openapi: 3.0.1
info:
  title: Cloud Hypervisor API
  description: Local HTTP based API for managing and inspecting a cloud-hypervisor virtual machine.
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html
  version: 0.3.0

servers:
- url: http://localhost/api/v1

paths:

  /vmm.ping:
    get:
      summary: Ping the VMM to check for API server availability
      responses:
        200:
          description: The VMM information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VmmPingResponse'

  /vmm.shutdown:
    put:
      summary: Shuts the cloud-hypervisor VMM.
      operationId: shutdownVMM
      responses:
        204:
          description: The VMM successfully shutdown.

  /vm.info:
    get:
      summary: Returns general information about the cloud-hypervisor Virtual Machine (VM) instance.
      responses:
        200:
          description: The VM information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VmInfo'

  /vm.counters:
    get:
      summary: Get counters from the VM
      responses:
        200:
          description: The VM counters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/VmCounters'

  /vm.create:
    put:
      summary: Create the cloud-hypervisor Virtual Machine (VM) instance. The instance is not booted, only created.
      operationId: createVM
      requestBody:
        description: The VM configuration
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmConfig'
        required: true
      responses:
        204:
          description: The VM instance was successfully created.

  /vm.delete:
    put:
      summary: Delete the cloud-hypervisor Virtual Machine (VM) instance.
      operationId: deleteVM
      responses:
        204:
          description: The VM instance was successfully deleted.

  /vm.boot:
    put:
      summary: Boot the previously created VM instance.
      operationId: bootVM
      responses:
        204:
          description: The VM instance successfully booted.
        404:
          description: The VM instance could not boot because it is not created yet

  /vm.pause:
    put:
      summary: Pause a previously booted VM instance.
      operationId: pauseVM
      responses:
        204:
          description: The VM instance successfully paused.
        404:
          description: The VM instance could not pause because it is not created yet
        405:
          description: The VM instance could not pause because it is not booted.

  /vm.resume:
    put:
      summary: Resume a previously paused VM instance.
      operationId: resumeVM
      responses:
        204:
          description: The VM instance successfully paused.
        404:
          description: The VM instance could not resume because it is not booted yet
        405:
          description: The VM instance could not resume because it is not paused.

  /vm.shutdown:
    put:
      summary: Shut the VM instance down.
      operationId: shutdownVM
      responses:
        204:
          description: The VM instance successfully shut down.
        404:
          description: The VM instance could not shut down because is not created.
        405:
          description: The VM instance could not shut down because it is not started.

  /vm.reboot:
    put:
      summary: Reboot the VM instance.
      operationId: rebootVM
      responses:
        204:
          description: The VM instance successfully rebooted.
        404:
          description: The VM instance could not reboot because it is not created.
        405:
          description: The VM instance could not reboot because it is not booted.

  /vm.power-button:
    put:
      summary: Trigger a power button in the VM
      operationId: power-buttonVM
      responses:
        204:
          description: Power button successfully triggered in the VM
        404:
          description: The button could not be triggered because it is not created yet
        405:
          description: The button could not be triggered because it is not booted.

  /vm.resize:
    put:
      summary: Resize the VM
      requestBody:
        description: The target size for the VM
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmResize'
        required: true
      responses:
        204:
          description: The VM instance was successfully resized.
        404:
          description: The VM instance could not be resized because it is not created.

  /vm.resize-zone:
    put:
      summary: Resize a memory zone
      requestBody:
        description: The target size for the memory zone
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmResizeZone'
        required: true
      responses:
        204:
          description: The memory zone was successfully resized.
        500:
          description: The memory zone could not be resized.

  /vm.add-device:
    put:
      summary: Add a new device to the VM
      requestBody:
        description: The path of the new device
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmAddDevice'
        required: true
      responses:
        200:
          description: The new device was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new device was successfully (cold) added to the VM instance.
        404:
          description: The new device could not be added to the VM instance.

  /vm.remove-device:
    put:
      summary: Remove a device from the VM
      requestBody:
        description: The identifier of the device
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmRemoveDevice'
        required: true
      responses:
        204:
          description: The device was successfully removed from the VM instance.
        404:
          description: The device could not be removed from the VM instance.

  /vm.add-disk:
    put:
      summary: Add a new disk to the VM
      requestBody:
        description: The details of the new disk
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DiskConfig'
        required: true
      responses:
        200:
          description: The new disk was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new disk was successfully (cold) added to the VM instance.
        500:
          description: The new disk could not be added to the VM instance.

  /vm.add-fs:
    put:
      summary: Add a new virtio-fs device to the VM
      requestBody:
        description: The details of the new virtio-fs
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/FsConfig'
        required: true
      responses:
        200:
          description: The new device was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new device was successfully (cold) added to the VM instance.
        500:
          description: The new device could not be added to the VM instance.

