XPDDS18: Xen Testing at Intel - Xudong Hao, Intel

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ARM Architecture-based System Virtualization: Xen ARM open source software pr...

Xen role, details of implementation and problems in a sample solution based on OSS (Android, Linux and Xen) that addresses Automotive requirements such as ultra-fast RVC boot time, quick IVI system boot time, cloud connectivity and multimedia capabilities, reliability and security through hardware virtualization. Secure CAN/LIN/MOST bus integration handled by Linux on Dom0 while Android runs customizable QML-based HMI in a sandbox of DomU. These case studies will include but not be limited to: computing power requirements, memory requirements, virtualization, stability, boot-time sequence and optimization, video clips showing results of the work done. Case study is built on TexasInstruments OMAP5 SoC.

XPDS13: Xen in OSS based In–Vehicle Infotainment Systems - Artem Mygaiev, Glo...

The Linux Foundation

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The Linux Foundation

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The Linux Foundation

The Xen domU create/destroy and device hotplug rely on xenwatch kernel thread to run xenwatch event callback function for each subscribed xenstore node update. Any event callback function hang would stall the only single xenwatch thread and forbid further domU create/destroy or device hotplug. This talk presents how Xenwatch Multithreading can address the xenwatch stall issue. In addition to the default xenwatch thread, the dom0 will create a per-domU kernel thread for each domU to handle their own xenwatch event. Therefore, domU create/destroy or device hotplug are still allowed even when a specific per-domU xenwatch thread is stalled. This talk first discusses the limitation in single-threaded xenwatch design with some case studies, then explains the basic knowledge on paravirtual driver, and finally presents the challenge, design and implementation of xenwatch multithreading.

XPDDS18: Xenwatch Multithreading - Dongli Zhang, Oracle

The Linux Foundation

Autonomous vehicles need to run robust autopilot software in resource-constrained environments. Such vehicles are increasingly built on ARM platforms with resources to spare. We have begun investigating the feasibility of using this spare capacity to implement other interesting services on these vehicles by using Xen to separate the real-time autopilot software from a richer, non-real-time Linux system. In order to make this work, we have ported FreeRTOS, a popular minimal operating system for microcontrollers, to run as a Xen guest on the ARM Cortex A15.

XPDS14: Porting FreeRTOS to Xen on the ARM Cortex A15 - Jonathan Daugherty, G...

The Linux Foundation

The accompanying demo (slide 15) can be found at https://vimeo.com/90534015 The presentation will cover Xen vs Xen Automotive gaps and analysis. We will elaborate technical solutions for the identified gaps: * ARM architecture - support HW virtualization extensions for embedded systems * Stability requirements * RT Scheduler * Rich virtualized peripheral support (WiFi, Gfx, MM, USB, etc.) * Performance benchmarking * Security The audience is anyone interesting in building OSS based IVI systems. Attendees can expect the OSS stack detailed architecture, current status of the project, the challenges seen, road map and much more.

LFCollab14: Xen vs Xen Automotive

The Linux Foundation

In recent years Xen has seen the development of many minimalistic or specialized virtual machines (e.g., OSv, Mirage, ClickOS, Erlang on Xen, etc.). Thanks in part to a small CPU and memory footprints, these VMs allow for running thousands or more on a single, inexpensive commodity server. Doing so could save cloud and network operators vast amounts of money. Attempts to do so are already underway and have discovered important bottlenecks in Xen. While some of these have already been addressed by the community (e.g., limited number of event channels or memory grants) others still remain. In this talk we describe our experience when trying to run up to 10,000 MiniOS-based VMs, including bottlenecks in the XenStore, toolchain and network pipe. We further report on prototypical solutions, and on our implementation of suspend/resume for MiniOS that allows us tens of milliseconds migrations.

XPDS14 - Towards Massive Server Consolidation - Filipe Manco, NEC

The Linux Foundation

Electricity charge for operating data centers is reaching approximately 27% of total operation cost. For this reason, ARM servers have been getting more attention for future energy-efficient data centers and the performance of ARM processors keeps increasing (i.e., almost 3GHz). For efficiently utilizing ARM cores, ARM PVH has been introduced in Xen 4.3, and based on this, we have implemented live migration feature and evaluated on top of dualcore ARM board. More specifically, we choose multimedia streaming workload, measure the maximum concurrent clients, and calculate clients per watt (CPW) as the performance metric. From this, we have found out that even dualcore ARM processor (with virtualization) gives higher CPW (7 CPW) over x86 case (6 CPW). In addition we could reduce the energy consumption around 70% (4-to-1 consolidation for low-loaded servers) by using server consolidation.

