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#!/bin/sh

# Detect our host arch
arch=$(arch)
test -z "$arch" && exit 0

modlist=""
case "$arch" in
    x86_64 | i686)
        kvm=/usr/bin/qemu-system-x86_64
        if grep -qs "^flags.* vmx" /proc/cpuinfo; then
            modlist="kvm_intel $KVM_NESTED"
        elif grep -qs "^flags.* svm" /proc/cpuinfo; then
            modlist="kvm_amd"
        fi
        ;;
    ppc*)
        SMT=$(/usr/sbin/ppc64_cpu --smt 2>&1 | grep "SMT=[248]")
        if [ -n "$SMT" ]
        then
          if grep -q -e '^cpu\s*:\s*POWER8'  /proc/cpuinfo; then
            echo "Error: You must disable SMT if you want to run QEMU/KVM on Power8 based ppc64le architecture"
            echo "In order to disable SMT, run: # ppc64_cpu --smt=off"
          fi
        fi
        kvm=/usr/bin/qemu-system-ppc64
        if [ "$(uname -m)" != "ppc64le" ]; then
            exit 0
        fi
        if systemd-detect-virt --quiet --vm; then
            echo "Info: second level virtualization not supported, kvm-hv load might fail"
        fi
        modlist="kvm-hv"
        ;;
esac

# Silently exit if the package isn't installed anymore
if [ -z "$kvm" -o ! -e "$kvm" ]; then
    exit 0
fi

# shellcheck disable=SC1091
[ -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 command -v systemd-detect-virt >/dev/null 2>&1; then
        systemd-detect-virt -vq && IS_VM=1
    fi

    # Enable KSM, respecting the default configuration file. If 'AUTO' is
    # set, enable only if we aren't running inside a VM.
    if [ "$KSM_ENABLED" = "1" ] || [ "$KSM_ENABLED" = "AUTO" ] && [ "$IS_VM" = "0" ]; then
        # shellcheck disable=SC2015
        [ -w /sys/kernel/mm/ksm/run ] && echo 1 > /sys/kernel/mm/ksm/run || true
        if [ -w /sys/kernel/mm/ksm/sleep_millisecs ]; then
            if [ -n "$SLEEP_MILLISECS" ]; then
                echo "$SLEEP_MILLISECS" > /sys/kernel/mm/ksm/sleep_millisecs || true
            fi
        fi
    else
        # shellcheck disable=SC2015
        [ -w /sys/kernel/mm/ksm/run ] && echo 0 > /sys/kernel/mm/ksm/run || true
    fi
}

# See how we were called.
case "$1" in
    start)
        start
    ;;

    *)
        exit 0
    ;;
esac

exit $?