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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/block.rs
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@@ -31,11 +31,11 @@ use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Arc, Mutex};
use std::thread;
use virtio_bindings::bindings::virtio_blk::*;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{
ByteValued, Bytes, GuestAddress, GuestAddressSpace, GuestMemory, GuestMemoryAtomic,
GuestMemoryError, GuestMemoryMmap,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::{eventfd::EventFd, seek_hole::SeekHole, write_zeroes::PunchHole};
const SECTOR_SHIFT: u8 = 9;
@@ -1051,5 +1051,6 @@ impl<T: 'static + DiskFile + Send> VirtioDevice for Block<T> {
}
virtio_pausable!(Block, T: 'static + DiskFile + Send);
impl<T: 'static + DiskFile + Send> Snapshotable for Block<T> {}
impl<T: 'static + DiskFile + Send> Snapshottable for Block<T> {}
impl<T: 'static + DiskFile + Send> Transportable for Block<T> {}
impl<T: 'static + DiskFile + Send> Migratable for Block<T> {}