[Cosmetic changes to prior version, documentation
added to individual patches.]
This patch allows passing of a virtio_blk drive
serial number from qemu into a guest's virtio_blk
driver, and provides a means to access the serial
number from a guest's userspace.
Equivalent functionality currently exists for IDE
and SCSI, however it is not yet implemented for
virtio. Scenarios exist where guest code relies
on a unique drive serial number to correctly
identify the machine environment in which it
exists. The following patches, relative to
qemu-kvm.git and 2.6.29.3 respectively, provide
an equivalent mechanism for virtio_blk.
Usage:
With a patched qemu and guest virtio_blk driver,
launch the guest with a virtio_blk drive specifying
a serial number, eg:
-drive ... ,if=virtio,serial=ThisSpace4Rent, ...
In the guest retrieve via HDIO_GET_IDENTITY ioctl
to the virtio_blk driver, (eg):
# hdparm -i /dev/vda
hdparm -i /dev/vda
/dev/vda:
Model=QEMU VIRT_BLK, FwRev=0.10.50, SerialNo=ThisSpace4Rent
-john
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