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| | | {{Person |
| == Introduction == | | |Geoloc=51.1078852, 17.03853760000004 |
| | | |Location name=Wroclaw |
| KVM is a hardware-accelerated full-machine hypervisor and virtualization solution included as part of kernel 2.6.20 and later. It allows you to create and start hardware-accelerated virtual machines under Linux using the QEMU tools.
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| == Kernel Setup ==
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| To enable KVM, the following kernel config parameters should be enabled (this is based on a 3.x kernel):
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| Under <code>Processor type and features</code>, enable <code>Linux guest support</code>, and enable the following options:
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| {{kernelop|title=Processor type and features,Linux guest support|desc=
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| --- Linux guest support
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| [*] Enable paravirtualization code
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| [ ] paravirt-ops debugging (NEW)
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| [*] Paravirtualization layer for spinlocks
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| [ ] Xen guest support (NEW)
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| [*] KVM Guest support (including kvmclock) (NEW)
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| [ ] Enable debug information for KVM Guests in debugfs (NEW)
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| [ ] Paravirtual steal time accounting (NEW)
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| }} | | }} |
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| Under the <code>Virtualization</code> category from the main kernel config menu, enable <code>Kernel-based Virtual Machine (KVM) support</code>, and enable at least one type of KVM, either for Intel or AMD processors. It is also recommended to enable <code>Host kernel acceleration for virtio net</code>.
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| {{kernelop|title=Virtualization|desc=
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| --- Virtualization
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| <M> Kernel-based Virtual Machine (KVM) support
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| <M> KVM for Intel processors support
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| <M> KVM for AMD processors support
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| [*] KVM legacy PCI device assignment support
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| <M> Host kernel accelerator for virtio net
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| }}
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| You can use modules or build these parts directly into the kernel. Build your new kernel and modules, and reboot.
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| == User-space tools ==
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| If you are using QEMU on your desktop, add the following USE flag to <code>/etc/portage/make.conf</code>:
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| <pre>
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| USE="$USE usbredir"
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| </pre>
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| This will enable good mouse support for QEMU on your desktop.
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| Now, emerge qemu:
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| <console>
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| # ##i## emerge qemu
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| </console>
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| ==Initial Setup==
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| Prior to using KVM, modprobe the appropriate accelerated driver for Intel or AMD:
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| <console>
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| # ##i##modprobe kvm_intel
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| </console>
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| == Next Steps ==
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| {{important|Before using KVM, be sure that your user account is in the <code>kvm</code> group. You will need to use a command such as <code>vigr</code> or <code>gpasswd -a $USER kvm</code> as root to do this, and then log out and log back in for this to take effect.}}
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| {{important|Atm the group <code>kvm</code> has no access to /dev/kvm. Change this with
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| chown root:kvm /dev/kvm
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| chmod g+rw /dev/kvm
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| and kvm will start like expected [https://bugs.funtoo.org/browse/FL-1626 (see bug FL-1626)] }}
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| For information on how to use KVM with various operating systems, see:
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| * [[Windows 7 Virtualization with KVM]]
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| * [[Linux on KVM]]
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| [[Category:Virtualization]]
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| [[Category:KVM]]
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