This series adds high-level wrappers to handle migration state; they consist
of a Migratable<> type that implements the snapshotting technique mentioned
in Zhao and my KVM Forum presentation.
The wrappers (should) make it possible to easily implement migration of
thread-safe devices. I say "should" because, even though there are tests
included in the series, they are anything but "battle tested"; for this
reason they are marked as "proof of concept" in docs/devel/rust.rst.
The first device to use this will be HPET.
This is an interesting step in enabling usage of Rust in QEMU; instead of
just wrapping existing C APIs, it provides a new interface that deals
better with unique features of the Rust language. In other words,
something like Migratable<> and ToMigrationState might hypothetically
exist even if QEMU was written in Rust from scratch.
Paolo
RFC->v1:
new patches
- rust: migration: do not pass raw pointer to VMStateDescription::fields
- rust: migration: do not store raw pointers into VMStateSubsectionsWrapper
- rust: migration: validate termination of subsection arrays
- timer: constify some functions
changes
- use UnsafeCell::get_mut()
- add and use Timer::expire_time_ns()
- small reordering of the implementations of
ToMigrationState/ToMigrationStateShared
- list migration::migratable in docs/devel/rust.rst
Paolo Bonzini (11):
rust: bql: add BqlRefCell::get_mut()
rust: migration: do not pass raw pointer to VMStateDescription::fields
rust: migration: do not store raw pointers into
VMStateSubsectionsWrapper
rust: migration: validate termination of subsection arrays
rust: migration: extract vmstate_fields_ref
rust: move VMState from bql to migration
rust: migration: add high-level migration wrappers
rust: qemu-macros: add ToMigrationState derive macro
timer: constify some functions
rust: migration: implement ToMigrationState for Timer
rust: migration: implement ToMigrationState as part of
impl_vmstate_bitsized
docs/devel/rust.rst | 1 +
include/qemu/timer.h | 6 +-
util/qemu-timer.c | 8 +-
rust/Cargo.lock | 5 +-
rust/bql/Cargo.toml | 3 -
rust/bql/meson.build | 1 -
rust/bql/src/cell.rs | 23 +-
rust/meson.build | 2 +-
rust/migration/Cargo.toml | 2 +
rust/migration/meson.build | 7 +-
rust/migration/src/lib.rs | 5 +
rust/migration/src/migratable.rs | 473 ++++++++++++++++++++++++
rust/migration/src/vmstate.rs | 85 +++--
rust/qemu-macros/src/lib.rs | 88 +++++
rust/qemu-macros/src/migration_state.rs | 296 +++++++++++++++
rust/qemu-macros/src/tests.rs | 112 +++++-
rust/util/src/timer.rs | 10 +-
17 files changed, 1071 insertions(+), 56 deletions(-)
create mode 100644 rust/migration/src/migratable.rs
create mode 100644 rust/qemu-macros/src/migration_state.rs
--
2.51.0
