First commit, at K18-2 Control Center.

roles/kernel-ml/files/grub

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+GRUB_TIMEOUT=5
+GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
+GRUB_DEFAULT=saved
+GRUB_DISABLE_SUBMENU=true
+GRUB_TERMINAL="serial console"
+GRUB_SERIAL_COMMAND="serial --speed=115200"
+GRUB_CMDLINE_LINUX="crashkernel=auto console=ttyS0,115200 intel_iommu=on iommu=pt pci=realloc,assign-busses"
+GRUB_DISABLE_RECOVERY="true"

roles/kernel-ml/tasks/main.yml

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+---
+- name: "copy framework rpms to destination server"
+  synchronize:
+    src: "{{ role_path }}/files/"
+    dest: "/tmp/ansible_deploy/"
+
+- name: "install kernels-ml"
+  yum:
+    name:
+      - /tmp/ansible_deploy/pkgconfig-0.27.1-4.el7.x86_64.rpm
+      - /tmp/ansible_deploy/zlib-devel-1.2.7-17.el7.x86_64.rpm
+      - /tmp/ansible_deploy/elfutils-libelf-devel-0.168-8.el7.x86_64.rpm
+      - /tmp/ansible_deploy/kernel/kernel-ml-5.1.8-1.el7.elrepo.x86_64.rpm
+      - /tmp/ansible_deploy/kernel/kernel-ml-devel-5.1.8-1.el7.elrepo.x86_64.rpm
+      - /tmp/ansible_deploy/dkms-2.7.1-1.el7.noarch.rpm
+    state: present
+  register: t_kernel_ml
+
+- name: "set kernel-ml as default kernel"
+  command: /usr/sbin/grub2-set-default 0
+  when: t_kernel_ml.changed
+
+- name: "copy /etc/default/grub"
+  copy:
+    src: "{{ role_path }}/files/grub"
+    dest: "/etc/default"
+  when: 
+    - tsg_access_type == 4
+    - t_kernel_ml.changed
+
+- name: "BIOS:grub2-mkconfig"
+  shell: grub2-mkconfig -o /boot/grub2/grub.cfg
+  when:
+    - tsg_access_type == 4
+    - t_kernel_ml.changed
+
+- name: "UEFI:grub2-mkconfig"
+  shell: grub2-mkconfig  -o /boot/efi/EFI/centos/grub.cfg
+  when:
+    - tsg_access_type == 4
+    - t_kernel_ml.changed
+
+#- name: "reboot"
+#  reboot:
+#  when: t_kernel_ml.changed