diff --git a/manifests/compute/libvirt.pp b/manifests/compute/libvirt.pp
index a495386d9..e39eefbcc 100644
--- a/manifests/compute/libvirt.pp
+++ b/manifests/compute/libvirt.pp
@@ -147,6 +147,10 @@
 #   Valid values are 256, 512, 1024
 #   Defaults to $::os_service_default
 #
+# [*file_backed_memory*]
+#   (optional) Available capacity in MiB for file-backed memory.
+#   Defaults to $::os_service_default
+#
 class nova::compute::libvirt (
   $ensure_package                             = 'present',
   $libvirt_virt_type                          = 'kvm',
@@ -175,6 +179,7 @@ class nova::compute::libvirt (
   $log_outputs                                = undef,
   $rx_queue_size                              = $::os_service_default,
   $tx_queue_size                              = $::os_service_default,
+  $file_backed_memory                         = undef,
 ) inherits nova::params {
 
   include ::nova::deps
@@ -256,6 +261,7 @@ class nova::compute::libvirt (
     'libvirt/enabled_perf_events':   value => join(any2array($libvirt_enabled_perf_events), ',');
     'libvirt/rx_queue_size':         value => $rx_queue_size;
     'libvirt/tx_queue_size':         value => $tx_queue_size;
+    'libvirt/file_backed_memory':    value => $file_backed_memory;
   }
 
   # cpu_model param is only valid if cpu_mode=custom
diff --git a/manifests/compute/libvirt/qemu.pp b/manifests/compute/libvirt/qemu.pp
index e4893f900..5400e2c23 100644
--- a/manifests/compute/libvirt/qemu.pp
+++ b/manifests/compute/libvirt/qemu.pp
@@ -28,13 +28,19 @@
 #   (optional) Enables TLS client cert verification when vnc_tls is enabled.
 #   Defaults to true.
 #
+# [*memory_backing_dir*]
+#   (optional) This directory is used for memoryBacking source if configured as file.
+#   NOTE: big files will be stored here
+#   Defaults to undef.
+#
 class nova::compute::libvirt::qemu(
-  $configure_qemu = false,
-  $group          = undef,
-  $max_files      = 1024,
-  $max_processes  = 4096,
-  $vnc_tls        = false,
-  $vnc_tls_verify = true
+  $configure_qemu     = false,
+  $group              = undef,
+  $max_files          = 1024,
+  $max_processes      = 4096,
+  $vnc_tls            = false,
+  $vnc_tls_verify     = true,
+  $memory_backing_dir = undef
 ){
 
   include ::nova::deps
@@ -68,7 +74,12 @@ class nova::compute::libvirt::qemu(
     } else {
       $augues_group_changes = []
     }
-    $augues_changes = concat($augues_changes_default, $augues_group_changes)
+    if $memory_backing_dir and !empty($memory_backing_dir) {
+      $augues_memory_backing_dir_changes = ["set memory_backing_dir ${memory_backing_dir}"]
+    } else {
+      $augues_memory_backing_dir_changes = []
+    }
+    $augues_changes = concat($augues_changes_default, $augues_group_changes, $augues_memory_backing_dir_changes)
 
     augeas { 'qemu-conf-limits':
       context => '/files/etc/libvirt/qemu.conf',
@@ -83,7 +94,8 @@ class nova::compute::libvirt::qemu(
         'rm max_processes',
         'rm group',
         'rm vnc_tls',
-        'rm vnc_tls_x509_verify'
+        'rm vnc_tls_x509_verify',
+        'rm memory_backing_dir'
       ],
       tag     => 'qemu-conf-augeas',
     }
diff --git a/releasenotes/notes/nova_file_backed_memory_and_memory_backing_dir_support_for_qemu-a4cde7ab5297f3ac.yaml b/releasenotes/notes/nova_file_backed_memory_and_memory_backing_dir_support_for_qemu-a4cde7ab5297f3ac.yaml
new file mode 100644
index 000000000..e2dd46853
--- /dev/null
+++ b/releasenotes/notes/nova_file_backed_memory_and_memory_backing_dir_support_for_qemu-a4cde7ab5297f3ac.yaml
@@ -0,0 +1,18 @@
+---
+features:
+  - |
+    Add nova file_backed_memory and memory_backing_dir support for qemu.conf
+
+    The libvirt driver now allows utilizing file backed memory for qemu/KVM
+    virtual machines, via a new configuration attribute
+    ``[libvirt]/file_backed_memory``, defaulting to 0 (disabled).
+
+    ``[libvirt]/file_backed_memory`` specifies the available capacity in MiB
+    for file backed memory, at the directory configured for
+    ``memory_backing_dir`` in libvirt's ``qemu.conf``. When enabled, the
+    libvirt driver will report the configured value for the total memory
+    capacity of the node, and will report used memory as the sum of all
+    configured guest memory.
+
+    Running Nova with file_backed_memory requires libvirt version 4.0.0 and
+    qemu version 2.6.0
diff --git a/spec/classes/nova_compute_libvirt_qemu_spec.rb b/spec/classes/nova_compute_libvirt_qemu_spec.rb
index 2494a5b54..3d35e674f 100644
--- a/spec/classes/nova_compute_libvirt_qemu_spec.rb
+++ b/spec/classes/nova_compute_libvirt_qemu_spec.rb
@@ -18,7 +18,7 @@ describe 'nova::compute::libvirt::qemu' do
       end
       it { is_expected.to contain_augeas('qemu-conf-limits').with({
         :context => '/files/etc/libvirt/qemu.conf',
-        :changes => [ "rm max_files", "rm max_processes", "rm group", "rm vnc_tls", "rm vnc_tls_x509_verify" ],
+        :changes => [ "rm max_files", "rm max_processes", "rm group", "rm vnc_tls", "rm vnc_tls_x509_verify", "rm memory_backing_dir" ],
       }).that_notifies('Service[libvirt]') }
     end
 
@@ -57,6 +57,7 @@ describe 'nova::compute::libvirt::qemu' do
           :group => 'openvswitch',
           :max_files => 32768,
           :max_processes => 131072,
+          :memory_backing_dir => '/tmp'
         }
       end
       it { is_expected.to contain_augeas('qemu-conf-limits').with({
@@ -66,7 +67,8 @@ describe 'nova::compute::libvirt::qemu' do
             "set max_processes 131072",
             "set vnc_tls 0",
             "set vnc_tls_x509_verify 0",
-            "set group openvswitch"
+            "set group openvswitch",
+            "set memory_backing_dir /tmp"
         ],
         :tag     => 'qemu-conf-augeas',
       }).that_notifies('Service[libvirt]') }