Add serial number support for virtio_blk, V4
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Patches in v1 Applied
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/2 | Add serial number support for virtio_blk, V4hw/ hw/ sysemu.h | +66 | 0 replies | |
| 2/2 | Add serial number support for virtio_blk, V4drivers/ include/ | +45 | 4 replies |
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Cover letter [PATCH 0/2] Add serial number support for virtio_blk, V4
[Rework of earlier patch to provide additional information in the response to an ATA identify request -- virtio_blk treats the data as opaque, content created by qemu's virtio-blk. Comments from Christoph also incorporated.]
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 two patches implement the above:
qemu-vblk-serial-4.patch
which provides the qemu missing bits to interpret a '-drive .. serial=XYZ ..' flag, and:
virtio_blk-serial-4.patch
which extracts this information and makes it available to guest userspace via an HDIO_GET_IDENTITY ioctl, eg: 'hdparm -i /dev/vda'.
The above patches are relative to qemu-kvm.git and 2.6.29.3 respectively.
-john
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