# Changelog

## Upcoming version

### Added
### Changed
### Fixed
### Removed
### Deprecated

## [v0.14.1]

### Fixed
- [[#279](https://github.com/rust-vmm/vm-memory/pull/279)] Remove restriction from `read_volatile_from` and `write_volatile_into`
  that made it copy data it chunks of 4096.

## [v0.14.0]

### Added
- [[#266](https://github.com/rust-vmm/vm-memory/pull/266)] Derive `Debug` for several
  types that were missing it.

### Changed
- [[#274](https://github.com/rust-vmm/vm-memory/pull/274)] Drop `Default` as requirement for `ByteValued`.

## [v0.13.1]

### Added

- [[#256](https://github.com/rust-vmm/vm-memory/pull/256)] Implement `WriteVolatile`
  for `std::io::Stdout`.
- [[#256](https://github.com/rust-vmm/vm-memory/pull/256)] Implement `WriteVolatile`
  for `std::vec::Vec`.
- [[#256](https://github.com/rust-vmm/vm-memory/pull/256)] Implement `WriteVolatile`
  for `Cursor<&mut [u8]>`.
- [[#256](https://github.com/rust-vmm/vm-memory/pull/256)] Implement `ReadVolatile`
  for `Cursor<T: AsRef[u8]>`.

## [v0.13.0]

### Added
- [[#247]](https://github.com/rust-vmm/vm-memory/pull/247) Add `ReadVolatile` and
  `WriteVolatile` traits which are equivalents of `Read`/`Write` with volatile
  access semantics.

### Changed

- [[#247]](https://github.com/rust-vmm/vm-memory/pull/247) Deprecate
  `Bytes::{read_from, read_exact_from, write_to, write_all_to}`. Instead use
  `ReadVolatile`/`WriteVolatile`, which do not incur the performance penalty
  of copying to hypervisor memory due to `Read`/`Write` being incompatible
  with volatile semantics (see also #217).


## [v0.12.2]

### Fixed
- [[#251]](https://github.com/rust-vmm/vm-memory/pull/251): Inserted checks
  that verify that the value returned by `VolatileMemory::get_slice` is of
  the correct length.

### Deprecated
- [[#244]](https://github.com/rust-vmm/vm-memory/pull/241) Deprecate volatile
  memory's `as_ptr()` interfaces. The new interfaces to be used instead are:
  `ptr_guard()` and `ptr_guard_mut()`.

## [v0.12.1]

### Fixed
- [[#241]](https://github.com/rust-vmm/vm-memory/pull/245) mmap_xen: Don't drop
  the FileOffset while in use #245

## [v0.12.0]

### Added
- [[#241]](https://github.com/rust-vmm/vm-memory/pull/241) Add Xen memory
  mapping support: Foreign and Grant. Add new API for accessing pointers to
  volatile slices, as `as_ptr()` can't be used with Xen's Grant mapping.
- [[#237]](https://github.com/rust-vmm/vm-memory/pull/237) Implement `ByteValued` for `i/u128`.

## [v0.11.0]

### Added
- [[#216]](https://github.com/rust-vmm/vm-memory/pull/216) Add `GuestRegionMmap::from_region`.

### Fixed
- [[#217]](https://github.com/rust-vmm/vm-memory/pull/217) Fix vm-memory internally
  taking rust-style slices to guest memory in ways that could potentially cause 
  undefined behavior. Removes/deprecates various `as_slice`/`as_slice_mut` methods
  whose usage violated rust's aliasing rules, as well as an unsound 
  `impl<'a> VolatileMemory for &'a mut [u8]`.

## [v0.10.0]

### Changed
- [[#208]](https://github.com/rust-vmm/vm-memory/issues/208) Updated
  vmm-sys-util dependency to v0.11.0
- [[#203]](https://github.com/rust-vmm/vm-memory/pull/203) Switched to Rust
  edition 2021.

## [v0.9.0]

### Fixed

- [[#195]](https://github.com/rust-vmm/vm-memory/issues/195):
  `mmap::check_file_offset` is doing the correct size validation for block and
  char devices as well.

