XPDS14: Removing the Xen Linux Upstream Delta of Various Linux Distros - Luis R. Rodriguez, SUSE
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Xen is being used in production by many folks, but are they really using the upstream code? If not what are they using? At least SUSE's supported delta for the Linux kernel consists of 116 patches totaling 353,770 lines of code. Debian has 43 patches for a delta of about 1693 lines of code. What is this delta and how do we shrink it? I will give an overview of the supported Linux kernel delta for Xen at SUSE and Debian with upstream but also layout a proposed roadmap of addressing the delta in collaboration with different teams in the Xen community.
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The document discusses a use-after-free vulnerability, CVE-2011-1751, that was found in the emulation of the PIIX4 southbridge chip in QEMU KVM. By hot unplugging the emulated ISA bridge, it was possible to exploit a use-after-free bug in the emulated RTC device and achieve arbitrary code execution on the host. The talk outlines an exploit, virtunoid.c, that leverages this bug to inject shellcode and achieve a root shell on the KVM host.
XPDS16: Xen Development Update
The talk is a status report for the latest release and development projects. It will cover the new features and important bug fixes (if any) in 4.7. It will also provide insight on what’s in the queue for the next major release. Retrospective on the release process will also be part of talk.
XPDS16: The OpenXT Project in 2016 - Christopher Clark, BAE Systems
The OpenXT Project is an Open Source community producing a Xen-based platform for client devices with a focus on providing strong security properties. The different primary use cases of this project versus server-based Xen systems have motivated notable technical differences and consequently OpenXT should be of interest to anyone seeking to understand the full set of capabilities on offer within the Xen ecosystem.
In this presentation, Christopher Clark will describe the technical architecture of OpenXT, its current status and development activity within the project and its engagement with the upstream OpenEmbedded and Xen projects. This will include an overview of OpenXT's differentiating features such as Measured Launch, Virtual TPMs, Linux-based stubdoms, a specialized input layer and a distinct PV USB stack for Windows and Linux.
XPDS14: Efficient Interdomain Transmission of Performance Data - John Else, C...
XPDS14: Efficient Interdomain Transmission of Performance Data - John Else, C...The Linux Foundation
As users demand greater scalability from Citrix XenServer, the transmission of performance data from guests via xenstore is increasingly becoming a bottleneck. Future use of service domains is likely to make this problem worse. A simple, efficient way of transmitting time-varying datasets between userspace components in different domains is required. This talk will propose a lock-free mechanism to allow interdomain reporting of performance data without relying on continuous xenstore usage, and describe how it fits into the XAPI toolstack.XPDS16: Xen Scalability Analysis - Weidong Han, Zhichao Huang & Wei Yang, Huawei
XPDS16: Xen Scalability Analysis - Weidong Han, Zhichao Huang & Wei Yang, HuaweiThe Linux Foundation
As CPU integrates more cores, server will have more and more cores. It requires hypervisor to have good scalability. This talk will introduce our analysis on many core scalability of Xen, and share some findings and lessons.
XPDS16: Xen Orchestra: building a Cloud on top of Xen - Olivier Lambert & Jul...
XPDS16: Xen Orchestra: building a Cloud on top of Xen - Olivier Lambert & Jul...The Linux Foundation
Since its inception, the Xen Orchestra project which uses AGPLv3, always had a philosophy to listen and engage the community. User feedback shaped our initial concept, which first targeted system administrators. Eventually, our users drove us to support cloud-scale deployments supporting up to 2000 VM's. Retaining simplicity in usage and installation, while evolving Xen Orchestra to cloud scale posed many challenges. This led us to build many new features such ACLs, self-service, live charts, config drive management, and more, forced us to constantly evolve our architecture. First we will show how user needs changed our architecture, and how we implemented challenging problems such as user permissions, ACLs, Containers in a virtualized infrastructure and self service. We will conclude with a short demo, what is next and a lessons learned.High Performance Linux Virtual Machine on Microsoft Azure: SR-IOV Networking ...
