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104 lines
3.3 KiB
Markdown
104 lines
3.3 KiB
Markdown
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# Release Documentation
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## Abstract
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This document provides guidance to users, downstream maintainers and
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any other consumers of the Cloud Hypervisor project, this document
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describes the release process, release cadence, stability expectations and
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related topics.
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## Basic Terms
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### Stability
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For Cloud Hypervisor the following areas are subject to stability guarantees:
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- [REST API](api.md#rest-api)
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- [Command line options](api.md#command-line-interface)
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- [Device Model](device_model.md)
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- Device tree, device list, ACPI, Hyper-V enlightenments and any other
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features exposed to guest
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- KVM compatibility
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- Rust edition compatibility
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This list is incomplete but this document serves as a best effort guide to stability
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across releases.
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### Experimental features
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Experimental features are under active development and no guarantees are made about their stability.
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List of experimental features:
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- TDX
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- vfio-user
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- vDPA
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### Security
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Security fixes should be included in a new point release.
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For security issues an advisory will be published via the GitHub security advisory process along with the release. Watching the project on GitHub will notify you of those issues.
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## Releases
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### Versioning
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The versioning scheme uses `MAJOR.POINT` pattern:
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- `MAJOR` can introduce incompatible changes along with support for new features. Changes to the [API](api.md#rest-api),
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[CLI options](api.md#command-line-interface) and [device model](device_model.md)
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require a notice at least 2 releases in advance for the actual change to take
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place.
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- `POINT` contains bug fixes and/or security fixes.
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### Major Release Cadence
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Cloud Hypervisor is under active development. A new major release is issued approximately
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every 6 weeks. Point releases are issued on demand, when important bug fixes are in
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the queue. A major release would receive bug fixes for the next two cycles (~12 weeks)
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and then be considered EOL.
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```
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+ - Active release support
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E - EOL
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2021 2022 2023
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18.0 | | | ++++++++E
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19.0 | | | |++++++++E
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20.0 | | | | ++++++++E
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21.0 | | | | | ++++++++E
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22.0 | | | | | +++++++++E
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23.0 | | | | | | +++++++++E
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```
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### Major Release Stability Considerations
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Snapshot/restore support is not compatible across `MAJOR` versions.
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Live migration support is not compatible across `MAJOR` versions.
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### LTS Release Cadence
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A regular release is promoted to LTS every 12 months. An LTS release is supported for 18 months. This gives a 6 months window for users to move to the new LTS.
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```
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+ - Active release support
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E - EOL
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2022 2023 2024 2025 2026
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23.0 | |+++++++++++++++++++++++++++++E
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43.0 | | | | | |+++++++++++++++++++++++++++++E
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63.0 | | | | | | | | | |+++++++++++++++++++++++++++++E
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```
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### LTS Stablity Considerations
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An LTS release is just a `MAJOR` release for which point releases are made for
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longer following the same rules for what can be backported to a `POINT` release.
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The focus lays on critical and security bug fixes which are pulled at the
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maintainer's discretion.
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