[live-migration] adds the paths for enabling save/restore#2709
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Host-side primitives to snapshot in-flight container state on the
source and re-attach to it on the destination, without disturbing
the existing create paths.
- cow: add MigrationState (vsock stdio ports + WaitForProcess call
id) and Process.MigrationState() accessor used by the save path.
Stubbed (zero value) on hcs.Process and jobcontainers.JobProcess.
- gcs:
- Process records the stdio vsock ports allocated by gc.exec and
exposes them via MigrationState; Close tolerates nil io channels
for streams not opened on restore.
- ExitCode tolerates hrNotFound from WaitForProcess (guest may
have reaped the process before the restored host re-subscribes);
Wait now routes through ExitCode.
- Rename CloneContainer -> OpenContainer as the generic "attach to
an already-running container" entry point.
- Add Container.OpenProcessWithIO: restore counterpart of
CreateProcess that re-listens on supplied vsock ports and
re-subscribes to the exit notification.
- Add GuestConnection.NextPort / SetNextPort to snapshot and seed
the IO port allocator floor so restored processes don't collide
with newly-allocated ones.
- cmd: add Attach, the destination counterpart of Command /
CommandContext that binds a Cmd to a caller-resolved process and
wires the IO relays (factored out of Start into startRelay).
- guest/bridge: reset Bridge.protVer to PvInvalid in ListenAndServe
so a fresh NegotiateProtocol after reconnect dispatches to the
PvInvalid handler instead of UnknownMessageHandler.
- vm/guestmanager: add Guest.OpenContainer, NextPort and SetNextPort
wrappers over the underlying GCS connection.
- vm/vmmanager: add UtilityVM.PropertiesV3 and migration.go with the
migration lifecycle wrappers (StartWithMigrationOptions,
Initialize/Start/Transfer/FinalizeLiveMigration,
MigrationNotifications).
- pkg/migration: add parse.go with protobuf -> HCS schema converters
for migration init options (memory transport, throttle params,
compression settings).
- Test and mock updates (cmd, gcs, hcs, jobcontainers, bridge,
controller/process mocks) for the new MigrationState contract,
Attach, and bridge reconnect behavior.
Signed-off-by: Harsh Rawat <harshrawat@microsoft.com>
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Summary
Introduces the host-side primitives needed to snapshot in-flight container state on the source and re-attach to it on the destination, without disturbing the existing create paths.
cow: add MigrationState struct (stdin/stdout/stderr vsock ports + outstanding WaitForProcess bridge call id) and a Process.MigrationState() accessor used by the save path. Stubbed (zero value) on hcs.Process and jobcontainers.JobProcess, since neither uses vsock or a GCS bridge.
internal/gcs:
internal/cmd: add cmd.Attach, the destination-side counterpart of Command/CommandContext that binds a Cmd to a caller-resolved process and wires the IO relays. Relay wiring factored out of Start into startRelay. Tests cover Attach lifetime and IO flow.
internal/guest/bridge: reset Bridge.protVer to PvInvalid at the top of ListenAndServe so a fresh NegotiateProtocol after a reconnect dispatches to the PvInvalid-registered handler instead of falling through to UnknownMessageHandler. Covered by new TestBridge_ListenAndServeResetsProtocolVersion.
internal/vm/guestmanager: add Guest.OpenContainer, NextPort and SetNextPort wrappers over the underlying GCS connection.
internal/vm/vmmanager:
pkg/migration: add parse.go with protobuf -> HCS schema converters for migration initialization options (memory transport, throttle parameters, compression settings).
Test and mock updates across cow, cmd, gcs, hcs, jobcontainers, and bridge packages (including regenerated internal/controller/process/mocks/mock_cow.go) to satisfy the new MigrationState contract and exercise Attach / bridge reconnect behavior.