1# Changelog 2 3Notable changes to Xen will be documented in this file. 4 5The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) 6 7## [Unreleased](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog) 8 9### Added 10 - This file and MAINTAINERS entry. 11 - Use x2APIC mode whenever available, regardless of interrupt remapping 12 support. 13 - Performance improvements to guest assisted TLB flushes, either when using 14 the Xen hypercall interface or the viridian one. 15 - Assorted pvshim performance and scalability improvements plus some bug 16 fixes. 17 - Hypervisor framework to ease porting Xen to run on hypervisors. 18 - Initial support to run on Hyper-V. 19 - Initial hypervisor file system (hypfs) support. 20 - libxl support for running qemu-xen device model in a linux stubdomain. 21 - New 'domid_policy', allowing domain-ids to be randomly chosen. 22 - Option to preserve domain-id across migrate or save+restore. 23 - Support in kdd for initial KD protocol handshake for Win 7, 8 and 10 (64 bit). 24 - Tech preview support for Control-flow Execution Technology, with Xen using 25 Supervisor Shadow Stacks for its own protection. 26 27### Changed 28 - The CPUID data seen by a guest on boot is now moved in the migration 29 stream. A guest migrating between non-identical hardware will now no 30 longer observe details such as Family/Model/Stepping, Cache, etc changing. 31 An administrator still needs to take care to ensure the features visible to 32 the guest at boot are compatible with anywhere it might migrate. 33 34## [4.13.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.13.0) - 2019-12-17 35 36> Pointer to release from which CHANGELOG tracking starts 37