/etc/default/qemu-kvm is in qemu-system-common 1:2.11+dfsg-1ubuntu7.
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 | # Set to 1 to enable KSM, 0 to disable KSM, and AUTO to use default settings.
# After changing this setting restart the qemu-kvm service.
KSM_ENABLED=AUTO
SLEEP_MILLISECS=200
# Dropped VHOST_NET_ENABLED as this is auto-loaded in recent kernels
# it still works, but is deprecated and will be removed in a later version
# Dropped KVM_HUGEPAGES as systemd provides feasible hugepage moutpoints
# it still works, but is deprecated and will be removed in a later version
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