### Changed

- [[#198]](https://github.com/rust-vmm/vm-memory/pull/198): atomic: enable 64
  bit atomics on ppc64le and s390x.
- [[#200]](https://github.com/rust-vmm/vm-memory/pull/200): docs: enable all
  features in `docs.rs`.
- [[#199]](https://github.com/rust-vmm/vm-memory/issues/199): Update the way
  the dependencies are pulled such that we don't end up with incompatible
  versions.

## [v0.8.0]

### Fixed

- [[#190]](https://github.com/rust-vmm/vm-memory/pull/190):
  `VolatileSlice::read/write` when input slice is empty.

## [v0.7.0]

### Changed

- [[#176]](https://github.com/rust-vmm/vm-memory/pull/176): Relax the trait
  bounds of `Bytes` auto impl for `T: GuestMemory`
- [[#178]](https://github.com/rust-vmm/vm-memory/pull/178):
  `MmapRegion::build_raw` no longer requires that the length of the region is a
  multiple of the page size.

## [v0.6.0]

### Added

  - [[#160]](https://github.com/rust-vmm/vm-memory/pull/160): Add `ArcRef` and `AtomicBitmapArc` bitmap
    backend implementations.
  - [[#149]](https://github.com/rust-vmm/vm-memory/issues/149): Implement builder for MmapRegion.
  - [[#140]](https://github.com/rust-vmm/vm-memory/issues/140): Add dirty bitmap tracking abstractions. 

### Deprecated 

  - [[#133]](https://github.com/rust-vmm/vm-memory/issues/8): Deprecate `GuestMemory::with_regions()`,
   `GuestMemory::with_regions_mut()`, `GuestMemory::map_and_fold()`.

## [v0.5.0]

### Added

- [[#8]](https://github.com/rust-vmm/vm-memory/issues/8): Add GuestMemory method to return an Iterator
- [[#120]](https://github.com/rust-vmm/vm-memory/pull/120): Add is_hugetlbfs() to GuestMemoryRegion
- [[#126]](https://github.com/rust-vmm/vm-memory/pull/126): Add VolatileSlice::split_at()
- [[#128]](https://github.com/rust-vmm/vm-memory/pull/128): Add VolatileSlice::subslice()

## [v0.4.0]

### Fixed

- [[#100]](https://github.com/rust-vmm/vm-memory/issues/100): Performance
  degradation after fixing [#95](https://github.com/rust-vmm/vm-memory/pull/95).
- [[#122]](https://github.com/rust-vmm/vm-memory/pull/122): atomic,
  Cargo.toml: Update for arc-swap 1.0.0.

## [v0.3.0]

### Added

- [[#109]](https://github.com/rust-vmm/vm-memory/pull/109): Added `build_raw` to
  `MmapRegion` which can be used to operate on externally created mappings.
- [[#101]](https://github.com/rust-vmm/vm-memory/pull/101): Added `check_range` for
  GuestMemory which could be used to validate a range of guest memory.
- [[#115]](https://github.com/rust-vmm/vm-memory/pull/115): Add methods for atomic
  access to `Bytes`.

### Fixed

- [[#93]](https://github.com/rust-vmm/vm-memory/issues/93): DoS issue when using
  virtio with rust-vmm/vm-memory.
- [[#106]](https://github.com/rust-vmm/vm-memory/issues/106): Asserts trigger
  on zero-length access.  

### Removed

- `integer-atomics` is no longer a distinct feature of the crate.

## [v0.2.0]

### Added

- [[#76]](https://github.com/rust-vmm/vm-memory/issues/76): Added `get_slice` and
  `as_volatile_slice` to `GuestMemoryRegion`.
- [[#82]](https://github.com/rust-vmm/vm-memory/issues/82): Added `Clone` bound
  for `GuestAddressSpace::T`, the return value of `GuestAddressSpace::memory()`.
- [[#88]](https://github.com/rust-vmm/vm-memory/issues/88): Added `as_bytes` for
  `ByteValued` which can be used for reading into POD structures from
  raw bytes.

## [v0.1.0]

### Added

- Added traits for working with VM memory.
- Added a mmap based implemention for the Guest Memory.