High Performance Linux Virtual Machine on Microsoft Azure: SR-IOV Networking ...LinuxCon ContainerCon CloudOpen China
Can we leverage the resource of public cloud for gaming, streaming, transcoding, machine learning and visualized CAD application on demand? Yes if it provides the capability and infrastructure to utilize GPUs. Can we get high performance networking in the cloud as what I have in the bare metal environment? Yes with SR-IOV. How to achieve them? In this presentation we describe Discrete Device Assignment (also known as PCI Pass-through) support for GPU and network adapter in Linux guest and SR-IOV architectures of Linux guest with near-native performance profile running on Hyper-V. We also will share how to integrate accelerated graphics and networking capabilities in Microsoft Azure infrastructure. Kvm performance optimization for ubuntu
This document discusses various techniques for optimizing KVM performance on Linux systems. It covers CPU and memory optimization through techniques like vCPU pinning, NUMA affinity, transparent huge pages, KSM, and virtio_balloon. For networking, it discusses vhost-net, interrupt handling using MSI/MSI-X, and NAPI. It also covers block device optimization through I/O scheduling, cache mode, and asynchronous I/O. The goal is to provide guidance on configuring these techniques for workloads running in KVM virtual machines.
The sexy world of Linux kernel pvops project
The document discusses paravirtualized operations (pv-ops) in the Linux kernel which allows it to detect if it is running under virtualization like Xen or KVM and use optimized operations. Pv-ops was successful and mainly involved bug fixes recently. Most Xen kernel development is in subsystems and amounts to over 50,000 lines of code added per release. Future work includes optimizations to blkback and netback drivers to improve I/O performance, as well as adding perf support and developing a hybrid PV/HVM domain 0 capability. The presenter takes questions at the end.
Xen Project CI for OpenStack Overview
An overview of the libvirt+xen OpenStack CI, explaining the various components, how they fit together and the specific customisations needed to test libvirt+xen under OpenStack.
XPDS16: Hypervisor-based Security: Vicarious Learning via Introspektioneerin...
This presentation is based on the technical hurdles we overcame when building a commercial product on the introspection capabilities of the Xen hypervisor. Mihai Dontu will relate the importance of the x86 emulator, the need for a more focused effort on its completeness and correctness, the problems encountered, and the solutions adopted. He will also approach the subject of performance, for which hypervisor features that were not meant to be in the hot path had to be punctually reworked to solve a key requirement for making a theoretical product a commercial reality.
What's hot (20)
XPDS14 - Towards Massive Server Consolidation - Filipe Manco, NEC
XPDS14 - Towards Massive Server Consolidation - Filipe Manco, NEC
XPDS13: VIRTUAL DISK INTEGRITY IN REAL TIME JP BLAKE, ASSURED INFORMATION SE...
XPDS13: VIRTUAL DISK INTEGRITY IN REAL TIME JP BLAKE, ASSURED INFORMATION SE...
ELC21: VM-to-VM Communication Mechanisms for Embedded
ELC21: VM-to-VM Communication Mechanisms for Embedded
QEMU Disk IO Which performs Better: Native or threads?
QEMU Disk IO Which performs Better: Native or threads?
Obstacles & Solutions for Livepatch Support on ARM64 Architecture
Obstacles & Solutions for Livepatch Support on ARM64 Architecture
XPDS16: The OpenXT Project in 2016 - Christopher Clark, BAE Systems
XPDS16: The OpenXT Project in 2016 - Christopher Clark, BAE Systems
XPDS14: Efficient Interdomain Transmission of Performance Data - John Else, C...
XPDS14: Efficient Interdomain Transmission of Performance Data - John Else, C...
XPDS16: Xen Scalability Analysis - Weidong Han, Zhichao Huang & Wei Yang, Huawei
XPDS16: Xen Scalability Analysis - Weidong Han, Zhichao Huang & Wei Yang, Huawei
XPDS16: Xen Orchestra: building a Cloud on top of Xen - Olivier Lambert & Jul...
XPDS16: Xen Orchestra: building a Cloud on top of Xen - Olivier Lambert & Jul...
High Performance Linux Virtual Machine on Microsoft Azure: SR-IOV Networking ...
High Performance Linux Virtual Machine on Microsoft Azure: SR-IOV Networking ...
