[nova] Add flag to set libvirt tb_cache_size
A config option is being added in nova with [1]
in order to allow configuring lower tb-cache size
for qemu guest VMs.
This patch adds a flag in devstack so jobs can
utilize it to set required tb-cache size.
[1] https://review.opendev.org/c/openstack/nova/+/868419
Co-Authored-By: Sean Mooney <work@seanmooney.info>
Related: blueprint libvirt-tb-cache-size
Change-Id: Ifde737eb5d87dfe860445097d1f2b0ce16b0de05
diff --git a/lib/nova b/lib/nova
index ee3f29e..7c6ffb2 100644
--- a/lib/nova
+++ b/lib/nova
@@ -173,6 +173,9 @@
# Whether to use Keystone unified limits instead of legacy quota limits.
NOVA_USE_UNIFIED_LIMITS=$(trueorfalse False NOVA_USE_UNIFIED_LIMITS)
+# TB Cache Size in MiB for qemu guests
+NOVA_LIBVIRT_TB_CACHE_SIZE=${NOVA_LIBVIRT_TB_CACHE_SIZE:-0}
+
# Functions
# ---------
@@ -1071,6 +1074,9 @@
fi
if [[ "$VIRT_DRIVER" = 'libvirt' ]]; then
+ if [ ${NOVA_LIBVIRT_TB_CACHE_SIZE} -gt 0 ]; then
+ iniset $NOVA_CPU_CONF libvirt tb_cache_size ${NOVA_LIBVIRT_TB_CACHE_SIZE}
+ fi
# The group **$LIBVIRT_GROUP** is added to the current user in this script.
# ``sg`` is used in run_process to execute nova-compute as a member of the
# **$LIBVIRT_GROUP** group.