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CHANGELOG.md

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Changelog

Notable changes to Xen will be documented in this file.

The format is based on Keep a Changelog

unstable UNRELEASED - 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.

4.15.0 UNRELEASED - 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 - 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 - 2019-12-17

Pointer to release from which CHANGELOG tracking starts