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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
vmm/src/device_manager.rs
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@@ -51,11 +51,11 @@ use vm_allocator::SystemAllocator;
use vm_device::interrupt::{
InterruptIndex, InterruptManager, LegacyIrqGroupConfig, MsiIrqGroupConfig,
};
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::guest_memory::FileOffset;
use vm_memory::{
Address, GuestAddress, GuestAddressSpace, GuestRegionMmap, GuestUsize, MmapRegion,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
#[cfg(feature = "pci_support")]
use vm_virtio::transport::VirtioPciDevice;
use vm_virtio::transport::VirtioTransport;
@@ -2373,7 +2373,8 @@ impl Pausable for DeviceManager {
}
}
impl Snapshotable for DeviceManager {}
impl Snapshottable for DeviceManager {}
impl Transportable for DeviceManager {}
impl Migratable for DeviceManager {}
#[cfg(feature = "pci_support")]