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RHEL-7.4 for ARM is a technical preview product, which means that we are not obligated to provide backward compatibility support for guest machine types. After team discussion, it was decided that we remove 7.4 machine type from 7.5 release. 

Note: This BZ is dedicated for the part of removing 7.4 machine type. For adding 7.5 machine type, please see BZ1498662.

We have removed 7.4 machine type in the patch posted for BZ1498662. Fix included in qemu-kvm-ma-2.10.0-3.el7.

(In reply to Wei Huang from comment #2)
> We have removed 7.4 machine type in the patch posted for BZ1498662. Fix
> included in qemu-kvm-ma-2.10.0-3.el7.

Hi Wei, 

Can we verify this bug per above?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:1104