Virtualizaton: One Size Does Not Fit All. Nedeljko Miljevic Product Manager, Automotive Solutions MontaVista Software
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1 Virtualizaton: One Size Does Not Fit All Nedeljko Miljevic Product Manager, Automotive Solutions MontaVista Software
2 Agenda Linux and Automotive Challenges Solution: Virtualization Linux Containers Best Fit? 2010 MontaVista Software - Confidential 2
3 Linux and Automotive
4 Linux in Automotive A number of ECUs are deployed in a car Traditionally running RTOSes Linux has gained traction in the automotive industry Transforming the OS landscape SoCs offer increasing performance Modern multicore SoCs offer a lot of power More functionality can be implemented on a single SoC With growing computing power the demands are also growing Cars becoming more intelligent Consolidating functions On a multicore system 2012 MontaVista Software 4
5 Linux and Automotive (cont.) Linux deployment Instrument Clusters Telematics IVI Systems Driven by Availability of Linux on SoCs from silicone vendors Drivers for HW usually available from Day 1 Increased demand for connectivity Wireless connectivity (to cloud) Follows increasing bandwidth and lowering prices Consumer devices (local) Innovation rate in OSS Abundance of SW projects 2012 MontaVista Software 5
6 Challenges: A Linux Perspective
7 Challenge 1: Solving Different Lifecycle Cadences Example: Android Co-Existence - OEM driven cadence T1/OEM Custom Apps Android Apps Consumer Cadence ~monthly - Cadence of ~6-12 months GENIVI Compliant Stack Android Google Cadence ~6-9 months MV Linux Kernel HW - SoC year cadence - Multiple hardware - Low, medium and high end 2012 MontaVista Software
8 Challenge 2: Connected Car Downloaded Apps Trusted Services Cloud Untrusted Services Networking: Firewall Trusted Applications Automotive Stack Access Control Linux Kernel Untrusted Applications Sandbox 2012 MontaVista Software
9 Challenge 3: Interoperability Traditional Model Instrument Cluster MCU Infotainment MCU Bus MCU... MCU MCU 2012 MontaVista Software
10 Challenge 3: Interoperability (cont.) Multicore Model Muticore System Instrument Cluster Infotainment Control Functions SW Bus MCU Bus MCU 2012 MontaVista Software
11 Solution: Virtualization
12 Demands on Virtualization in Automotive Depend on Use Cases Use Cases: Automotive Domain shares the resources with guest domain (e.g. Driver seat) Automotive and guest domains run each on dedicated resources (e.g. Passenger seats vs driver seat) Tecnological Demands: Isolation and Security Different domains should not affect each others functioning Interoperability Domains need to communicate and interact with each other 2012 MontaVista Software 12
13 Use Case: Shared HW HW Automotive GENIVI Stack Arbitration Audio Graphics Input Network Android LSM Access Control Linux Kernel With Android Patches 2012 MontaVista Software 13
14 Use Case: Dedicated HW Automotive GENIVI Stack Android LSM Linux Kernel HW Audio Graphics Input Network HW Audio Graphics Input Less Issues 2012 MontaVista Software 14
15 Resource Control Audio Management Priorities, handling of interrupt sources Graphics Management What, when, where to display Inputs Input distribution and focus Networking Outside world CE Connectivity IPC Interoperability (when desired) 2012 MontaVista Software 15
16 Interconnectivity Tradeoffs Flexibility (different Oses) Full Virtualization Performance Penalty Paravirtualization OS Level Virtualization Isolation 2012 MontaVista Software 16
17 Full Virtualization Host OS runs unmodified instances of guest OS(es) Maximal Domain Isolation Heavyweight, needs to emulate the HW visible by guest OS completely Access to real HW resources controlled by the hosting OS Linux/OSS world: KVM, proprietary implementations Intercommunication usually only on networking level Specific Automotive Demands: Audio needs an audio management implementation in both domains, hosting and guest Graphics, Inputs, networking handled automagically CE Connectivity may need more thorough planning IPC: mainly using networking 2012 MontaVista Software 17
