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vm-migration: Define the Snapshottable and Transportable traits

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A Snapshottable component can snapshot itself and
provide a MigrationSnapshot payload as a result.

A MigrationSnapshot payload is a map of component IDs to a list of
migration sections (MigrationSection). As component can be made of
several Migratable sub-components (e.g. the DeviceManager and its
device objects), a migration snapshot can be made of multiple snapshot
itself.
A snapshot is a list of migration sections, each section being a
component state snapshot. Having multiple sections allows for easier and
backward compatible migration payload extensions.

Once created, a migratable component snapshot may be transported and this
is what the Transportable trait defines, through 2 methods: send and recv.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
This commit is contained in:
Samuel Ortiz
2019-05-02 00:59:51 +08:00
committed by Rob Bradford
parent 2d17f4384a
commit 1b1a2175ca
25 changed files with 788 additions and 615 deletions
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5
vm-virtio/src/vsock/device.rs
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@@ -44,8 +44,8 @@ use std::result;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, RwLock};
use std::thread;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const QUEUE_SIZE: u16 = 256;
@@ -574,7 +574,8 @@ where
virtio_pausable!(Vsock, T: 'static + VsockBackend + Sync);
impl<B> Snapshotable for Vsock<B> where B: VsockBackend + Sync + 'static {}
impl<B> Snapshottable for Vsock<B> where B: VsockBackend + Sync + 'static {}
impl<B> Transportable for Vsock<B> where B: VsockBackend + Sync + 'static {}
impl<B> Migratable for Vsock<B> where B: VsockBackend + Sync + 'static {}
#[cfg(test)]