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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/mem.rs
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@@ -30,11 +30,11 @@ use std::sync::atomic::{AtomicBool, AtomicU64, Ordering};
use std::sync::mpsc;
use std::sync::{Arc, Mutex};
use std::thread;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{
Address, ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemoryAtomic,
GuestMemoryError, GuestMemoryMmap, GuestMemoryRegion, GuestRegionMmap,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const QUEUE_SIZE: u16 = 128;
@@ -955,5 +955,6 @@ impl VirtioDevice for Mem {
}
virtio_pausable!(Mem);
impl Snapshotable for Mem {}
impl Snapshottable for Mem {}
impl Transportable for Mem {}
impl Migratable for Mem {}