XPDS13: Performance Evaluation of Live Migration based on Xen ARM PVH - Jaeyo...

The Linux Foundation

Software Guard Extensions (SGX) is Intel's unique security feature which has been present in Intel's processors since Skylake generation. Existing HW/SW solutions hypervisor does not protect tenants against the cloud provider and thus the supplied operating system and hardware. Intel SGX solves this by using enclave, which is a protected portion of userspace application where the code/data cannot be accessed directly from outside by any software, including privileged ones, such as BIOS and VMM. This discussion is intended for the deep dive introduction to SGX, and the design discussion of adding SGX virtualization to Xen. We will start with SGX deep dive, and then go into SGX virtualization design, from high level design to details, such as EPC management/virtualization, CPUID handling, interaction with VMX, live migration support, etc.

XPDDS18: Design Session - SGX deep dive and SGX Virtualization Discussion, Ka...

The Linux Foundation

STATUS UPDATE OF COLO PROJECT XIAOWEI YANG, HUAWEI AND WILL AULD, INTEL

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Hardware performance monitoring facilities such as counters can provide invaluable information about system behavior. In recent years, Linux 'perf' has become the standard tool for managing these facilities and interpreting data that they generate. In this talk we will discuss changes to Xen and Linux that will allow PV guests (including dom0) use perf for profiling themselves and, in the case of dom0, the hypervisor.

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The Linux Foundation

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ALSS14: Xen Project Automotive Hypervisor (Demo)

The Linux Foundation

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Mobile devices, such as smart phones and tablets, are becoming de-facto everyday computing and communication devices, virtualization can bring additional benfits to mobile devices for both security and manageability. IT department may use hypervisor, as a highly secure solution, to manage autherized mobile devices, such as for network traffic monitoring, filtering, scan (for virus detection), and/or OS update/patching even when the guest OS becomes completely dead. We insert Xen to the mobile OS Android to deprivilege Android as guest for security and manageability purpose. However, the usage case of mobile device is quit different with that of server, for example mobile devices runs completely different benchmarks (mostly multimedia focused) vs. that in server (mostly responsiveness focused). We analyze the gap of Xen as a mobile hypervisor and present how we improve the performance.

XPDS13: Performance Optimization on Xen-based Android Device - Jack Ren, Inte...

The Linux Foundation

Huawei Cloud applies xen platform to many customer scenarios. This talk will introduce our optimizations on the xen platform to solve problems occuring in these scenarios. E.g 1. Redesign the implementation of kernel locks to improve the scalability of the Xen platform in large-scale server scenarios. 2. Develop LazyFPU and L3 cache affinity features to improve virtual machine performance in SAP HANA database service scenarios. 3. Develop HostNUMA and GuestNUMA features to enhance virtual machine performance in specvirt test and desktop cloud scenarios. 4. Shorten the time cost of concurrent life-cycle operations for large scales of virtual machines, to achieve quick change of classes in the cloud classroom.

XPDDS18: Performance tuning on Xen platform - Bo Zhang & Yifei Jiang, Huawei

The Linux Foundation

XPDS13: In-Guest Mechanism to Strengthen Guest Separation - Philip Tricca, Ci...

The Linux Foundation

TrenchBoot is a cross-community OSS integration project for hardware-rooted, late launch integrity of open and proprietary systems. It provides a general purpose, open-source DRTM kernel for measured system launch and attestation of device integrity to trust-centric access infrastructure. TrenchBoot closes the UEFI Measurement Gap and reduces the need to trust system firmware. This talk will introduce TrenchBoot architecture and a recent collaboration with Oracle to launch the Linux kernel directly with Intel TXT or AMD SVM Secure Launch. It will propose mechanisms for integrating the Xen hypervisor into a TrenchBoot system launch. DRTM-enabled capabilities for client, server and embedded platforms will be presented for consideration by the Xen community.