XPDS16: Hypervisor-based Security: Vicarious Learning via Introspektioneerin...
XPDS16: Hypervisor-based Security: Vicarious Learning via Introspektioneerin...
Similar to XPDS14: Removing the Xen Linux Upstream Delta of Various Linux Distros - Luis R. Rodriguez, SUSE
LXC on Ganeti
This document discusses improvements made to LXC container support in Ganeti through a Google Summer of Code project. Key areas worked on included fixing existing LXC integration, adding unit tests, setting up quality assurance, and adding features like migration. The project was mentored by Hrvoje Ribicic. Future work may include two-level isolation of containers within VMs and live migration of LXC instances.
ELC-E Linux Awareness
This document discusses improving debugging of the Linux kernel using the open source debugger GDB. It begins with an overview of existing ways to debug the kernel using GDB, including via KGDB, Qemu, and JTAG probes like OpenOCD. It then discusses the concept of adding "Linux awareness" to GDB, which would allow it to better understand kernel concepts like threads and modules. Finally, it outlines three approaches to implementing this awareness: via a GDB scripting extension, in the GDB stub, or with a C extension to GDB. The overall goal is to make GDB a more full-featured and useful tool for kernel debugging.
Talk 160920 @ Cat System Workshop
The document discusses dynamically hacking the Linux kernel with containers. It begins by introducing the speaker and their research interests. It then discusses three ways to modify the kernel space: kernel modules, live patching, and kernel detouring. Kernel detouring allows hijacking system calls within containers for cross-OS compatibility. Challenges include insufficient isolation and limited development. The talk demonstrates a proof-of-concept of running FreeBSD binaries on Linux using kernel detouring and containers. It remapped Linux system calls to FreeBSD equivalents and provided a FreeBSD environment within a Linux container.
Docker and friends at Linux Days 2014 in Prague
Docker allows deploying applications easily across various environments by packaging them along with their dependencies into standardized units called containers. It provides isolation and security while allowing higher density and lower overhead than virtual machines. Core OS and Mesos both integrate with Docker to deploy containers on clusters of machines for scalability and high availability.
Rloader, alternative tech to achieve fast boot time for ARM Linux
There are many approaches to speed up boot time for embedded device. One of the interesting tech is based hibernation. Rloader is based on this kind of tech.
PGConf.ASIA 2019 Bali - PostgreSQL on K8S at Zalando - Alexander Kukushkin
PGConf.ASIA 2019 Bali - 10 September 2019
Speaker: Alexander Kukushkin
Room: ACID
Title: PostgreSQL on K8S at Zalando: Two+ Years in Production
[Podman Special Event] Kubernetes in Rootless Podman
- Kubernetes can run in rootless containers using techniques like Podman, Docker, and containerd which map the root user inside containers to a non-root user on the host for improved security.
- Popular ways to run rootless Kubernetes include kind, minikube wrapped in Podman containers, and Usernetes which supports real multi-node clusters across multiple hosts using networking like Flannel.
- Future work includes promoting the "KubeletInUserNamespace" feature flag and eliminating overhead of user-mode TCP/IP for containers to improve the rootless Kubernetes experience.
Xen in Linux (aka PVOPS update)
This document discusses the current state and roadmap for Xen virtualization support in the Linux kernel. It notes that initial domain (dom0) support is complete in Linux 3.0 and that future work will focus on enhancing existing functionality, fixing bugs, improving 3D graphics and ACPI support, and providing enterprise features like data integrity extensions. It encourages testing Xen with Linux 3.0 and reporting any issues found.
1 m+ qps on mysql galera cluster
This document describes migrating a database from a standalone MySQL configuration to a Galera cluster for high availability and redundancy. It outlines the existing infrastructure including web, mail, and database servers managed by Puppet. It then details removing the existing MySQL data and joining the nodes to the new Galera cluster. Configuration files are shown for Galera settings like the state snapshot transfer method and slave threads. System information is displayed for one of the Galera nodes including the large production database size and high query throughput. The GitHub link shows example Puppet code to check the Galera cluster status and return errors if not in the primary or connected states.
