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docs: Update the Cloud Hypervisor description in virtualization.md

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The current description on the Cloud Hypervisor support in Kata
containers were introduced back to kata 1.10 and are out-dated.

Depends-on: github.com/kata-containers/tests#3106

Fixes: #1167

Signed-off-by: Bo Chen <chen.bo@intel.com>
This commit is contained in:
Bo Chen 2020-12-03 17:18:59 -08:00
parent f7383ef835
commit d47122e959
1 changed files with 20 additions and 9 deletions
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docs/design/virtualization.md
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@ -100,23 +100,34 @@ Devices used:
### Cloud Hypervisor/KVM
Cloud Hypervisor, based on [rust-VMM](https://github.com/rust-vmm), is designed to have a lighter footprint and attack surface. For Kata Containers,
relative to Firecracker, the Cloud Hypervisor configuration provides better compatibility at the expense of exposing additional devices: file system
sharing and direct device assignment. As of the 1.10 release of Kata Containers, Cloud Hypervisor does not support device hotplug, and as a result
does not support updating container resources after boot, or utilizing block based volumes. While Cloud Hypervisor does support VFIO, Kata is still adding
this support. As of 1.10, Kata does not support block based volumes or direct device assignment. See [Cloud Hypervisor device support documentation](https://github.com/cloud-hypervisor/cloud-hypervisor/blob/master/docs/device_model.md)
for more details on Cloud Hypervisor.
[Cloud Hypervisor](https://github.com/cloud-hypervisor/cloud-hypervisor), based
on [rust-vmm](https://github.com/rust-vmm), is designed to have a
lighter footprint and smaller attack surface for running modern cloud
workloads. Kata Containers with Cloud
Hypervisor provides mostly complete compatibility with Kubernetes
comparable to the QEMU configuration. As of the 1.12 and 2.0.0 release
of Kata Containers, the Cloud Hypervisor configuration supports both CPU
and memory resize, device hotplug (disk and VFIO), file-system sharing through virtio-fs,
block-based volumes, booting from VM images backed by pmem device, and
fine-grained seccomp filters for each VMM threads (e.g. all virtio
device worker threads). Please check [this GitHub Project](https://github.com/orgs/kata-containers/projects/21)
for details of ongoing integration efforts.
Devices used:
- virtio VSOCK
Devices and features used:
- virtio VSOCK or virtio serial
- virtio block
- virtio net
- virtio fs
- virtio pmem
- VFIO
- hotplug
- seccomp filters
- [HTTP OpenAPI](https://github.com/cloud-hypervisor/cloud-hypervisor/blob/master/vmm/src/api/openapi/cloud-hypervisor.yaml)
### Summary
| Solution | release introduced | brief summary |
|-|-|-|
| Cloud Hypervisor | 1.10 | rust-VMM based, includes VFIO and FS sharing through virtio-fs, no hotplug |
| Cloud Hypervisor | 1.10 | upstream Cloud Hypervisor with rich feature support, e.g. hotplug, VFIO and FS sharing|
| Firecracker | 1.5 | upstream Firecracker, rust-VMM based, no VFIO, no FS sharing, no memory/CPU hotplug |
| QEMU | 1.0 | upstream QEMU, with support for hotplug and filesystem sharing |