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Cooperative LinuxCooperative Linux

³A treaty between two³A treaty between twoOS giants´OS giants´

By: Kislay



y Cooperative Linux, a port of the Linux kernel thatallows it to run as an unprivileged lightweight virtual machine in kernel mode, on top of anotherOS kernel.

y Uses the concept of Cooperative Virtual Machine(CVM)

y Contains special Windows drivers, which allow itto run under Windows XP as a guest operatingsystem with all privileges.



y Problem:Requirement of GCC for softwaredevelopment

y Solution:Install Linux OS on system

y New Problem:

Booting time extended, Unfamiliar withnew OSy Solution:

Cooperative Linux



y Dan Aloni originally started the development of Cooperative Linux based on similar work with User-mode Linux.

y He open sourced the software under the GNU GeneralPublic License.y Other developers have since contributed various

patches and additions to the software.



y Dev ice Dr i very T he device driver port of Cooperative Linux

is used for accessing kernel mode .y Interfaces with OS dependent primitives

Like page allocations, debug printing, andinterfacing with user space.

y Driver loads a kernel image from a vmlinuxfile.



y Cont ex t Switchi ngy T he Cooperative Linux VM uses only one

host OS process in order to provide a

context for itself and its processes, viz.colinux-daemon .y CoLinux is able to completely control the

CPU and MMU without affecting anything

else in the host OS kernel.y Uses an intermediate address space duringswitching



A ddress space transition during an OS cooperativekernel switch, using an intermapped page



y Int errup t Ha nd ling and Fo r wa rd ingCooperative Linux only forwards the invocations of interrupts to the host OS in order to keep functioning andsupport the coLinux-daemon process itself, regardless tothe fact that external hardware interrupts are meaninglessto the Cooperative Linux virtual machine.



y Version: 0.6.4y Released on date: J uly 02, 2006y Supported architectures:

y

Intel-compatible 386 and abovey Supported operating systems:y Windows 2000y Windows XPy Linux 2.6.x

y Supported guest Linux kernel versions:y 2.6.11



y Suspensiony User Mode Linux inside Cooperative Linuxy Live Cooperative Distributionsy Integration with ReactOS.y Virtual frame buffer support.y Support for more host operating systems such as

FreeBSD.



y Relatively effortless migration path from Windows.

y A dding Windows machines to Linux clusters.y Using Linux as a Windows firewall on the same

machine.y Linux kernel development, debugging, research

and study on another operating systems.



y

W eb refere n ces:y www. linux .comy www.h o wst uff work s.c omy www.c olinux .orgy www.d ilne tpc.c omy www.s our ceforge .ne t/p roje cts/c olinuxy www.h esp eria . gs f c.na sa . gov /c olinuxy www. u ser-mo d e-linux .s f .ne t



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