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Description of problem:
kvm.conf is currently x86 specific

Steps to Reproduce:
1. cat kvm.conf

Actual results:

# Setting modprobe kvm_intel/kvm_amd nested = 1
# only enables Nested Virtualization until the next reboot or
# module reload. Uncomment the option applicable
# to your system below to enable the feature permanently.
#
# User changes in this file are preserved across upgrades.
#
# For Intel
#options kvm_intel nested=1
#
# For AMD
#options kvm_amd nested=1

Expected results:

# Setting modprobe kvm nested = 1
# only enables Nested Virtualization until the next reboot or
# module reload. Uncomment the option applicable
# to your system below to enable the feature permanently.
#
# User changes in this file are preserved across upgrades.
#
#options kvm nested=1

Fix included in qemu-kvm-ma-2.10.0-7.el7

Reproduced on qemu-kvm-ma-2.10.0-6.el7.s390x: 

# cat /etc/modprobe.d/kvm.conf 
# Setting modprobe kvm_intel/kvm_amd nested = 1
# only enables Nested Virtualization until the next reboot or
# module reload. Uncomment the option applicable
# to your system below to enable the feature permanently.
#
# User changes in this file are preserved across upgrades.
#
# For Intel
#options kvm_intel nested=1
#
# For AMD
#options kvm_amd nested=1

Verified pass on qemu-kvm-ma-2.10.0-7.el7.s390x:

# cat /etc/modprobe.d/kvm.conf 
# Setting "modprobe kvm nested=1" only enables Nested Virtualization until
# the next reboot or module reload. Uncomment the option below to enable
# the feature permanently.
#
# User changes in this file are preserved across upgrades.
#
#options kvm nested=1

Setting to VERIFIED.

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/RHBA-2018:0831