pre-update-prepare
==================

.. _pre-update-prepare_compute-tsx:

compute-tsx
-----------

RHEL8.x kernel flag for Compute nodes validation.

RHEL-8.3 kernel disabled the Intel TSX (Transactional
Synchronization Extensions) feature by default as a preemptive
security measure, but it breaks live migration from RHEL-7.9
(or even RHEL-8.1 or RHEL-8.2) to RHEL-8.3.

Operators are expected to explicitly define the TSX flag in
their KernelArgs for the compute role to prevent live-migration
issues during the upgrade process.

This also impacts upstream CentOS systems.


- **hosts**: nova_libvirt
- **groups**: pre-upgrade, pre-system-upgrade, pre-overcloud-prepare, pre-overcloud-upgrade, pre-overcloud-converge, pre-update, pre-update-prepare, pre-update-run, pre-update-converge
- **parameters**:

  - **compute_tsx_debug**: False

  - **compute_tsx_warning**: False
- **roles**: compute_tsx

Role documentation

.. toctree::

   roles/role-compute_tsx
