Add qemu kernel modules, if we detect a qemu instance

Regardless of the host-only setting, add all know kernel driver for qemu
instances to support changing the virtual hardware.

dracut.spec

@@ -271,6 +271,7 @@ rm -rf $RPM_BUILD_ROOT
 %{dracutlibdir}/modules.d/90lvm
 %{dracutlibdir}/modules.d/90mdraid
 %{dracutlibdir}/modules.d/90multipath
+%{dracutlibdir}/modules.d/90qemu
 %{dracutlibdir}/modules.d/91crypt-gpg
 %{dracutlibdir}/modules.d/95debug
 %{dracutlibdir}/modules.d/95resume
@@ -313,6 +314,7 @@ rm -rf $RPM_BUILD_ROOT
 %{dracutlibdir}/modules.d/95fcoe
 %{dracutlibdir}/modules.d/95iscsi
 %{dracutlibdir}/modules.d/90livenet
+%{dracutlibdir}/modules.d/90qemu-net
 %{dracutlibdir}/modules.d/95nbd
 %{dracutlibdir}/modules.d/95nfs
 %{dracutlibdir}/modules.d/95ssh-client

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

@@ -0,0 +1,16 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+check() {
+    vm=$(systemd-detect-virt --vm &>/dev/null)
+    (($? != 0)) && return 255
+    [[ $vm = "qemu" ]] && return 0
+    [[ $vm = "kvm" ]] && return 0
+    return 255
+}
+
+installkernel() {
+    # qemu specific modules
+    hostonly='' instmods virtio_net e1000 8139cp pcnet32 e100 ne2k_pci
+}

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

@@ -0,0 +1,16 @@
+#!/bin/bash
+# -*- mode: shell-script; indent-tabs-mode: nil; sh-basic-offset: 4; -*-
+# ex: ts=8 sw=4 sts=4 et filetype=sh
+
+check() {
+    vm=$(systemd-detect-virt --vm &>/dev/null)
+    (($? != 0)) && return 255
+    [[ $vm = "qemu" ]] && return 0
+    [[ $vm = "kvm" ]] && return 0
+    return 255
+}
+
+installkernel() {
+        # qemu specific modules
+        hostonly='' instmods virtio_blk virtio virtio_ring virtio_pci ata_piix ata_generic pata_acpi cdrom sr_mod ahci virtio_scsi
+}