UML Status Report . Richard Weinberger sigma star gmbh . . . . - PowerPoint PPT Presentation

Overview Build and use UML Internals Limitations Ongoing work . UML Status Report . Richard Weinberger sigma star gmbh . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Table of contents . . 1 Overview . . 2 Build and use UML . . 3 Internals . . 4 Limitations . 5 Ongoing work . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . History . Initial name Linux on Linux (LoL) User Mode Linux (UML) One of the very first virtualization technologies for Linux Linux is very portable UML is a port of Linux to its own userspace ABI . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . History . Created by Jeff Dike Existed for a long time as out-of-tree patch Went mainline around 2.5 . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . What is it? . Basically a systemcall emulator qemu vs. uml vs. qemu-kvm Can run as non-root! . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Usecase . KVM needs a rather new computer qemu (without KVM) is very slow LXC a very young technology UML fills this gap . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Building . make defconfig ARCH=um SUBARCH=i386 make defconfig ARCH=um SUBARCH=x86 64 Don’t forget ARCH=um ! . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Running . ./linux –help ./linux rootfstype=hostfs init=/bin/sh ./linux ubda=Debian-XY.img mem=512M . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Basics for a Linux port . Interrupts Timer Traps Memory . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Interrupts . Signals SIGIO . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Timer tick in UML . setitimer SIGVTALRM Even supports NOHZ :) . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Traps . PTRACE SYSCALL PTRACE SYSEMU . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Memory . Main memory is a mapped file Page faults via SIGSEGV . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . UML modes . TT SKAS3 SKAS4 SKAS0 . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . SKAS0 . Every process within UML has a brother on the host side UML controls processes on host side via stub pages SIGSEGV for page faults . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Limitations . x86 only On x86 64 no ia32 No SMP Slow . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Ongoing work . ftrace support SMP epoll Interrupt chip . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Volunteers wanted . Test UML, run recent kernels Help implementing new features Shape up existing code Who can create us a fancy webseite? (seriously) http://user-mode-linux.sourceforge.net/ . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . Ideas . Better user mode networking using slirp (easy) Framebuffer using X11 (easy) kASLR (moderate) CONFIG VT (moderate) PCI support using VFIO (hard) ARM port (hard) . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report

Overview Build and use UML Internals Limitations Ongoing work . FIN . Questions? . . . . . . . . . . . . . . . . . . . . .. . .. . .. . .. . .. . .. . .. . .. . . .. . .. .. . .. . .. . .. . .. . .. . .. . .. . .. . .. . Richard Weinberger sigma star gmbh UML Status Report