XPDDS19: How TrenchBoot is Enabling Measured Launch for Open-Source Platform ...

The Linux Foundation

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ARM Architecture-based System Virtualization: Xen ARM open source software pr...

XPDS13: Xen in OSS based In–Vehicle Infotainment Systems - Artem Mygaiev, Glo...

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XPDDS18: Xenwatch Multithreading - Dongli Zhang, Oracle

XPDS14: Porting FreeRTOS to Xen on the ARM Cortex A15 - Jonathan Daugherty, G...

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XPDS14 - Towards Massive Server Consolidation - Filipe Manco, NEC

XPDS13: Performance Evaluation of Live Migration based on Xen ARM PVH - Jaeyo...

XPDDS18: Design Session - SGX deep dive and SGX Virtualization Discussion, Ka...

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XPDS13: Performance Optimization on Xen-based Android Device - Jack Ren, Inte...

XPDDS18: Performance tuning on Xen platform - Bo Zhang & Yifei Jiang, Huawei

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These are the slides....but you need to watch the replay so you can benefit from the demo! This was easily one of our most popular sessions with a HUGE number of attendees smashing previous records. REPLAY: cs.co/9001BMjah Q&A Added on Nov 3, 2015: http://www.slideshare.net/robboyd/qa-from-cisco-modeling-labs-workshop DESCRIPTION: Building physical networks can be a slow, painful, and repetitive task. We often spend more time building the physical aspects of rack, cabling, and configuring and end up rushing the actual work. In Simulating Networks using Cisco Modeling Labs, we will look at how you can simplify the building of labs using network virtualization. What is the architecture behind the system, the type of routers and switches you can use, the performance and capacity considerations, a demonstration of the product, and finally the gotchas for planning and building a virtual network.

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For the full video of this presentation, please visit: https://www.embedded-vision.com/platinum-members/embedded-vision-alliance/embedded-vision-training/videos/pages/mar-2018-alliance-vitf-facebook For more information about embedded vision, please visit: http://www.embedded-vision.com Fei Sun, software engineer at Facebook, delivers the presentation "The Caffe2 Framework for Mobile and Embedded Deep Learning" at the Embedded Vision Alliance's March 2018 Vision Industry and Technology Forum. Sun introduces Caffe2, a new open-source machine learning framework, and explains how Facebook is using it to enable computer vision in mobile and embedded devices.

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Apache Kafka is the most popular open-source stream-processing software for collecting, processing, storing, and analyzing data at scale. Most known for its excellent performance, low latency, fault tolerance, and high throughput, it's capable of handling thousands of messages per second. For mission-critical applications, how do you ensure that the performance delivered is the performance required? This is especially important as Kafka is written in Java and Scala and runs on the JVM. The JVM is a fantastic platform that delivers on an internet scale. In this session, we'll explore how making changes to the JVM design can eliminate the problems of garbage collection pauses and raise the throughput of applications. For cloud-based Kafka applications, this can deliver both lower latency and reduced infrastructure costs. All without changing a line of code!

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Surge 2014: From Clouds to Roots: root cause performance analysis at Netflix. Brendan Gregg. At Netflix, high scale and fast deployment rule. The possibilities for failure are endless, and the environment excels at handling this, regularly tested and exercised by the simian army. But, when this environment automatically works around systemic issues that aren’t root-caused, they can grow over time. This talk describes the challenge of not just handling failures of scale on the Netflix cloud, but also new approaches and tools for quickly diagnosing their root cause in an ever changing environment.

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Static partitioning is used to split an embedded system into multiple domains, each of them having access only to a portion of the hardware on the SoC. It is key to enable mixed-criticality scenarios, where a critical application, often based on a small RTOS, runs alongside a larger non-critical app, typically based on Linux. The two domains cannot interfere with each other. This talk will explain how to use Xen for static partitioning. It will introduce dom0-less, a new Xen feature written for the purpose. Dom0-less allows multiple VMs to start at boot time directly from the Xen hypervisor, decreasing boot times drastically. It makes it very easy to partition the system without virtualization overhead. Dom0 becomes unnecessary. This presentation will go into details on how to setup a Xen dom0-less system. It will show configuration examples and explain device assignment. The talk will discuss its implications for latency-sensitive and safety-critical environments.

