dracut/modules.d/90qemu/module-setup.sh

#!/bin/bash

# called by dracut
check() {
    if type -P systemd-detect-virt >/dev/null 2>&1; then
        vm=$(systemd-detect-virt --vm >/dev/null 2>&1)
        (($? != 0)) && return 255
        [[ $vm = "qemu" ]] && return 0
        [[ $vm = "kvm" ]] && return 0
        [[ $vm = "bochs" ]] && return 0
    fi

    for i in /sys/class/dmi/id/*_vendor; do
        [[ -f $i ]] || continue
        read vendor < $i
        [[  "$vendor" == "QEMU" ]] && return 0
        [[  "$vendor" == "Bochs" ]] && return 0
    done
    return 255
}

# called by dracut
installkernel() {
        # qemu specific modules
        hostonly='' instmods \
            ata_piix ata_generic pata_acpi cdrom sr_mod ahci \
            virtio_blk virtio virtio_ring virtio_pci \
            virtio_scsi virtio_console virtio_rng
}