  /vm.add-pmem:
    put:
      summary: Add a new pmem device to the VM
      requestBody:
        description: The details of the new pmem device
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PmemConfig'
        required: true
      responses:
        200:
          description: The new device was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new device was successfully (cold) added to the VM instance.
        500:
          description: The new device could not be added to the VM instance.

  /vm.add-net:
    put:
      summary: Add a new network device to the VM
      requestBody:
        description: The details of the new network device
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/NetConfig'
        required: true
      responses:
        200:
          description: The new device was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new device was successfully (cold) added to the VM instance.
        500:
          description: The new device could not be added to the VM instance.

  /vm.add-vsock:
    put:
      summary: Add a new vsock device to the VM
      requestBody:
        description: The details of the new vsock device
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VsockConfig'
        required: true
      responses:
        200:
          description: The new device was successfully added to the VM instance.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PciDeviceInfo'
        204:
          description: The new device was successfully (cold) added to the VM instance.
        500:
          description: The new device could not be added to the VM instance.


  /vm.snapshot:
    put:
      summary: Returns a VM snapshot.
      requestBody:
        description: The snapshot configuration
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/VmSnapshotConfig'
        required: true
      responses:
        204:
          description: The VM instance was successfully snapshotted.
        404:
          description: The VM instance could not be snapshotted because it is not created.
        405:
          description: The VM instance could not be snapshotted because it is not booted.

  /vm.restore:
    put:
      summary: Restore a VM from a snapshot.
      requestBody:
        description: The restore configuration
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/RestoreConfig'
        required: true
      responses:
        204:
          description: The VM instance was successfully restored.
        404:
          description: The VM instance could not be restored because it is already created.

  /vm.receive-migration:
    put:
      summary: Receive a VM migration from URL
      requestBody:
        description: The URL for the reception of migration state
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ReceiveMigrationData'
        required: true
      responses:
        204:
          description: The VM migration was successfully received.
        500:
          description: The VM migration could not be received.

  /vm.send-migration:
    put:
      summary: Send a VM migration to URL
      requestBody:
        description: The URL for sending the migration state
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SendMigrationData'
        required: true
      responses:
        204:
          description: The VM migration was successfully sent.
        500:
          description: The VM migration could not be sent.

components:
  schemas:

    VmmPingResponse:
      required:
      - version
      type: object
      properties:
        version:
          type: string
      description: Virtual Machine Monitor information

    VmInfo:
      required:
      - config
      - state
      type: object
      properties:
        config:
          $ref: '#/components/schemas/VmConfig'
        state:
          type: string
          enum: [Created, Running, Shutdown, Paused]
        memory_actual_size:
          type: integer
          format: int64
        device_tree:
          type: object
          additionalProperties:
            $ref: '#/components/schemas/DeviceNode'
      description: Virtual Machine information

    DeviceNode:
      type: object
      properties:
        id:
          type: string
        resources:
          type: array
          items:
            # Rust enum type (with data) which can't be better represented here
            type: object
        children:
          type: array
          items:
            type: string
        pci_bdf:
          type: string

    VmCounters:
      type: object
      additionalProperties:
        type: object
        additionalProperties:
          type: integer
          format: int64

    PciDeviceInfo:
      required:
      - id
      - bdf
      type: object
      properties:
        id:
          type: string
        bdf:
          type: string
      description: Information about a PCI device

    VmConfig:
      required:
      - kernel
      type: object
      properties:
        cpus:
          $ref: '#/components/schemas/CpusConfig'
        memory:
          $ref: '#/components/schemas/MemoryConfig'
        kernel:
          $ref: '#/components/schemas/KernelConfig'
        initramfs:
          $ref: '#/components/schemas/InitramfsConfig'
        cmdline:
          $ref: '#/components/schemas/CmdLineConfig'
        disks:
          type: array
          items:
            $ref: '#/components/schemas/DiskConfig'
        net:
          type: array
          items:
            $ref: '#/components/schemas/NetConfig'
        rng:
          $ref: '#/components/schemas/RngConfig'
        balloon:
          $ref: '#/components/schemas/BalloonConfig'
        fs:
          type: array
          items:
            $ref: '#/components/schemas/FsConfig'
        pmem:
          type: array
          items:
            $ref: '#/components/schemas/PmemConfig'
        serial:
          $ref: '#/components/schemas/ConsoleConfig'
        console:
          $ref: '#/components/schemas/ConsoleConfig'
        devices:
          type: array
          items:
            $ref: '#/components/schemas/DeviceConfig'
        vsock:
            $ref: '#/components/schemas/VsockConfig'
        sgx_epc:
          type: array
          items:
            $ref: '#/components/schemas/SgxEpcConfig'
        tdx:
          $ref: '#/components/schemas/TdxConfig'
        numa:
          type: array
          items:
            $ref: '#/components/schemas/NumaConfig'
        iommu:
          type: boolean
          default: false
        watchdog:
          type: boolean
          default: false
        platform:
          $ref: '#/components/schemas/PlatformConfig'
      description: Virtual machine configuration

