/usr/share/qemu/init/qemu-kvm-init is in qemu-system-common 1:2.5+dfsg-5ubuntu10.
This file is owned by root:root, with mode 0o755.
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 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | #!/bin/sh
# Detect our host arch
arch=`arch`
test -z "$arch" && exit 0
case "$arch" in
x86_64 | i686)
kvm=/usr/bin/qemu-system-x86_64
if grep -qs "^flags.* vmx" /proc/cpuinfo; then
modlist="kvm_intel $KVM_NESTED"
elif grep -qs "^flags.* svm" /proc/cpuinfo; then
modlist="kvm_amd"
fi
;;
ppc*)
kvm=/usr/bin/qemu-system-ppc64
if [ `uname -m` != "ppc64le" ]; then
exit 0
fi
modlist="kvm-hv"
;;
*)
# not supported on other arches
exit 0
;;
esac
# Silently exit if the package isn't installed anymore
if [ -z "$kvm" -o ! -e "$kvm" ]; then
exit 0
fi
[ -r /etc/default/qemu-kvm ] && . /etc/default/qemu-kvm
start() {
if [ -n "$modlist" ]; then
modprobe -b $modlist || true
fi
if systemd-detect-virt --quiet --container; then
mknod /dev/kvm c 10 232 || true
chown root:kvm /dev/kvm || true
chmod g+rw /dev/kvm || true
fi
# Determine if we are running inside a VM
IS_VM=0
if type systemd-detect-virt 2>&1 >/dev/null; then
systemd-detect-virt -vq && IS_VM=1
else
VM_STRINGS="KVM QEMU VMware VirtualBox Xen"
VM_DETECT="$(dmesg | egrep -e '(Hypervisor detected|Booting paravirtualized kernel)' || true)"
VM_DMIDECODE="$(cat /sys/class/dmi/id/*_vendor || true)"
VM_SEARCH="${VM_DETECT}${VM_DMIDECODE} "
for vm_string in $VM_STRINGS; do
if [ -z "${VM_SEARCH##*$vm_string*}" ]; then
IS_VM=1; break;
fi
done
fi
# Enable KSM, respecting the default configuration file. If 'AUTO' is
# set, enable only if we aren't running inside a VM.
if [ "$KSM_ENABLED" = "1" -o \( "$KSM_ENABLED" = "AUTO" -a "$IS_VM" = "0" \) ]; then
[ -w /sys/kernel/mm/ksm/run ] && echo 1 > /sys/kernel/mm/ksm/run || true
if [ -w /sys/kernel/mm/ksm/sleep_millisecs ]; then
if [ -n "$SLEEP_MILLISECS" ]; then
echo "$SLEEP_MILLISECS" > /sys/kernel/mm/ksm/sleep_millisecs || true
fi
fi
else
[ -w /sys/kernel/mm/ksm/run ] && echo 0 > /sys/kernel/mm/ksm/run || true
fi
# If /etc/default/qemu-kvm says to, load vhost_net. Default is not to.
if [ "$VHOST_NET_ENABLED" = "1" ]; then
modprobe -b vhost_net || true
fi
# mount hugepages if available and requested
if [ "x$KVM_HUGEPAGES" = "x1" ]; then
if ! grep -q hugetlbfs /proc/filesystems; then
logger -t qemu-kvm "Error: hugepages not available in the kernel!"
elif grep -q /run/hugepages/kvm /proc/mounts; then
logger -t qemu-kvm "/run/hugepages/kvm already mounted"
elif ! getent group kvm > /dev/null 2>&1; then
logger -t qemu-kvm "Error: group kvm does not exist!"
else
mkdir -p /run/hugepages/kvm
mount -t hugetlbfs hugetlbfs-kvm -o mode=775,gid=kvm /run/hugepages/kvm
fi
fi
}
# See how we were called.
case "$1" in
start)
start
;;
*)
exit 0
;;
esac
exit $?
|