diff --git a/manifests/compute/libvirt.pp b/manifests/compute/libvirt.pp
index b1c8d5431..f2bc9771f 100644
--- a/manifests/compute/libvirt.pp
+++ b/manifests/compute/libvirt.pp
@@ -229,6 +229,10 @@
 #   reboot request is made.
 #   Defaults to $facts['os_service_default']
 #
+# [*tb_cache_size*]
+#   (optional) The tb-cache size (in MiB) of each guest VM.
+#   Defaults to $facts['os_service_default']
+#
 class nova::compute::libvirt (
   $ensure_package                             = 'present',
   $virt_type                                  = 'kvm',
@@ -274,6 +278,7 @@ class nova::compute::libvirt (
   $max_queues                                 = $facts['os_service_default'],
   $num_memory_encrypted_guests                = $facts['os_service_default'],
   $wait_soft_reboot_seconds                   = $facts['os_service_default'],
+  $tb_cache_size                              = $facts['os_service_default'],
 ) inherits nova::params {
 
   include nova::deps
@@ -376,6 +381,7 @@ class nova::compute::libvirt (
     'libvirt/max_queues':                    value => $max_queues;
     'libvirt/num_memory_encrypted_guests':   value => $num_memory_encrypted_guests;
     'libvirt/wait_soft_reboot_seconds':      value => $wait_soft_reboot_seconds;
+    'libvirt/tb_cache_size':                 value => $tb_cache_size;
   }
 
   # cpu_model param is only valid if cpu_mode=custom
diff --git a/releasenotes/notes/tb_cache_size-68e4d02b579a4a50.yaml b/releasenotes/notes/tb_cache_size-68e4d02b579a4a50.yaml
new file mode 100644
index 000000000..5bda07aea
--- /dev/null
+++ b/releasenotes/notes/tb_cache_size-68e4d02b579a4a50.yaml
@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    The new ``nova::compute::libvirt::tb_cache_size`` parameter has been added.
diff --git a/spec/classes/nova_compute_libvirt_spec.rb b/spec/classes/nova_compute_libvirt_spec.rb
index 5149ddf97..59acff028 100644
--- a/spec/classes/nova_compute_libvirt_spec.rb
+++ b/spec/classes/nova_compute_libvirt_spec.rb
@@ -81,6 +81,7 @@ describe 'nova::compute::libvirt' do
       it { is_expected.to contain_nova_config('libvirt/max_queues').with_value('<SERVICE DEFAULT>')}
       it { is_expected.to contain_nova_config('libvirt/num_memory_encrypted_guests').with_value('<SERVICE DEFAULT>')}
       it { is_expected.to contain_nova_config('libvirt/wait_soft_reboot_seconds').with_value('<SERVICE DEFAULT>')}
+      it { is_expected.to contain_nova_config('libvirt/tb_cache_size').with_value('<SERVICE DEFAULT>')}
     end
 
     describe 'with params' do
@@ -124,6 +125,7 @@ describe 'nova::compute::libvirt' do
           :max_queues                                 => 4,
           :num_memory_encrypted_guests                => 255,
           :wait_soft_reboot_seconds                   => 120,
+          :tb_cache_size                              => 32,
         }
       end
 
@@ -166,6 +168,7 @@ describe 'nova::compute::libvirt' do
       it { is_expected.to contain_nova_config('libvirt/max_queues').with_value(4)}
       it { is_expected.to contain_nova_config('libvirt/num_memory_encrypted_guests').with_value(255)}
       it { is_expected.to contain_nova_config('libvirt/wait_soft_reboot_seconds').with_value(120)}
+      it { is_expected.to contain_nova_config('libvirt/tb_cache_size').with_value(32)}
 
       it {
         is_expected.to contain_service('libvirt').with(