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# Changelog
Notable changes to Xen will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
## [unstable UNRELEASED](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=staging) - TBD
### Removed
- XENSTORED_ROOTDIR environment variable from configuartion files and
initscripts, due to being unused.
### Changed
- Quarantining of passed-through PCI devices no longer defaults to directing I/O to a scratch
page, matching original post-XSA-302 behavior (albeit the change was also backported, first
appearing in 4.12.2 and 4.11.4). Prior (4.13...4.15-like) behavior can be arranged for
either by enabling the IOMMU_QUARANTINE_SCRATCH_PAGE setting at build (configuration) time
or by passing "iommu=quarantine=scratch-page" on the hypervisor command line.
- pv-grub stubdoms will no longer be built per default. In order to be able to use pv-grub
configure needs to be called with "--enable-pv-grub" as parameter.
## [4.15.0 UNRELEASED](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.15.0) - TBD
### Added / support upgraded
- ARM IOREQ servers (device emulation etc.) (Tech Preview)
- Renesas IPMMU-VMSA (Supported, not security supported; was Tech Preview)
- ARM SMMUv3 (Tech Preview)
- Switched MSR accesses to deny by default policy.
- Intel Processor Trace support (Tech Preview)
- Named PCI devices for xl/libxl
- Improved documentation for xl PCI configuration format
- Support for zstd-compressed dom0 (x86) and domU kernels
- EFI: Enable booting unified hypervisor/kernel/initrd/DT images
- Reduce ACPI verbosity by default
- Add ucode=allow-same option to test late microcode loading path
- Library improvements from NetBSD ports upstreamed
- CI loop: Add Alpine Linux, Ubuntu Focal targets; drop CentOS 6
- CI loop: Add qemu-based dom0 / domU test for ARM
- CI loop: Add dom0less aarch64 smoke test
- x86: Allow domains to use AVX-VNNI instructions
- Factored out HVM-specific shadow code, improving code clarity and reducing the size of PV-only hypervisor builds
- Added XEN_SCRIPT_DIR configuration option to specify location for Xen scripts, rather than hard-coding /etc/xen/scripts
- xennet: Documented a way for the backend (or toolstack) to specify MTU to the frontend
- xenstore can now be live-updated on a running system. (Tech preview)
- Some additional affordances in various xl subcommands.
- Added workarounds for the following ARM errata: Cortex A53 #843419, Cortex A55 #1530923, Cortex A72 #853709, Cortex A73 #858921, Cortex A76 #1286807, Neoverse-N1 #1165522
- On detecting a host crash, some debug key handlers can automatically triggered to aid in debugging
- Increase the maximum number of guests which can share a single IRQ from 7 to 16, and make this configurable with irq-max-guests
### Removed / support downgraded
- qemu-xen-traditional as host process device model, now "No security
support, not recommended". (Use as stub domain device model is still
supported - see SUPPORT.md.)
## [4.14.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.14.0) - 2020-07-23
### Added
- This file and MAINTAINERS entry.
- Use x2APIC mode whenever available, regardless of interrupt remapping
support.
- Performance improvements to guest assisted TLB flushes, either when using
the Xen hypercall interface or the viridian one.
- Assorted pvshim performance and scalability improvements plus some bug
fixes.
- Hypervisor framework to ease porting Xen to run on hypervisors.
- Initial support to run on Hyper-V.
- Initial hypervisor file system (hypfs) support.
- libxl support for running qemu-xen device model in a linux stubdomain.
- New 'domid_policy', allowing domain-ids to be randomly chosen.
- Option to preserve domain-id across migrate or save+restore.
- Support in kdd for initial KD protocol handshake for Win 7, 8 and 10 (64 bit).
- Tech preview support for Control-flow Execution Technology, with Xen using
Supervisor Shadow Stacks for its own protection.
### Changed
- The CPUID data seen by a guest on boot is now moved in the migration
stream. A guest migrating between non-identical hardware will now no
longer observe details such as Family/Model/Stepping, Cache, etc changing.
An administrator still needs to take care to ensure the features visible to
the guest at boot are compatible with anywhere it might migrate.
## [4.13.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.13.0) - 2019-12-17
> Pointer to release from which CHANGELOG tracking starts
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