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Description of problem:
If you attempt to do a old-type block migration on qemu-kvm or qemu-kvm-rhev you currently get an error like:

'unable to execute QEMU command 'migrate': this feature or command is not currently supported'

it doesn't tell the user what the error

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.  perform a migration that turns out to use qemu old school block migration; i.e. any non-shared storage on qemu-kvm or tunnelled on qemu-kvm-rhev

Actual results:
'unable to execute QEMU command 'migrate': this feature or command is not currently supported'

Expected results:
'unable to execute QEMU command 'migrate': QEMU block migration is unsupported in this version; please use shared storage or NBD based migration
(where the NBD is only displayed for -rhev)

Additional info:

Posted upstream:
block migration: Allow compile time disable

which prints:
 QEMU compiled without old-style block migration. Use drive_mirror+NBD.