VmGenId

vmm::devices::acpi::vmgenid

Struct VmGenId 

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pub struct VmGenId {
    pub gen_id: u128,
    pub interrupt_evt: EventFdTrigger,
    pub guest_address: GuestAddress,
    pub gsi: u32,
}
Expand description

Virtual Machine Generation ID device

VMGenID is an emulated device which exposes to the guest a 128-bit cryptographically random integer value which will be different every time the virtual machine executes from a different configuration file. In Firecracker terms this translates to a different value every time a new microVM is created, either from scratch or restored from a snapshot.

The device specification can be found here: https://go.microsoft.com/fwlink/?LinkId=260709

Fields§

§gen_id: u128

Current generation ID of guest VM

§interrupt_evt: EventFdTrigger

Interrupt line for notifying the device about generation ID changes

§guest_address: GuestAddress

Guest physical address where VMGenID data lives.

§gsi: u32

GSI number for the device

Implementations§

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impl VmGenId

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pub fn from_parts(guest_address: GuestAddress, gsi: u32) -> Self

Create a new Vm Generation Id device using an address in the guest for writing the generation ID and a GSI for sending device notifications.

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pub fn new(resource_allocator: &mut ResourceAllocator) -> Self

Create a new VMGenID device

Allocate memory and a GSI for sending notifications and build the device

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pub fn notify_guest(&mut self) -> Result<(), Error>

Send an ACPI notification to guest device.

This will only have effect if we have updated the generation ID in guest memory, i.e. when re-creating the device after snapshot resumption.

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pub fn activate(&self, mem: &GuestMemoryMmap) -> Result<(), GuestMemoryError>

Attach the VmGenId device

Trait Implementations§

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impl Aml for VmGenId

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fn append_aml_bytes(&self, v: &mut Vec<u8>) -> Result<(), AmlError>

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fn to_aml_bytes(&self) -> Result<Vec<u8>, AmlError>

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impl Debug for VmGenId

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'a> Persist<'a> for VmGenId

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type State = VMGenIDState

The type of the object representing the state of the component.
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type ConstructorArgs = ()

The type of the object holding the constructor arguments.
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type Error = Infallible

The type of the error that can occur while constructing the object.
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fn save(&self) -> Self::State

Returns the current state of the component.
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fn restore( _: Self::ConstructorArgs, state: &Self::State, ) -> Result<Self, Self::Error>

Constructs a component from a specified state.

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