diff --git a/99-grub-mkconfig.install b/99-grub-mkconfig.install
index e370899..339b3c7 100755
--- a/99-grub-mkconfig.install
+++ b/99-grub-mkconfig.install
@@ -4,10 +4,30 @@ if ! [[ $KERNEL_INSTALL_MACHINE_ID ]]; then
     exit 0
 fi
 
-ARCH=$(uname -m)
+# PV and PVH Xen DomU guests boot with pygrub that doesn't have BLS support,
+# also Xen Dom0 use the menuentries from 20_linux_xen and not the ones from
+# 10_linux. So BLS support needs to be disabled for both Xen Dom0 and DomU.
+if [[ -e /sys/hypervisor/type ]] && grep -q "^xen$" /sys/hypervisor/type; then
+    RUN_MKCONFIG=true
+    DISABLE_BLS=true
+fi
 
-# Is only needed for ppc64* since we can't assume a BLS capable bootloader there
-if [[ $ARCH != "ppc64" && $ARCH != "ppc64le" ]]; then
+ARCH=$(uname -m)
+# Older ppc64le OPAL firmware don't have BLS support so grub2-mkconfig has to
+# be run to generate a GRUB config file that contains menuentry commands.
+if [[ $ARCH = "ppc64le" ]]; then
+    RUN_MKCONFIG=true
+fi
+
+if [[ $DISABLE_BLS = "true" ]]; then
+    if grep -q '^GRUB_ENABLE_BLSCFG="*true"*\s*$' /etc/default/grub; then
+	sed -i 's/^GRUB_ENABLE_BLSCFG=.*/GRUB_ENABLE_BLSCFG=false/' /etc/default/grub
+    fi
+fi
+
+# A traditional grub configuration file needs to be generated only in the case when
+# the bootloaders are not capable of populating a menu entry from the BLS fragments.
+if [[ $RUN_MKCONFIG != "true" ]]; then
     exit 0
 fi