Firecracker v0.23.3

Fixed

• Fixed the SIGPIPE signal handler so Firecracker no longer exits. The signal
  is still recorded in metrics and logs.

Firecracker v0.22.4

Fixed

• Fixed the reported used bytes for any virtio-block request.
• Fixed all virtio-block read/write operations to valid guest addresses
  with buffer length of 0 to result in no-op.

Firecracker v0.23.2

Fixed

• Fixed off-by-one error in virtio-block descriptor address validation.

Firecracker v0.24.1

Fixed

• Fixed off-by-one error in virtio-block descriptor address validation.

Firecracker v0.22.3

Fixed

• Fixed off-by-one error in virtio-block descriptor address validation.

Firecracker v0.24.0

Added

• Added optional resume_vm field to /snapshot/load API call.
• Added support for block rate limiter PATCH.
• Added devtool test -c|--cpuset-cpus flag for cpus confinement when tests
  run.
• Added devtool test -m|--cpuset-mems flag for memory confinement when tests
  run.
• Added the virtio traditional memory ballooning device.
• Added a mechanism to handle vCPU/VMM errors that result in process termination.
• Added incremental guest memory snapshot support.
• Added aarch64 snapshot support.

Changed

• Change the information provided in DescribeInstance command to provide microVM
  state information (Not started/Running/Paused) instead of whether it's started or not.
• Removed the jailer --extra-args parameter. It was a noop, having been
  replaced by the -- separator for extra arguments.
• Changed the output of the --version command line parameter to include a list
  of supported snapshot data format versions for the firecracker binary.
• Increased the maximum number of virtio devices from 11 to 19.
• Added a new check that prevents creating v0.23 snapshots when more than 11
  devices are attached.
• If the stdout buffer is full and non-blocking, the serial writes no longer block.
  Any new bytes will be lost, until the buffer is freed. The device also logs these
  errors and increments the uart.error_count metric for each lost byte.

Fixed

• Fixed inconsistency in YAML file InstanceInfo definition

Firecracker v0.23.1

Fixed

Fixed inconsistency in YAML file InstanceInfo definition

Firecracker v0.22.2

Fixed

Fixed inconsistency in YAML file InstanceInfo definition

Firecracker v0.23.0

Added

• Added full support for AMD CPUs (General Availability). More details here.
• Added snapshot-restore functionality (Developer preview). More details here.
• Added metric for throttled block device events.
• Added metrics for counting rate limiter throttling events.
• Added metric for counting MAC address updates.
• Added metrics for counting TAP read and write errors.
• Added metrics for counting RX and TX partial writes.
• Added metrics that measure the duration of pausing and resuming the microVM,
  from the VMM perspective.
• Added metric for measuring the duration of the last full snapshot created,
  from the VMM perspective.
• Added metric for measuring the duration of loading a snapshot, from the VMM
  perspective.
• Added metrics that measure the duration of pausing and resuming the microVM,
  from the API (user) perspective.
• Added metric for measuring the duration of the last full snapshot created,
  from the API (user) perspective.
• Added metric for measuring the duration of loading a snapshot, from the API
  (user) perspective.
• Added track_dirty_pages field to machine-config. If enabled, Firecracker
  can create incremental guest memory snapshots by saving the dirty guest pages
  in a sparse file.
• Added a new API call, PATCH /vm, for changing the microVM state (to
  Paused or Resumed).
• Added a new API call, PUT /snapshot/create, for creating a full snapshot.
• Added a new API call, PUT /snapshot/load, for loading a snapshot.
• Added new jailer command line argument --cgroup which allow the user to
  specify the cgroups that are going to be set by the Jailer.

Fixed

• Boot time on AMD achieves the desired performance (i.e under 150ms).

Changed

• The logger level field is now case-insensitive.
• Disabled boot timer device after restoring a snapshot.
• Enabled boot timer device only when specifically requested, by using the
  --boot-timer dedicated cmdline parameter.
• firecracker and jailer --version now gets updated on each devtool
  build to the output of git describe --dirty, if the git repo is available.
• MicroVM process is only attached to the cgroups defined by using --cgroups
  or the ones defined indirectly by using --node.

Firecracker v0.22.1

Fixed

• Limited serial device buffer size to maximum 64 bytes.