.3.0 stable. From within the guest, when I run "hdparm -i /dev/sdb" on the guest, I get: HDIO_GET_IDENTITY failed: Invalid argument as the error,but on the host, I will get the full harddisk/SSD info. Can I know how to resolve this so that the output is the same for both host and guest? My strace of hdparm from within the guest (just "-e ioctl" is traced): ioctl(3, HDIO_GET_MULTCOUNT, 0x618ef0) = -1 EINVAL (Invalid argument) ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[16]=[85, 08, 0e, 00, 00, 00, 01, 00, 00, 00, 00, 00, 00, 40, ec, 00], mx_sb_len=32, iovec_count=0, dxfer_len=512, timeout=15000, flags=0, data[512]=["@\0\377?7\310\20\0\0\0\0\0?\0\0\0\0\0\0\0HPAD0409105B"...], status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=184, info=0}) = 0 ioctl(3, HDIO_GET_IDENTITY, 0x7fffda088500) = -1 EINVAL (Invalid argument) HDIO_GET_IDENTITY failed: Invalid argument +++ exited with 22 +++ And at the host level: ioctl(1, SNDCTL_TMR_TIMEBASE or SNDRV_TIMER_IOCTL_NEXT_DEVICE or TCGETS, 0x7ffd4b096d90) = -1 ENOTTY (Inappropriate ioctl for device) ioctl(3, HDIO_GET_MULTCOUNT, 0x618ef0) = -1 ENOTTY (Inappropriate ioctl for device) ioctl(3, SG_IO, {'S', SG_DXFER_FROM_DEV, cmd[16]=[85, 08, 0e, 00, 00, 00, 01, 00, 00, 00, 00, 00, 00, 40, ec, 00], mx_sb_len=32, iovec_count=0, dxfer_len=512, timeout=15000, flags=0, data[512]=["@\0\377?7\310\20\0\0\0\0\0?\0\0\0\0\0\0\0HPAD0409105B"...], status=00, masked_status=00, sb[0]=[], host_status=0, driver_status=0, resid=0, duration=184, info=0}) = 0 ioctl(3, HDIO_GET_IDENTITY, 0x7ffd4b0976e0) = 0 +++ exited with 0 +++ And my qemu command line: sudo ./x86_64-softmmu/qemu-system-x86_64 -m 1024 -boot c -enable-kvm -net nic -net user \ -device virtio-scsi-pci \ -drive if=none,file=/dev/sdb,id=sdb,cache=none,format=raw \ -device scsi-block,drive=sdb \ -hda /home/user/ubuntu1404_x86_64/ubuntu1404_x86_64.img where qemu-system_x86_64 is freshly compiled from latest qemu-devel git tree. I would the SSD (internal SATA) at /dev/sdb to be pass directly into qemu. Please kindly recommend the best solution: distro (CentOS??), kernel version, qemu command like, and setup procedure for libvirtd? or virtio-scsi?