Kernel development
Mechanisms and tools of development and monitoring in Linux Kernel
A brief presentation about the tools and mechanisms about development for the Linux Kernel to help understanding of what is required.
Tools that create an execution profile or provide instrumentation through static or dynamic methods, the Linux Kernel code, will be presented.
Also discussed will be the GDB debugger and how through a remote virtual serial connection to a virtual machine it can be used to debug a live Kernel and Linux Kernel modules. Also demonstrated will be how a deeper understanding of the code can be attained by attaching the memory locations used by the Kernel module to the GDB session.
Lastly, some of the Kernel execution contexts, such as, interrupts, deferrable work, context, etc. are presented.
Building the World's Largest GPU
This is a presentation I presented at NVIDIA AI Conference in Korea. It's about building the largest GPU - DGX-2, the most powerful supercomputer in one node.
Azure Day Rome Reloaded 2019 - Deconstructing Kubernetes using AKS
This document provides an overview of Kubernetes and containers by beginning with an introduction to containers and their benefits over virtual machines. It then discusses microservices architectures and introduces key Kubernetes concepts like pods, deployments, and services. It explains the Kubernetes architecture by describing the main components like the master node, API server, etcd, workers and kubelet. Finally, it compares Kubernetes to the Azure Kubernetes Service.
Network stack personality in Android phone - netdev 2.2
An alternate approach to updating the Android network stack is to implement the stack in userspace using the Linux Kernel Library (LKL). This allows new network protocols and stacks to be added without replacing the host kernel. Measurements show the userspace LKL stack can achieve comparable performance to the native kernel over WiFi, and higher throughput over multipath TCP despite processing packets twice. However, results are often unstable and there are some limitations like asynchronous signal safety that require further work. Overall, using LKL provides a way to more easily distribute new network code without waiting for kernel upgrades.
App container rkt
This document discusses container technologies including App Container (appc) and rkt. It provides an overview of appc components like the image format, discovery, and executor. It then discusses rkt, an implementation of appc, describing its modular architecture with stages 0-2 and use of systemd and cgroups for isolation. It also touches on rkt security, networking, and integration with systemd and user namespaces.
FPC for the Masses - CoRIIN 2018
This document describes Xavier Mertens' approach to implementing a full packet capture (FPC) infrastructure using Docker containers and Moloch. Key components include Moloch capture sensors running in Docker containers to perform packet capture and transfer files to a central Moloch server, and a Moloch server container that indexes transferred PCAP files for analysis. This distributed approach allows capturing traffic from multiple locations and centralizing it for long-term retention and investigation in Moloch. The open source project is available on GitHub to allow others to test and deploy the FPC solution.
Let's trace Linux Lernel with KGDB @ COSCUP 2021
https://coscup.org/2021/en/session/39M73K
https://www.youtube.com/watch?v=L_Gyvdl_d_k
Engineers have plenty of debug tools for user space programs development, code tracing, debugging and analyzing. Except “printk”, do we have any other debug tools for Linux kernel development? The “KGDB” mentioned in Linux kernel document provides another possibility.
Will share how to experiment with the KGDB in a virtual machine. And, use GDB + OpenOCD + JTAG + Raspberry Pi in the real environment as the demo in this talk.
開發 user space 軟體時，工程師們有方便的 debug 工具進行查找、分析、除錯。但在 Linux kernel 的開發，除了 printk 外，還可以有哪些工具可以使用呢？從 Linux kernel document 可以看到 KGDB 相關的資訊，提供了在 kernel 除錯時的另一個可能性。
本次將分享，從建立最簡單環境的虛擬機機開始，到實際使用 GDB + OpenOCD + JTAG + Raspberry Pi 當作展示範例。
Pumping stationone20140628 real-timeprogrammingwithbeaglebonepr_us.pptx
The document discusses real-time programming with BeagleBone PRUs. It describes PRUs as 32-bit RISC processors optimized for real-time tasks like packet processing. PRUs operate independently from the operating system for low latency and are well-suited for tasks like driving motors, custom protocols, and software peripherals. Examples of PRU projects include 6502 memory slaves, DMX512, and WS28xx LED control. Tools for PRU programming include the TI C compiler, Forth, and GCC.
