Linux, FreeBSD and other OSes that utilise the new features
Greater Ecosystem
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General Hypervisor Updates
The memory event subsystem has been reworked and extended to a new VM event subsystem. The new VM event subsystems supports both the ARM and x86 architectures. It can be used to intercept all sorts of VM events, such as memory access, register access and more. This enables security applications such as zero-footprint guest introspection, host-wide monitoring and many others. Have a look at Tamas’s presentations and Steve’s presentations on this topic to get more insights.
The Xen Security Modules(XSM) now have a default policy that is regularly tested in the Xen Project Test Lab to make sure it is not broken by mistake. This will enable us to switch on XSM by default in the future.
vTPM 2.0 support has been contributed by Intel and the US National Security Agency. To learn more about how to use vTPM and how it can makeyour host more secure, go to our wiki.
Grant table scalability has been improvement significantly by using finer-grained locks in grant tables. In some scenarios aggregate intrahost network throughput has been shown to improve by 100%. Other I/O drivers in Xen should potentially show significant performance improvements as well.
We introduced ticket lock to improve fairness, which provides bettersupport of massive workloads from up to hundreds or thousands of VMs ona single host.
The unused SEDF scheduler has been removed from the hypervisor and toolstack. The Xen Project is committed to actively remove unused code to keep the code base small and to minimize security risks.
We removed Mini-OSfrom the Xen code base into its own tree. Mini-OS started as a demonstration OS, but received significant contributions in recent years(e.g. it is used by many Unikernels). We decide to treat it as a separately maintained independent project with it’s own mailing list andcode tree to make it easier to consume. We hope this will help unikernel communities to more easily consume and contribute to Mini-OS, while reducing the Xen Project Hypervisor footprint.
x86-specific Hypervisor Updates
The Intel>
Intel Page Modification Logging Technology offloads the page dirty logging duty to hardware. Microbenchmark shows about 7% improvement in SPECJbb and should be particularly beneficial for Live Migration.
Intel Cache Allocation Technologyallows system administrators to assign more L3 cache capacity to individual VMs, resulting in lower latency and higher performance for high-priority workloads such as NFV, real-time and video-on-demand applications.
Intel Memory Bandwidth Monitoringallows system administrators to>
Intel Reserve Memory Region reporting provides a mechanism to reportand reserve memory regions for legacy devices to allow for safe device passthrough.
Virtual Performance Monitoring Unit support makes it possible to profile the Xen Project Hypervisor with the Linux perf tool. Note that some work still needs to be completed within Linux to make perf fully functional.
Virtual NUMA for HVM guest is a continuation of the NUMA work performed in Xen 4.5 and previous>
ARM-specific Hypervisor Updates
The supported number of VCPUs has been increased from 8 to 128 VCPUs on ARM64 platforms.
Passthrough for non-PCI devices allows users to passthrough devices via partial device trees. Full support for PCI device passthrough is currently being worked on.
ARM GICv2 on GICv3 support.
32 bit userspace in 64 bit guest support.
OVMF for ARM contributed by Linaro.
64K page ARM guest support.
Support for the following new Hardware Platforms has been added: Renesas R-Car Gen2, Thunder X, Huawei hip04-d04 and Xilinx ZynqMP SoC.
Toolstack Updates
Live Migration support in libxc / libxl and has been replaced with acompletely new implementation (Migration v2). The new version respects different layers in the Xen Software stack and has been designed to be more robust and extensible to better support next-generation infrastructures and work planned in subsequent hypervisor>
Remus – our High Availability solution – has been reworked and is now based on Migration v2.
Libxl asynchronous operations can now be cancelled. This allows libxl users to cancel long-running asynchronous operations and benefits tool stacks such as libvirt and is beneficial for integration with cloudorchestration stacks.
Improved SPICE/QXL support.
AHCI disk controller support.
A new host I/O topology query interface gives upper layer in the software stack the ability to>
Addition of Xenalyze, which is a tool for analyzing Hypervisor tracebuffers and can be used for debugging and optimization, has been added to the Xen Project codebase as a maintained feature.
Xen Project Test Lab Updates
During the Xen 4.6>
XSM
Stub Domain
VM migration using libvirt between two hosts is now tested.
Live Migration between hosts of different Xen versions is now testedand will help>
Test with different disk formats such as QCOW2, VHD and raw format.
More test cases are in the pipeline, including test case for OpenStack’s devstack, performance and scalability tests, FreeBSD Dom0 etc. Linux, FreeBSD and other OSes
During the Xen 4.6>
Xen blkfront multiqueue and multipage ring support.
Xen SCSI frontend and backend support.
VPMU kernel support.
Performance improvement in mmap call.
P2M in PV guest can address 512GB or more.
For FreeBSD there were these improvements:
Experimental PVH Dom0/DomU support.
Removal of>
Blkfront indirect descriptor support by FreeBSD developer Colin Percival.
Removal of broken FreeBSD specific blkfront/back extensions.
ARM32 and ARM64 guest support are underway.
Greater Ecosystem
Project Raisin provides an easier way to build and package Xen. It also includes a basic test suite for developer to test their changes.
Our OpenStack CI loop is up and running and is testing OpenStack changes against the Xen Project Hypervisor
Xen Hypervisor support moved from quality group C to group B in OpenStack.
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