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docs: Create hypervisor summary document
Split some of the core hypervisor details out of the virtualisation document and present in a simpler fashion for new users. Fixes: #1063. Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
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@ -41,14 +41,9 @@ Each hypervisor or VMM varies on how or if it handles each of these.
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## Kata Containers Hypervisor and VMM support
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Kata Containers is designed to support multiple virtual machine monitors (VMMs) and hypervisors.
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Kata Containers supports:
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- [ACRN hypervisor](https://projectacrn.org/)
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- [Cloud Hypervisor](https://github.com/cloud-hypervisor/cloud-hypervisor)/[KVM](https://www.linux-kvm.org/page/Main_Page)
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- [Firecracker](https://github.com/firecracker-microvm/firecracker)/KVM
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- [QEMU](http://www.qemu-project.org/)/KVM
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Kata Containers [supports multiple hypervisors](../hypervisors.md).
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Which configuration to use will depend on the end user's requirements. Details of each solution and a summary are provided below.
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Details of each solution and a summary are provided below.
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### QEMU/KVM
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68
docs/hypervisors.md
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68
docs/hypervisors.md
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# Hypervisors
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* [Hypervisors](#hypervisors)
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* [Introduction](#introduction)
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* [Types](#types)
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* [Determine currently configured hypervisor](#determine-currently-configured-hypervisor)
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* [Choose a Hypervisor](#choose-a-hypervisor)
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## Introduction
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Kata Containers supports multiple hypervisors. This document provides a very
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high level overview of the available hypervisors, giving suggestions as to
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which hypervisors you may wish to investigate further.
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> **Note:**
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>
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> This document is not prescriptive or authoritative:
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>
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> - It is up to you to decide which hypervisors may be most appropriate for
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> your use-case.
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> - Refer to the official documentation for each hypervisor for further details.
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## Types
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Since each hypervisor offers different features and options, Kata Containers
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provides a separate
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[configuration file](/src/runtime/README.md#configuration)
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for each. The configuration files contain comments explaining which options
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are available, their default values and how each setting can be used.
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> **Note:**
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>
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> The simplest way to switch between hypervisors is to create a symbolic link
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> to the appropriate hypervisor-specific configuration file.
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| Hypervisor | Written in | Architectures | Type | Configuration file |
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|-|-|-|-|-|
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[ACRN] | C | `x86_64` | Type 1 (bare metal) | `configuration-acrn.toml` |
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[Cloud Hypervisor] | rust | `aarch64`, `x86_64` | Type 2 ([KVM]) | `configuration-clh.toml` |
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[Firecracker] | rust | `aarch64`, `x86_64` | Type 2 ([KVM]) | `configuration-fc.toml` |
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[QEMU] | C | all | Type 2 ([KVM]) | `configuration-qemu.toml` |
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## Determine currently configured hypervisor
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```bash
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$ kata-runtime kata-env | awk -v RS= '/\[Hypervisor\]/' | grep Path
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```
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## Choose a Hypervisor
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The table below provides a brief summary of some of the differences between
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the hypervisors:
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| Hypervisor | Summary | Features | Limitations | Container Creation speed | Memory density | Use cases | Comment |
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|-|-|-|-|-|-|-|-|
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[ACRN] | Safety critical and real-time workloads | | | excellent | excellent | Embedded and IOT systems | For advanced users |
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[Cloud Hypervisor] | Low latency, small memory footprint, small attack surface | Minimal | | excellent | excellent | High performance modern cloud workloads | |
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[Firecracker] | Very slimline | Extremely minimal | Doesn't support all device types | excellent | excellent | Serverless / FaaS | |
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[QEMU] | Lots of features | Lots | | good | good | Good option for most users | | All users |
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For further details, see the [Virtualization in Kata Containers](design/virtualization.md) document and the official documentation for each hypervisor.
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[ACRN]: https://projectacrn.org
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[Cloud Hypervisor]: https://github.com/cloud-hypervisor/cloud-hypervisor
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[Firecracker]: https://github.com/firecracker-microvm/firecracker
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[KVM]: https://en.wikipedia.org/wiki/Kernel-based_Virtual_Machine
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[QEMU]: http://www.qemu-project.org
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@ -19,6 +19,8 @@ For details of the other Kata Containers repositories, see the
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* [Quick start for developers](#quick-start-for-developers)
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* [Architecture overview](#architecture-overview)
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* [Configuration](#configuration)
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* [Hypervisor specific configuration](#hypervisor-specific-configuration)
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* [Stateless systems](#stateless-systems)
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* [Logging](#logging)
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* [Kata OCI](#kata-oci)
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* [Kata containerd shimv2](#kata-containerd-shimv2)
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@ -106,6 +108,15 @@ The file contains comments explaining all options.
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> You may need to modify this file to optimise or tailor your system, or if you have
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> specific requirements.
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### Hypervisor specific configuration
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Kata Containers supports multiple hypervisors so your `configuration.toml`
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configuration file may be a symbolic link to a hypervisor-specific
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configuration file. See
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[the hypervisors document](../../docs/hypervisors.md) for further details.
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### Stateless systems
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Since the runtime supports a
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[stateless system](https://clearlinux.org/about),
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it checks for this configuration file in multiple locations, two of which are
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