18 Paravirtualization Thin HW abstraction layer running various OSes (hypervisor) Good Domain Isolation Guest OSes need to be patched Repetitive work when changing the OS version May not be supported on all OSes Lightweight Runs a separate instance for every guest kernel in the system Specific Automotive Demands: Audio Management, Graphics, Inputs, Networking hypervisor may need to control some of the functionality, depends on use case IPC hypervisor specific means 2012 MontaVista Software 18
19 OS Level Virtualization Multiple OS instances running on same kernel Domain isolation not so good (shared kernel) But tunable! Single kernel Need to maintain just one kernel Reduced Memory Footprint compared to other solutions Multiple userlands or applications Very little performance impact Use standard kernel features (no patching) Specific Automotive Demands: Audio Management, Graphics, Inputs, Networking, IPC handled by the same kernel 2012 MontaVista Software 19
20 Linux Containers
21 What s different? One Tux to run them all 2012 MontaVista Software 21
22 What are Containers? Lightweight, OS level virtualization Strictly speaking, not really virtualization Means of isolating process groups from each other Standard Linux kernel functionality cgroups namespaces Configurable access to system resources Devices, CPU, memory usage specified at start time Configuration is persistent Can be a single application or a complete userland ANY userland that runs on top of the same kernel Guest root FS is a part of the host root FS 2012 MontaVista Software 22
23 lxc OSS project Project in active development Some cool features not implemented yet Checkpoint / resume Comes with a set of command line utilities lxc-create, lxc-destroy lxc-start/lxc-stop lxc-freeze/lxc-unfreeze lxc-console, lxc-attach MontaVista Software 23
24 Containers and system resources Through cgroups / cpusets Resource management CPU time CPU affinity Memory usage Through namespaces Resource isolation File system Networking IPC Through configuration Resource Isolation Devices and access (r/w) Mount points Can be exclusive 2012 MontaVista Software 24
25 Isolation Host system IPC Container 1 Container n Root FS /... = / /... = / /dev /dev /dev... /dev /dev PID = xy PID 1 IPC PID 1 IPC Linux kernel 2012 MontaVista Software 25
26 File System Container s / is in the hosts s directory tree Individual files or directories can be shared between containers and/or with host (e.g. /etc/hosts, /bin,...) All specified in configuration files Some interesting consequences on IPC mechanisms Named pipes, sockets will work 2012 MontaVista Software 26
27 Single Kernel All kernel services available to host and container Can be restricted through MAC So... Anything that can be mmap ed can be used to communicate data between containers and/or host... (zero-copy) Host system Container 1... Container n Host app /dev/ MontaVista Software 27
28 Distorted Perception of reality? Using mmap ed buffers? E.g. For video buffer? What if... There is a mmap capable device with an allocated buffer and mmap() implementation Seen as /dev/fb0 on guest platform? Seen as /dev/mydriver on host platofrm? Complicated? It s YOUR call - as much as YOU make it! Moral: Finding a right tradeoff between isolation and performance is not something that the outside factors can decide for you. Solutions can be combined too! 2012 MontaVista Software 28
29 Containers special case A special case of container can... be bound to a single core be exempted from scheduler have all but a small number of interrupts vectored off its core (if/when needed) Result: Performance close to bare metal container on steroids (BME) > 99 % of CPU time dedicated to the foreground task ~16 times the performance of the normal Linux system on same HW All Linux kernel services still available Can communicate with host or other containers as any ordinary container Standard Linux programming!! 2010 MontaVista Software - Confidential 29
30 Best fit?
31 The answer is Depends on what you want to achieve Want to process CAN? Use a dedicated MCU, some form of serial connection to the host system Use one of cores on a multicore chip? Host a non-linux based system? (para)virtualize Or process CAN in BME Host a Linux userland? (e.g. Android?) Sandbox a single application? Containers are a natural choice 2010 MontaVista Software - Confidential 31
32 Thank you!
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