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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/vhost_user/blk.rs
View File

@@ -26,8 +26,8 @@ use vhost_rs::vhost_user::{Master, VhostUserMaster, VhostUserMasterReqHandler};
use vhost_rs::VhostBackend;
use virtio_bindings::bindings::virtio_blk::*;
use virtio_bindings::bindings::virtio_ring::VIRTIO_RING_F_EVENT_IDX;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{ByteValued, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
struct SlaveReqHandler {}
@@ -328,5 +328,6 @@ impl VirtioDevice for Blk {
}
virtio_pausable!(Blk);
impl Snapshotable for Blk {}
impl Snapshottable for Blk {}
impl Transportable for Blk {}
impl Migratable for Blk {}

5
vm-virtio/src/vhost_user/fs.rs
View File

@@ -26,10 +26,10 @@ use vhost_rs::vhost_user::{
HandlerResult, Master, MasterReqHandler, VhostUserMaster, VhostUserMasterReqHandler,
};
use vhost_rs::VhostBackend;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{
Address, ByteValued, GuestAddress, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap,
};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const NUM_QUEUE_OFFSET: usize = 1;
@@ -555,5 +555,6 @@ impl VirtioDevice for Fs {
}
virtio_pausable!(Fs);
impl Snapshotable for Fs {}
impl Snapshottable for Fs {}
impl Transportable for Fs {}
impl Migratable for Fs {}

5
vm-virtio/src/vhost_user/net.rs
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@@ -27,8 +27,8 @@ use vhost_rs::vhost_user::{Master, VhostUserMaster, VhostUserMasterReqHandler};
use vhost_rs::VhostBackend;
use virtio_bindings::bindings::virtio_net;
use virtio_bindings::bindings::virtio_ring;
use vm_device::{Migratable, MigratableError, Pausable, Snapshotable};
use vm_memory::{ByteValued, GuestAddressSpace, GuestMemoryAtomic, GuestMemoryMmap};
use vm_migration::{Migratable, MigratableError, Pausable, Snapshottable, Transportable};
use vmm_sys_util::eventfd::EventFd;
const DEFAULT_QUEUE_NUMBER: usize = 2;
@@ -365,5 +365,6 @@ impl VirtioDevice for Net {
}
virtio_ctrl_q_pausable!(Net);
impl Snapshotable for Net {}
impl Snapshottable for Net {}
impl Transportable for Net {}
impl Migratable for Net {}