/etc/default/qemu-kvm is in qemu-kvm 1.0+noroms-0ubuntu13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | # To disable qemu-kvm's page merging feature, set KSM_ENABLED=0 and
# sudo restart qemu-kvm
KSM_ENABLED=1
SLEEP_MILLISECS=200
# To load the vhost_net module, which in some cases can speed up
# network performance, set VHOST_NET_ENABLED to 1.
VHOST_NET_ENABLED=0
# By default, enable nested kvm for intel cpus. (AMD cpus always have
# it enabled). If you want to disable nested kvm, comment the first
# line and uncomment the second.
KVM_NESTED=" nested=1"
#KVM_NESTED=""
# Uncomment this if you want to specify a bridge for qemu-ifup to use
# for tap devices
#TAPBR=virbr0
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