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116 lines
3.7 KiB
Text
116 lines
3.7 KiB
Text
= How to enable nested virtualization in KVM
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'''
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[IMPORTANT]
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======
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This page was automatically converted from https://fedoraproject.org/wiki/How_to_enable_nested_virtualization_in_KVM
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It is probably
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* Badly formatted
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* Missing graphics and tables that do not covert well from mediawiki
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* Out-of-date
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* In need of other love
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Please fix it, remove this notice, and then add to `_topic_map.yml`
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Pull requests accepted at https://pagure.io/fedora-docs/fedora-howto
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Once that is live, go to the original wiki page and add an `{{old}}`
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tag, followed by a note like
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....
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{{admon/note|This page has a new home!|
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This wiki page is no longer maintained. Please find the up-to-date
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version at: https://docs.fedoraproject.org/whatever-the-url
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}}
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....
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======
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'''
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Nested virtualization allows you to run a virtual machine (VM) inside
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another VM while still using hardware acceleration from the host.
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[[nested-virt-support]]
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Nested virt support
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~~~~~~~~~~~~~~~~~~~
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Check if your system supports it:
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1. For Intel processors, look into
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`/sys/module/kvm_intel/parameters/nested`, for AMD processors into
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`/sys/module/kvm_amd/parameters/nested`. You should receive `1` or `Y`,
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if nested virt is supported, `0` or `N` otherwise. AMD processors should
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have it enabled by default, (certain) Intel processors might not.
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Example:
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+
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....
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$ cat /sys/module/kvm_intel/parameters/nested
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Y
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....
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2. If your host system does not have nested virt enabled (most probably
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just Intel case), try to enable it by booting with `kvm-intel.nested=1`
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argument on the kernel command line and check it again.
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If your system still doesn't advertise support for nested virt, your
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hardware might be too old, or your distribution version outdated. Try
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booting latest Fedora.
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[[configuration-in-virt-manager]]
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Configuration in virt-manager
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Configure your VM to use nested virt:
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1. Make sure your VM is shut down
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2. Open virt-manager, go to the VM details page for that VM.
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3. Click on the Processor page.
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4. In the Configuration section, there are two options - either type
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`host-passthrough` into to Model field or enable Copy host CPU
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configuration checkbox (that fills `host-model` value into the Model
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field). Click Apply.
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* The difference between those two values is complicated, some details
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are in https://bugzilla.redhat.com/show_bug.cgi?id=1055002[bug 1055002].
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For nested virt, you'll probably want to use host-passthrough until
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issues with host-model are worked out. Be aware though, that
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host-passthrough is not recommended for general usage, just for nested
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virt purposes.
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[[test-nested-virt]]
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Test nested virt
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~~~~~~~~~~~~~~~~
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1. Start the VM
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2. Inside the VM, run `sudo dnf group install virtualization`
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3. Verify that the guest has virt correctly setup with:
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`sudo virt-host-validate` . The check for hardware virtualization should
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pass:
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+
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....
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$ sudo virt-host-validate
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QEMU: Checking for hardware virtualization : PASS
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QEMU: Checking for device /dev/kvm : PASS
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QEMU: Checking for device /dev/vhost-net : PASS
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QEMU: Checking for device /dev/net/tun : PASS
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LXC: Checking for Linux >= 2.6.26 : PASS
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....
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[[see-also]]
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See Also
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~~~~~~~~
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* QA:Testcase_KVM_nested_virt[QA:Testcase KVM nested virt]
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* https://bugzilla.redhat.com/show_bug.cgi?id=1055002
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* http://kashyapc.wordpress.com/2012/01/14/nested-virtualization-with-kvm-intel/
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* https://kashyapc.wordpress.com/2012/01/18/nested-virtualization-with-kvm-and-amd/
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Category:Virtualization
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'''
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See a typo, something missing or out of date, or anything else which can be
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improved? Edit this document at https://pagure.io/fedora-docs/fedora-howto.
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