See what happened with real time kvm when building real time cloud pezhang@re...
See what happened with real time kvm when building real time cloud pezhang@re...LinuxCon ContainerCon CloudOpen China
Presentation delivered at LinuxCon China 2017
Real-Time is used for deadline-oriented applications and time-sensitive workloads. Real-Time KVM is the extension of KVM(Linux Kernel-based Virtual Machine) to allow the virtual machines(VM) to be a truly Real-Time operating system.Users sometimes need to run low-latency applications(such as audio/video streaming, highly interactive systems, etc) to meet their requirements in clouds. NFV is a new network concept which uses virtualization and software instead of dedicated network appliances. For some use cases of telecommunications, network latency must be within a certain range of values. Real-Time KVM can help NFV meet this requirements.
In this presentation, Pei Zhang will talk about:
(1)Real-Time KVM introduction
(2)Real-Time cloud building
(3)Real-Time KVM in NFV: VM with openvswitch, dpdk and qemu’s vhostuser
(4)Performance testing results show SFO15-202: Towards Multi-Threaded Tiny Code Generator (TCG) in QEMU
This document discusses moving QEMU's Tiny Code Generator (TCG) to a multi-threaded model to take advantage of multi-core systems. It describes the current single-threaded TCG process model and global state. Approaches considered for multi-threading include using threads/locks, processes/IPC, or rewriting TCG from scratch. Key challenges addressed are protecting code generation globals and implementing atomic memory operations and memory barriers in a multi-threaded context. Patches have been contributed to address these issues and enable multi-threaded TCG. Further work remains to fully enable it across all QEMU backends and architectures.
[OpenStack Day in Korea 2015] Track 1-6 - 갈라파고스의 이구아나, 인프라에 오픈소스를 올리다. 그래서 보이...
[OpenStack Day in Korea 2015] Track 1-6 - 갈라파고스의 이구아나, 인프라에 오픈소스를 올리다. 그래서 보이...OpenStack Korea Community
OpenStack Day in Korea 2015 - Track 1-6
갈라파고스의 이구아나, 인프라에 오픈소스를 올리다. 그래서 보이는 오픈 스택
장재민 - 본부장, 스마일 서브Similar to XPDS14: Removing the Xen Linux Upstream Delta of Various Linux Distros - Luis R. Rodriguez, SUSE (20)
Rloader, alternative tech to achieve fast boot time for ARM Linux
Rloader, alternative tech to achieve fast boot time for ARM Linux
PGConf.ASIA 2019 Bali - PostgreSQL on K8S at Zalando - Alexander Kukushkin
PGConf.ASIA 2019 Bali - PostgreSQL on K8S at Zalando - Alexander Kukushkin
[Podman Special Event] Kubernetes in Rootless Podman
[Podman Special Event] Kubernetes in Rootless Podman
Azure Day Rome Reloaded 2019 - Deconstructing Kubernetes using AKS
Azure Day Rome Reloaded 2019 - Deconstructing Kubernetes using AKS
Network stack personality in Android phone - netdev 2.2
Network stack personality in Android phone - netdev 2.2
Pumping stationone20140628 real-timeprogrammingwithbeaglebonepr_us.pptx
Pumping stationone20140628 real-timeprogrammingwithbeaglebonepr_us.pptx
See what happened with real time kvm when building real time cloud pezhang@re...
See what happened with real time kvm when building real time cloud pezhang@re...
SFO15-202: Towards Multi-Threaded Tiny Code Generator (TCG) in QEMU
SFO15-202: Towards Multi-Threaded Tiny Code Generator (TCG) in QEMU
[OpenStack Day in Korea 2015] Track 1-6 - 갈라파고스의 이구아나, 인프라에 오픈소스를 올리다. 그래서 보이...
[OpenStack Day in Korea 2015] Track 1-6 - 갈라파고스의 이구아나, 인프라에 오픈소스를 올리다. 그래서 보이...
More from The Linux Foundation
ELC2019: Static Partitioning Made Simple
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.
XPDDS19: How TrenchBoot is Enabling Measured Launch for Open-Source Platform ...
