2.5.6.6.3: add configuration change event

This adds an event for changes to LUN parameters, for example capacity.  These
are reported in virtio-blk via configuration changes, and we want a similar
functionality in virtio-scsi too.

There is no list of supported parameter changes, instead we just refer to
the list of sense codes in the SCSI specification.

This event will usually be serviced in one of three ways: 1) call an OS
service to revalidate the disk, either always or only for some specific
sense codes; 2) somehow pass the sense directly to the upper-level driver;
3) inject a TEST UNIT READY command into the upper-level device, so that
the OS will see the unit attention code and react.  Of course a mix of
the three is also possible, depending on how the driver writer prefers
to have his layering violations served.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

See: https://lists.oasis-open.org/archives/virtio-comment/201308/msg00032.html
Signed-off-by: Rusty Russell <rusty@au1.ibm.com>

git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@30 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652

0 files changed, 0 insertions, 0 deletions