ELC2019: Static Partitioning Made Simple

The Linux Foundation

Artem will briefly cover what has been done since the first talk on Xen in Automotive domain back in 2013, what is going on now and what is still missing for broad adaptation of Xen in vehicles. The following topics will be covered: Embedded/automotive features of Xen Collaboration with AGL and GENIVI organizations for standardization Efforts on Functional Safety compliance Artem will also go over typical automotive use scenarios for Xen which may not be the same as generic computing use of hypervisor.

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In recent years unikernels have shown immense performance potential (e.g., boot times of only a few ms, image sizes of only hundreds of KBs).The fundamental drawback of unikernels is that they require that applications be manually ported to the underlying minimalistic OS, needing both expert work and often considerable amount of time. The Unikraft project provides a unikernel code base and build system that significantly simplifies the building of unikernels. In addition to support for a number CPU architectures, languages and frameworks, Unikraft provides debugging and tracing features that are generally sorely missing from unikernel projects. In this talk we will talk about these features, show a set of preliminary performance numbers, and provide a roadmap for the project's future.

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This talk will introduce Dom0-less: a new way of using Xen to build mixed-criticality solutions. Dom0-less is a Xen feature that adds a novel approach to static partitioning based on virtualization. It allows multiple domains to start at boot time directly from the Xen hypervisor, decreasing boot times dramatically. Xen userspace tools, such as xl and libvirt, become optional. Dom0-less extends the existing device tree based Xen boot protocol to cover information required by additional domains. Binaries, such as kernels and ramdisks, are loaded by the bootloader (u-boot) and advertised to Xen via new device tree bindings. The audience will learn how to use Dom0-less to partition the system. Uboot and device tree configuration details will be explained to enable the audience to get the most out of this feature. The talk will include a status update and details on future plans.

XPDDS19 Keynote: Xen Dom0-less - Stefano Stabellini, Principal Engineer, Xilinx

The Linux Foundation

As the number of contributions grow, reviewer bandwidth becomes a bottleneck; and maintainers are always asking for more help. However, ultimately maintainers must at least Ack every patch that goes in; so if you're not a maintainer, how can you contribute? Why should anyone care about your opinion? This talk will try to lay out some advice and guidelines for non-maintainers, for how they can do code review in a way which will effectively reduce the load on maintainers when they do come to review a patch.

XPDDS19 Keynote: Patch Review for Non-maintainers - George Dunlap, Citrix Sys...

The Linux Foundation

This talk is a follow-up to our Summit 2017 presentation in which we covered our plans for Intel VMFUNC and #VE, as well as related use-cases. This year, we will provide a report on what we have accomplished in Xen 4.12, and what remains to be addressed. We will also give a brief status update of VMI on AMD hardware. The session will end with some real-world numbers of the Hypervisor Introspection solution running on Citrix Hypervisor 8.0 with #VE enabled.

XPDDS19: Memories of a VM Funk - Mihai Donțu, Bitdefender

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Safety certification is one of the essential requirements for software to be used in highly regulated industries. Besides technical and compliance issues (such as ISO 26262 vs IEC 611508) transitioning an existing project to become more easily safety certifiable requires significant changes to development practices within an open source project. In this session, we will lay out some challenges of making safety certification achievable in open source and the Xen Project. We will outline the process the Xen Project has followed thus far and highlight lessons learned along the way. The talk will primarily focus on necessary process, tooling changes and community challenges that can prevent progress. We will be offering an in-depth review of how Xen Project is approaching this challenging goal and try to derive lessons for other projects and contributors.

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Safety certification is one of the essential requirements for software to be used in highly regulated industries. The Xen Project, a secure and stable hypervisor that is used in many different markets, has been exploring the feasibility of building safety certified products on top of Xen for a year, looking at key aspects of its code base and development practices. In this session, we will lay out the motivation and challenges of making safety certification achievable in open source and the Xen Project. We will outline the process the project has followed thus far and highlight lessons learned along the way. The talk will cover technical enablers, necessary process and tooling changes and community challenges offering an in-depth review of how Xen Project is approaching this exciting and and challenging goal.