XPDDS19: How TrenchBoot is Enabling Measured Launch for Open-Source Platform ...The Linux Foundation
Daniel Smith discusses TrenchBoot, a project aiming to establish a unified approach to harnessing boot integrity technologies across open source platforms. TrenchBoot will enable establishing hardware-rooted integrity during platform boot (first launch inspection), runtime (runtime inspection), and other states. For runtime inspection, TrenchBoot will develop a way to securely re-establish the integrity of Xen at any time without rebooting by dynamically launching an integrity kernel to inspect and verify Xen. The talk outlines the initial and future work of TrenchBoot to integrate these capabilities with Linux, Xen and other open source projects.XPDDS19 Keynote: Xen in Automotive - Artem Mygaiev, Director, Technology Solu...
XPDDS19 Keynote: Xen in Automotive - Artem Mygaiev, Director, Technology Solu...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.XPDDS19 Keynote: Xen Project Weather Report 2019 - Lars Kurth, Director of Op...
XPDDS19 Keynote: Xen Project Weather Report 2019 - Lars Kurth, Director of Op...The Linux Foundation
In this keynote talk, we will give an overview of the state of the Xen Project, trends that impact the project, see whether challenges that surfaced last year have been addressed and how we did it, and highlight new challenges and solutions for the coming year.XPDDS19 Keynote: Unikraft Weather Report
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.
XPDDS19 Keynote: Secret-free Hypervisor: Now and Future - Wei Liu, Software E...
XPDDS19 Keynote: Secret-free Hypervisor: Now and Future - Wei Liu, Software E...The Linux Foundation
The idea of making Xen secret-free has been floating since Spectre and Meltdown came into light. In this talk we will discuss what is being done and what needs to be done next.XPDDS19 Keynote: Xen Dom0-less - Stefano Stabellini, Principal Engineer, Xilinx
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: Patch Review for Non-maintainers - George Dunlap, Citrix Sys...
XPDDS19 Keynote: Patch Review for Non-maintainers - George Dunlap, Citrix Sys...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: Memories of a VM Funk - Mihai Donțu, Bitdefender
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.
OSSJP/ALS19: The Road to Safety Certification: Overcoming Community Challeng...
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.
OSSJP/ALS19: The Road to Safety Certification: How the Xen Project is Making...
This document summarizes a discussion around enabling functional safety certification for the Xen open source hypervisor project. Key points discussed include:
- Establishing a split development model with open and closed parts to balance community needs and safety requirements.
- Developing reference implementations and stacks supported by multiple vendors to demonstrate safety certification feasibility.
- Creating plans and processes around requirements, documentation, verification testing, and tooling integration to begin filling gaps for certification.
- Addressing challenges around funding, resources, expertise, and maintaining contributions to ensure any initial work is sustainable long-term.
- Taking an iterative, agile approach to make early progress while further securing necessary funding and support from interested parties.
XPDDS19: Speculative Sidechannels and Mitigations - Andrew Cooper, Citrix
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.
XPDDS19: Keeping Coherency on Arm: Reborn - Julien Grall, Arm ltd
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: QEMU PV Backend 'qdevification'... What Does it Mean? - Paul Durrant...
XPDDS19: QEMU PV Backend 'qdevification'... What Does it Mean? - Paul Durrant...The Linux Foundation
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.XPDDS19: Status of PCI Emulation in Xen - Roger Pau Monné, Citrix Systems R&D
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.
XPDDS19: [ARM] OP-TEE Mediator in Xen - Volodymyr Babchuk, EPAM Systems
Volodymyr will speak about TEE mediators. This is a new feature in Xen which allows multiple virtual machines to interact with Trusted Execution Environment available on platform. He developed mediator for one of TEEs, namely OP-TEE.
He will give background information on why TEE is needed at all and share some implementation details.
XPDDS19: Bringing Xen to the Masses: The Story of Building a Community-driven...
XPDDS19: Bringing Xen to the Masses: The Story of Building a Community-driven...The Linux Foundation
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.XPDDS19: Will Robots Automate Your Job Away? Streamlining Xen Project Contrib...
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