    CpuAffinity:
      type: object
      properties:
        vcpu:
          type: integer
        host_cpus:
          type: array
          items:
            type: integer

    CpuTopology:
      type: object
      properties:
        threads_per_core:
          type: integer
        cores_per_die:
          type: integer
        dies_per_package:
          type: integer
        packages:
          type: integer

    CpusConfig:
      required:
      - boot_vcpus
      - max_vcpus
      type: object
      properties:
        boot_vcpus:
          minimum: 1
          default: 1
          type: integer
        max_vcpus:
          minimum: 1
          default: 1
          type: integer
        topology:
          $ref: '#/components/schemas/CpuTopology'
        max_phys_bits:
          type: integer
        affinity:
          type: array
          items:
            $ref: '#/components/schemas/CpuAffinity'

    PlatformConfig:
      type: object
      properties:
        num_pci_segments:
          type: integer
          format: int16
        iommu_segments:
          type: array
          items:
            type: integer
            format: int16

    MemoryZoneConfig:
      required:
      - id
      - size
      type: object
      properties:
        id:
          type: string
        size:
          type: integer
          format: int64
          default: 512 MB
        file:
          type: string
        mergeable:
          type: boolean
          default: false
        shared:
          type: boolean
          default: false
        hugepages:
          type: boolean
          default: false
        hugepage_size:
          type: integer
          format: int64
        host_numa_node:
          type: integer
          format: int32
        hotplug_size:
          type: integer
          format: int64
        hotplugged_size:
          type: integer
          format: int64
        prefault:
          type: boolean
          default: false

    MemoryConfig:
      required:
      - size
      type: object
      properties:
        size:
          type: integer
          format: int64
          default: 512 MB
        hotplug_size:
          type: integer
          format: int64
        hotplugged_size:
          type: integer
          format: int64
        mergeable:
          type: boolean
          default: false
        hotplug_method:
          type: string
          default: "Acpi"
        shared:
          type: boolean
          default: false
        hugepages:
          type: boolean
          default: false
        hugepage_size:
          type: integer
          format: int64
        prefault:
          type: boolean
          default: false
        zones:
          type: array
          items:
            $ref: '#/components/schemas/MemoryZoneConfig'

    KernelConfig:
      required:
      - path
      type: object
      properties:
        path:
          type: string

    InitramfsConfig:
      nullable: true
      required:
      - path
      type: object
      properties:
        path:
          type: string

    CmdLineConfig:
      required:
      - args
      type: object
      properties:
        args:
          type: string

    TokenBucket:
      required:
      - size
      - refill_time
      type: object
      properties:
        size:
          type: integer
          format: int64
          minimum: 0
          description: The total number of tokens this bucket can hold.
        one_time_burst:
          type: integer
          format: int64
          minimum: 0
          description: The initial size of a token bucket.
        refill_time:
          type: integer
          format: int64
          minimum: 0
          description: The amount of milliseconds it takes for the bucket to refill.
      description:
        Defines a token bucket with a maximum capacity (_size_), an initial burst size
        (_one_time_burst_) and an interval for refilling purposes (_refill_time_).
        The refill-rate is derived from _size_ and _refill_time_, and it is the constant
        rate at which the tokens replenish. The refill process only starts happening after
        the initial burst budget is consumed.
        Consumption from the token bucket is unbounded in speed which allows for bursts
        bound in size by the amount of tokens available.
        Once the token bucket is empty, consumption speed is bound by the refill-rate.

    RateLimiterConfig:
      type: object
      properties:
        bandwidth:
          $ref: '#/components/schemas/TokenBucket'
        ops:
          $ref: '#/components/schemas/TokenBucket'
      description:
        Defines an IO rate limiter with independent bytes/s and ops/s limits.
        Limits are defined by configuring each of the _bandwidth_ and _ops_ token buckets.

