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→Use Cases: ARM
The qemu emulation environment lets you run a variety of software on your computer in a protected environment. This includes software that is incompatible with your operating system. See also [[VMWare]] and [[WINE]].
<noinclude>[[Category:Virtual machine or platform emulator]]</noinclude>
The [[wikipedia:QEMU|QEMU]] emulation environment, including the accelerators kqemu and kvm, lets you run a variety of software on your computer in a protected environment. This includes software that is incompatible with your operating system, and software for different processors. Other options are [[VirtualBox]] (Free Software) and [[VMware]], commercial software with a no-cost runtime version.
==Use Cases==
==Use Cases==
* [[Windows]]: Run [[Sugar]], [http://wiki.laptop.org/go/School_server School Server], Linux more generally (for example, as a method for shifting from Windows to Linux)
* [[Windows]]: Run [[Sugar]], [[olpc:School_server|School Server]], Linux more generally (for example, as a method for shifting from Windows to Linux)
* [[Macintosh]]: Run Sugar, School Server, any Linux
* [[Macintosh]]: Run Sugar, School Server, any Linux
* Linux on Linux: [[Fedora]] (including School Server) on [[Ubuntu]] and the like
* Linux on Linux: [[Fedora]] (including School Server) on [[Ubuntu]] and the like
* Sugar on Arm processors: Encore [[Mobilis]] and proposed [[olpc:XO-2|XO-2]]
* BSD: qemu in development
* BSD: qemu in development
You can run [[image files]] of almost any version of Sugar and the XS school server in qemu, including daily builds, releases, Sugar on a Stick, Live CDs, sugar-jhbuild, and whatever else we come up with. As we [[port Sugar]] to other computer architectures, such as [[ARM]], this will become increasingly important, so that developers and testers do not have to purchase one of each. There are emulation modules for qemu to emulate a wide range of processors and peripherals.
You can run [[Emulator image files]] of almost any version of Sugar and the XS school server in qemu, including daily builds, releases, Sugar on a Stick, Live CDs, sugar-jhbuild, and whatever else we come up with. As we [[port Sugar]] to other computer architectures, such as ARM[[https://wiki.sugarlabs.org/go/Fedora_32#Rpi]], this will become increasingly important, so that developers and testers do not have to purchase one of each. There are emulation modules for qemu to emulate a wide range of processors and peripherals.
==Getting Started==
==Getting Started==
You should install an accelerator if at all possible, that is, if your processor supports virtualization in hardware. To find out whether it does, run the command
You should install an accelerator if at all possible, that is, if your processor supports virtualization in hardware. To find out whether it does, run the command
$ egrep ‘(vmx|svm)’ /proc/cpuinfo
$ egrep '(vmx|svm)' /proc/cpuinfo
flags : fpu vme de pse tsc msr pae mce cx8 … vmx …
flags : fpu vme de pse tsc msr pae mce cx8 … vmx …
flags : fpu vme de pse tsc msr pae mce cx8 … vmx …
flags : fpu vme de pse tsc msr pae mce cx8 … vmx …
disk size: 6.8G<br>
disk size: 6.8G<br>
cluster_size: 4096
cluster_size: 4096
To convert a read-only CD image such as the [[Sugar on a Stick]] Beta to read-write qcow2,
$ qemu-img convert -O qcow2 soas-beta.iso soas-beta.img
===Minimum Command===
===Minimum Command===
===Command Line===
===Command Line===
This is actually a full terminal interface. It is good for remote servers, where you don't want to run X (too unstable) but you want to be able to log in with ssh to administer the system. This also lets you run full-screen text mode applications such as aptitude and Midnight Commander. Curses is named for the full-screen terminal cursor, which can be anywhere in a 24 × 80 field.
This is actually a full terminal interface. It is good for remote virtual servers, where you don't want to run X (too unstable) but you want to be able to log in with ssh to administer the system. This also lets you run full-screen text mode applications such as aptitude and Midnight Commander. Curses is named for the full-screen terminal cursor, which can be anywhere in a 24 × 80 field.
$ kvm -m 512 -curses -hda hda.img
$ kvm -m 512 -curses -hda hda.img
==qemu monitor==
The key combination Ctl-Alt-2 (not F2) transfers you from your running virtual machine to the qemu command line. This lets you query the system, save and load snapshots, and perform other administrative tasts. See the qemu documentation for available commands. Unfortunately the process of saving snapshots is not reliable. It may appear to work, but create a corrupted image.
==Resources==
==Resources==
[http://www.nongnu.org/qemu/ QEMU home page]
* [http://www.nongnu.org/qemu/ QEMU home page]
[http://virtualize-it.highspeed-data.net/index.php/tag/kqemu/ more on KVM]
* [http://virtualize-it.highspeed-data.net/index.php/tag/kqemu/ more on KVM]
* [[OLPC:QEMU]]