[libvirt-users] Advice on virtio, or any virtualization solution for hdparm

[Peter Teoh]

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?
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