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README.md: Update documentation

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Update supported OS & hypervisor details along with details of the new
stability guarantees.

Signed-off-by: Rob Bradford <robert.bradford@intel.com>
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Rob Bradford 2021-04-29 10:15:12 +01:00
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@ -26,7 +26,8 @@
# 1. What is Cloud Hypervisor?
Cloud Hypervisor is an open source Virtual Machine Monitor (VMM) that runs on top of [KVM](https://www.kernel.org/doc/Documentation/virtual/kvm/api.txt).
Cloud Hypervisor is an open source Virtual Machine Monitor (VMM) that runs on top of [KVM](https://www.kernel.org/doc/Documentation/virtual/kvm/api.txt) and the MSHV hypervisors .
The project focuses on exclusively running modern, cloud workloads, on top of a limited set of hardware architectures and platforms.
Cloud workloads refers to those that are usually run by customers inside a cloud provider. For our purposes this means modern operating systems with most I/O handled by paravirtualised devices (i.e. virtio), no requirement for legacy devices, and 64-bit CPUs.
@ -36,7 +37,7 @@ Cloud Hypervisor is implemented in [Rust](https://www.rust-lang.org/) and is bas
### High Level
- KVM based
- Runs on KVM or MSHV
- Minimal emulation
- Low latency
- Low memory footprint
@ -53,7 +54,7 @@ Cloud Hypervisor supports the `x86-64` and `AArch64` architectures. There are so
### Guest OS
Cloud Hypervisor supports `64-bit Linux` with support for _modern_ 64-bit Windows guests currently under development.
Cloud Hypervisor supports `64-bit Linux` and Windows 10/Windows Server 2019.
# 2. Getting Started
@ -241,12 +242,29 @@ $ ./cloud-hypervisor/target/release/cloud-hypervisor \
# 3. Status
Cloud Hypervisor is under active development. No API or feature stability is guaranteed.
Cloud Hypervisor is under active development. The following stability guarantees are currently made:
As of 2020-07-02, the following cloud images are supported:
* The API (including command line options) will not be removed or changed in a
breaking way without a minimum of 2 releases notice. Where possible warnings
will be given about the use of deprecated functionality and the deprecations
will be documented in the release notes.
* Point releases will be made between individual releases where there are
substantial bug fixes or security issues that need to be fixed.
Currently the following items are **not** guaranteed across updates:
* Snapshot/restore is not supported across different versions
* Live migration is not supported across different versions
* The following features are considered experimental and may change
substantially between releases: TDX, SGX.
As of 2021-04-29, the following cloud images are supported:
- [Ubuntu Bionic](https://cloud-images.ubuntu.com/bionic/current/) (cloudimg)
- [Ubuntu Focal](https://cloud-images.ubuntu.com/focal/current/) (cloudimg)
- [Ubuntu Groovy](https://cloud-images.ubuntu.com/groovy/current/) (cloudimg)
- [Ubuntu Hirsute](https://cloud-images.ubuntu.com/hirsute/current/) (cloudimg)
Direct kernel boot to userspace should work with a rootfs from most distributions.