XPDDS17: Xen Test Lab: The Installation and Our Plans - Ian Jackson, Citrix

A lot of the cloud discussion centers around which hypervisors are the best, and which management tools will simplify one's life the most. But is it the whole story? While addressing the problems from the lower and higher layers, the middle man -- the guest operating system -- is usually left behind. This talk will introduce OSv — a new from-scratch operating system written by a group of former Linux veterans designed specifically for cloud deployments. We will showcase the operating system architecture and explain the performance and manageability improvements that can be expected

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Audience Level Beginner Synopsis Layer 2 versus Layer 3, MLAG, Spanning-Tree, switch mechanism drivers, overlays and routing-on-the-host — What scales and what does not? The underlying plumbing of an OpenStack network is something you’d rather not have to think about. This presentation examines the network architectures of web-scale and large enterprise OpenStack users and how those same efficiencies can be used in deployments of all sizes. Speaker Bio: Scott is a Member of Technical Staff at Cumulus Networks where he designs, supports and deploys web-scale technologies and architectures in enterprise networks globally. Prior to becoming a founding member of the Cumulus office in Australia, Scott started his career as a network administrator before joining Cisco Systems to support their data centre products. OpenStack Australia Day Melbourne 2017 https://events.aptira.com/openstack-australia-day-melbourne-2017/

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OpenStack Networks the Web-Scale Way - Scott Laffer, Cumulus Networks

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Enterprise data centers have to support a diverse of set of workloads: cloud native, big data, high performance computing, and legacy applications. While cloud native applications are ideal to run in Docker clusters, bare metal and virtualization infrastructures must still be supported in the data center. The result is a proliferation of clusters and technologies running in individual silos, resulting in high management costs and low utilization. This talk describes the challenges and experiences in implementing a shared cluster infrastructure based on Kubernetes to support big data, high performance computing, and VM-based workloads. The talk will show the deployment and scaling of a high performance computing workload manager, Spark, and OpenStack, and how the VM and Docker management can be integrated together.

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How does Ceph perform when used in high-performance computing? This talk will cover a year of running Ceph on a (small) Cray supercomputer. I will describe how Ceph was configured to perform in an all-NVME configuration, and the process of analysis and optimisation of the configuration. I'll also give details on the efforts underway to adapt Ceph's messaging to run over high performance network fabrics, and how this work could become the next frontier in the battle against storage performance bottlenecks.

CEPH DAY BERLIN - CEPH ON THE BRAIN!

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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.

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ELC2019: Static Partitioning Made Simple

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.

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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 in Automotive - Artem Mygaiev, Director, Technology Solu...

XPDDS19 Keynote: Xen Project Weather Report 2019 - Lars Kurth, Director of Op...

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

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.

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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

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.

XPDDS19: Speculative Sidechannels and Mitigations - Andrew Cooper, Citrix

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

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.

XPDDS19: Status of PCI Emulation in Xen - Roger Pau Monné, Citrix Systems R&D

XPDDS19: [ARM] OP-TEE Mediator in Xen - Volodymyr Babchuk, EPAM Systems

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.

XPDDS19: Core Scheduling in Xen - Jürgen Groß, SUSE