Lguest

Lguest
Original author(s)	Rusty Russell
Operating system	Linux
Platform	Linux kernel
License	GNU General Public License
Website	lguest.ozlabs.org

Lguest is a Linux kernel x86 virtualization hypervisor introduced in kernel version 2.6.23 (released 9 October 2007) and removed in kernel version 4.14 (November 2017).^[1] The hypervisor is an operating-system-level virtualization system capable of running unmodified 32-bit x86 Linux kernels as guest machines. Installation is as easy as running modprobe lg followed by tools/lguest/lguest to create a new guest.^[2]

Lguest can still be installed on kernel 4.14 and later through out-of-tree patches.

Lguest was maintained by Rusty Russell.^[3]

References

^ Corbet, Jonathan (8 September 2017). "The first half of the 4.14 merge window". LWN.net.
^ Russell, Rusty (26 July 2007). "drivers/lguest/README".
^ Rusty Russell (15 October 2017). "Closing the curtain on lguest (and this mailing list!)".

External links

Official website
An introduction to lguest (LWN.net)

Linux kernel

Organization

Kernel	Linux Foundation Linux Mark Institute Linus's law Tanenbaum–Torvalds debate Tux SCO disputes Linaro GNU GPL v2 menuconfig Supported computer architectures Version history Criticism
Support	Developers The Linux Programming Interface kernel.org LKML Linux conferences Users Linux User Group (LUG)

Technical

Debugging

Startup

ABIs

APIs

Kernel

System Call Interface	POSIX ioctl select open read close sync … Linux-only futex epoll splice dnotify inotify readahead …
In-kernel	ALSA Crypto API io uring DRM kernfs Memory barrier New API RCU Video4Linux IIO

Userspace

Daemons, File systems	bpffs configfs devfs devpts debugfs FUSE hugetlbfs pipefs procfs securityfs sockfs sysfs tmpfs systemd udev Kmscon
Wrapper libraries	C standard library glibc uClibc Bionic libhybris dietlibc EGLIBC klibc musl Newlib libcgroup libdrm libalsa libevdev libusb liburing

Components

Process and I/O schedulers:
Brain Fuck Scheduler
Completely Fair Scheduler (CFS)
Earliest eligible virtual deadline first (EEVDF)
Noop scheduler
O(n) scheduler
O(1) scheduler
SCHED_DEADLINE
SCHED_FIFO
SCHED_RR

Variants

Mainline
- Linux kernel
- Linux-libre
High-performance computing
- INK
- Compute Node Linux
- SLURM
Real-time computing
- RTLinux
- RTAI
- Xenomai
- PREEMPT_RT
MMU-less
- μClinux
- PSXLinux

Virtualization	Hypervisor KVM Xen OS-level virtualization Linux-VServer Lguest LXC OpenVZ Other L4Linux ELinOS User-mode Linux MkLinux coLinux