mirror of
https://github.com/clearlinux/kvmtool.git
synced 2026-06-16 02:15:47 +00:00
Pekka Enberg
5fd5abef73
This reverts commit f0aec23a91368e916a53e6072f2173bb481b1544. Asias He writes: 'ip=dhcp' makes kernel try to use nfs as root fs which results in a long time 'wait and fail' and finally fallback to 9p as root fs. [ 1.688000] Sending DHCP requests ., OK [ 1.695000] IP-Config: Got DHCP answer from 192.168.33.1, my address is 192.168.33.15 [ 1.699000] IP-Config: Complete: [ 1.700000] device=eth0, addr=192.168.33.15, mask=255.255.255.0, gw=192.168.33.1, [ 1.703000] host=192.168.33.15, domain=stu.buaa.edu.cn, nis-domain=(none), [ 1.706000] bootserver=192.168.33.1, rootserver=192.168.33.1, rootpath= [ 36.769000] VFS: Unable to mount root fs via NFS, trying floppy. [ 36.771000] VFS: Mounted root (9p filesystem) on device 0:14.
110 lines
3.0 KiB
Plaintext
110 lines
3.0 KiB
Plaintext
Native Linux KVM tool
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=====================
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The goal of this tool is to provide a clean, from-scratch, lightweight
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KVM host tool implementation that can boot Linux guest images (just a
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hobby, won't be big and professional like QEMU) with no BIOS
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dependencies and with only the minimal amount of legacy device
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emulation.
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It's great as a learning tool if you want to get your feet wet in
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virtualization land: it's only 5 KLOC of clean C code that can already
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boot a guest Linux image.
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Right now it can boot a Linux image and provide you output via a serial
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console, over the host terminal, i.e. you can use it to boot a guest
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Linux image in a terminal or over ssh and log into the guest without
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much guest or host side setup work needed.
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1. To try out the tool, clone the git repository:
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git clone git://github.com/penberg/linux-kvm.git
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or alternatively, if you already have a kernel source tree:
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git remote add kvm-tool git://github.com/penberg/linux-kvm.git
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git remote update
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git checkout -b kvm-tool/master kvm-tool
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2. Compile the tool:
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cd tools/kvm && make
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3. Download a raw userspace image:
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wget http://wiki.qemu.org/download/linux-0.2.img.bz2 && bunzip2
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linux-0.2.img.bz2
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4. The guest kernel has to be built with the following configuration:
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- For the default console output:
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CONFIG_SERIAL_8250=y
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CONFIG_SERIAL_8250_CONSOLE=y
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- For running 32bit images on 64bit hosts:
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CONFIG_IA32_EMULATION=y
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- Proper FS options according to image FS (e.g. CONFIG_EXT2_FS, CONFIG_EXT4_FS).
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- For all virtio devices listed below:
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CONFIG_VIRTIO=y
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CONFIG_VIRTIO_RING=y
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CONFIG_VIRTIO_PCI=y
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- For virtio-blk devices (--disk, -d):
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CONFIG_VIRTIO_BLK=y
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- For virtio-net devices ([--network, -n] virtio):
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CONFIG_VIRTIO_NET=y
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- For virtio-9p devices (--virtio-9p):
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CONFIG_NET_9P=y
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CONFIG_NET_9P_VIRTIO=y
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CONFIG_9P_FS=y
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- For virtio-balloon device (--balloon):
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CONFIG_VIRTIO_BALLOON=y
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- For virtio-console device (--console virtio):
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CONFIG_VIRTIO_CONSOLE=y
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- For virtio-rng device (--rng):
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CONFIG_HW_RANDOM_VIRTIO=y
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5. And finally, launch the hypervisor:
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./kvm run --disk linux-0.2.img \
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--kernel ../../arch/x86/boot/bzImage \
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or
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sudo ./kvm run --disk linux-0.2.img \
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--kernel ../../arch/x86/boot/bzImage \
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--network virtio
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The tool has been written by Pekka Enberg, Cyrill Gorcunov, Asias He,
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Sasha Levin and Prasad Joshi. Special thanks to Avi Kivity for his help
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on KVM internals and Ingo Molnar for all-around support and encouragement!
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See the following thread for original discussion for motivation of this
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project:
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http://thread.gmane.org/gmane.linux.kernel/962051/focus=962620
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Build dependencies
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=====================
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For deb based systems:
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32-bit:
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sudo apt-get install build-essential
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64-bit:
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sudo apt-get install build-essential libc6-dev-i386
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For rpm based systems:
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32-bit:
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yum install glibc-devel
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64-bit:
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yum install glibc-devel glibc-devel.i386
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On 64-bit Arch Linux make sure the multilib repository is enabled in your
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/etc/pacman.conf and run
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pacman -Sy lib32-glibc
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