Add save/restore support to the LSI logic SCSI device model.
This patch requires "Handle BH's queued by AIO completions in
qemu_aio_flush()" to work reliably. The combination of those two
patches survived 300+ migrations with heavy IO load running in the
guest.
Signed-off-by: Nolan Leake <nolan <at> sigbus.net>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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