    DiskConfig:
      required:
      - path
      type: object
      properties:
        path:
          type: string
        readonly:
          type: boolean
          default: false
        direct:
          type: boolean
          default: false
        iommu:
          type: boolean
          default: false
        num_queues:
          type: integer
          default: 1
        queue_size:
          type: integer
          default: 128
        vhost_user:
          type: boolean
          default: false
        vhost_socket:
          type: string
        poll_queue:
          type: boolean
          default: true
        rate_limiter_config:
            $ref: '#/components/schemas/RateLimiterConfig'
        pci_segment:
          type: integer
          format: int16
        id:
          type: string

    NetConfig:
      type: object
      properties:
        tap:
          type: string
        ip:
          type: string
          default: "192.168.249.1"
        mask:
          type: string
          default: "255.255.255.0"
        mac:
          type: string
        iommu:
          type: boolean
          default: false
        num_queues:
          type: integer
          default: 2
        queue_size:
          type: integer
          default: 256
        vhost_user:
          type: boolean
          default: false
        vhost_socket:
          type: string
        vhost_mode:
          type: string
          default: "Client"
        id:
          type: string
        pci_segment:
          type: integer
          format: int16
        rate_limiter_config:
            $ref: '#/components/schemas/RateLimiterConfig'

    RngConfig:
      required:
      - src
      type: object
      properties:
        src:
          type: string
          default: "/dev/urandom"
        iommu:
          type: boolean
          default: false

    BalloonConfig:
      required:
      - size
      type: object
      properties:
        size:
          type: integer
          format: int64
        deflate_on_oom:
          type: boolean
          default: false
          description: Deflate balloon when the guest is under memory pressure.
        free_page_reporting:
          type: boolean
          default: false
          description: Enable guest to report free pages.

    FsConfig:
      required:
      - cache_size
      - dax
      - num_queues
      - queue_size
      - socket
      - tag
      type: object
      properties:
        tag:
          type: string
        socket:
          type: string
        num_queues:
          type: integer
          default: 1
        queue_size:
          type: integer
          default: 1024
        dax:
          type: boolean
          default: true
        cache_size:
          type: integer
          format: int64
          default: 8589934592
        pci_segment:
          type: integer
          format: int16
        id:
          type: string

    PmemConfig:
      required:
      - file
      type: object
      properties:
        file:
          type: string
        size:
          type: integer
          format: int64
        iommu:
          type: boolean
          default: false
        mergeable:
          type: boolean
          default: false
        discard_writes:
          type: boolean
          default: false
        pci_segment:
          type: integer
          format: int16
        id:
          type: string

    ConsoleConfig:
      required:
      - mode
      type: object
      properties:
        file:
          type: string
        mode:
          type: string
          enum: [Off, Pty, Tty, File, Null]
        iommu:
          type: boolean
          default: false

    DeviceConfig:
      required:
      - path
      type: object
      properties:
        path:
          type: string
        iommu:
          type: boolean
          default: false
        pci_segment:
          type: integer
          format: int16
        id:
          type: string

    VsockConfig:
      required:
      - cid
      - socket
      type: object
      properties:
        cid:
          type: integer
          format: int64
          minimum: 3
          description: Guest Vsock CID
        socket:
          type: string
          description: Path to UNIX domain socket, used to proxy vsock connections.
        iommu:
          type: boolean
          default: false
        pci_segment:
          type: integer
          format: int16
        id:
          type: string

    SgxEpcConfig:
      required:
      - id
      - size
      type: object
      properties:
        id:
          type: string
        size:
          type: integer
          format: int64
        prefault:
          type: boolean
          default: false

    TdxConfig:
      required:
      - firmware
      type: object
      properties:
        firmware:
          type: string
          description: Path to the firmware that will be used to boot the TDx guest up.

    NumaDistance:
      required:
      - destination
      - distance
      type: object
      properties:
        destination:
          type: integer
          format: int32
        distance:
          type: integer
          format: int32

    NumaConfig:
      required:
      - guest_numa_id
      type: object
      properties:
        guest_numa_id:
          type: integer
          format: int32
        cpus:
          type: array
          items:
            type: integer
            format: int32
        distances:
          type: array
          items:
            $ref: '#/components/schemas/NumaDistance'
        memory_zones:
          type: array
          items:
            type: string
        sgx_epc_sections:
          type: array
          items:
            type: string

    VmResize:
      type: object
      properties:
        desired_vcpus:
          minimum: 1
          type: integer
        desired_ram:
          description: desired memory ram in bytes
          type: integer
          format: int64
        desired_balloon:
          description: desired balloon size in bytes
          type: integer
          format: int64

    VmResizeZone:
      type: object
      properties:
        id:
          type: string
        desired_ram:
          description: desired memory zone size in bytes
          type: integer
          format: int64

    VmAddDevice:
      type: object
      properties:
        path:
          type: string
        iommu:
          type: boolean
          default: false
        id:
          type: string

    VmRemoveDevice:
      type: object
      properties:
        id:
          type: string

    VmSnapshotConfig:
      type: object
      properties:
        destination_url:
          type: string

    RestoreConfig:
      required:
      - source_url
      type: object
      properties:
        source_url:
          type: string
        prefault:
          type: boolean

    ReceiveMigrationData:
      required:
      - receiver_url
      type: object
      properties:
        receiver_url:
          type: string

    SendMigrationData:
      required:
      - destination_url
      type: object
      properties:
        destination_url:
          type: string
        local:
          type: boolean