Description
If a KVM VM has so many scsi devices that sdz is already in use, the next name would be sdaa. This works when creating the VM from scratch, but it fails if one uses live disk-attach (from sunstone or from cmdline).

To Reproduce
Add scsi disks until sdz is in use, make sure VM runs and live add another one. Log will show that it would get wrong bus addr (same as sda). Looking at the code one clearly sees that it only queries one char after sd and simply ignores all others.

Expected behavior
It should properly calculate values > 25 (e.g. sdz -> 25; sdaa -> 26)

Details

• Affected Component: vmm_mad/remotes/kvm
• Hypervisor: KVM
• Version: ONE 7.0.0

Additional context
I will add a PR soon.

Also note: The original code did not handle any error/warning cases, like e.g. emit a message if a device is specified which has extra chars or leads to a bus address which is too high. So i did not add any as well.

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)