From what I've read...
No. From a file, yes. From a partition: No.
Any block device. It does not have to do with iSCSI or SCSI or anything like that in particular. It's any block device on a storage device that uses SCSI subsystem, which is going to be most things. That means whole disks, partitions, and logical volumes on most storage devices (such as SATA drives) are vulnerable.
On my KVM virtual machines I use LVM because of the performance advantage of using block devices directly rather then through file-backed storage.
This bug is a bit disheartening.
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