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2018 saw fundamental shifts in security boundaries which were previously taken for granted. A lot of work has been done in the past 2 years, and largely in secret under embargo, but there is plenty more work to be done to strengthen the existing mitigations and to try to recover some performance without reopening security holes. This talk will look at speculative execution sidechannels, the work which has already been done to mitigate the security holes, and future work which hopes to bring some improvements.

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The Arm architecture provides a set of guidelines that any software should abide by when accessing the memory with MMU off and update page-tables. Failing to do so may result in getting TLB conflicts or breaking coherency. In a previous talk ("Keeping coherency on Arm"), we focused on updating safely the stage-2 (aka P2M) page-tables. This talk will focus on the boot code and Xen memory management. During this session, we will introduce some of the guidelines and when they should be used. We will also discuss how Xen boot sequence needs to be reworked to avoid breaking the guidelines.

XPDDS19: Keeping Coherency on Arm: Reborn - Julien Grall, Arm ltd

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For many years the QEMU codebase has contained PV backends for Xen guests, giving them paravirtual access to storage, network, keyboard, mouse, etc. however these backends have not been configurable as QEMU devices as their implementation did not fully adhere to the QEMU Object Model (QOM). Particularly the PV storage backend not using proper QOM devices, or qdevs, meant that the QEMU block layer needed to maintain legacy code that was cluttering up the source. This was causing push-back from the maintainers who did not want to accept any patches relating to that Xen backend until it was 'qdevified'. In this talk, I'll explain the modifications I made to QEMU to achieve 'qdevification' of the PV storage backend, how compatibility with the libxl toolstack was maintained, and what the next steps in both QEMU and libxl development should be.

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PCI is a local computer bus for attaching hardware devices in a computer, and is the main peripheral bus on modern x86 systems. As such, having a proper way to emulate it is crucial for Xen to be able to expose both fully emulated devices or passthrough devices to guests. This talk will focus on the current status of PCI emulation in Xen, how and where it is used, what are its main limitations and future plans to improve it in order to be more robust and modular.

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Xen is a very powerful hypervisor with a talented and diverse developers community. Despite the fact it's almost everywhere (from the Cloud to the embedded world), it can be difficult to set up and manage as a system administrator. General purpose distros have Xen packages, but that's just a start in your Xen journey: you need some tooling and knowledge to have a working and scalable platform. XCP-ng was built to overcome those issues: by bringing Xen to the masses with a fully turnkey distro with Xen as its core. It's the logical sequel to the XCP project, with a community focus from the start. We'll see how it happened, what we did, and what's next. Finally, we'll see the impact of XCP-ng on the Xen Project.

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High level toolstacks for server and cloud virtualization are very mature with large communities using and supporting them. Client virtualization is a much more niche community with unique requirements when compared to those found in the server space. In this talk, we’ll introduce a client virtualization toolstack for Xen (redctl) that we are using in Redfield, a new open-source client virtualization distribution that builds upon the work done by the greater virtualization and Linux communities. We will present a case for maturing libxl’s Go bindings and discuss what advantages Go has to offer for high level toolstacks, including in the server space.

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Today Xen is scheduling guest virtual cpus on all available physical cpus independently from each other. Recent security issues on modern processors (e.g. L1TF) require to turn off hyperthreading for best security in order to avoid leaking information from one hyperthread to the other. One way to avoid having to turn off hyperthreading is to only ever schedule virtual cpus of the same guest on one physical core at the same time. This is called core scheduling. This presentation shows results from the effort to implement core scheduling in the Xen hypervisor. The basic modifications in Xen are presented and performance numbers with core scheduling active are shown.

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The use of Virtual GPUs (vGPUs) has widely grown in server farms to give Virtual Machines (VMs) dedicated graphics. Software rendering with virtual CPUs can only take us so far and even with Intel-GVT, which uses integrated graphics, there isn't enough power to do the fun stuff. In this presentation, Jon Farrell will be talking about the process of implementing AMD MxGPU on Xen, challenges that he encountered while doing it, and discussing performance metrics of bare metal and vGPU VM on popular benchmarks like 3D Mark* and The Witcher 3. To wrap up his presentation, Jon will share his thoughts about future research and where this technology can take us.

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