From bf822ef62f77c105fde41a75cc1b00c1b59de012 Mon Sep 17 00:00:00 2001 From: Peter Boy Date: Tue, 21 Mar 2023 10:41:40 +0100 Subject: [PATCH] Pulled partials into the text body. --- ...ization-in-virt-manager.adoc.2DELETE.adoc} | 0 ...d-virtualization-in-kvm.adoc.2DELETE.adoc} | 0 ...g-nested-virtualization.adoc.2DELETE.adoc} | 0 .../using-nested-virtualization-in-kvm.adoc | 108 ++++++++++++++++-- 4 files changed, 100 insertions(+), 8 deletions(-) rename modules/ROOT/pages/_partials/{proc_configuring-nested-virtualization-in-virt-manager.adoc => proc_configuring-nested-virtualization-in-virt-manager.adoc.2DELETE.adoc} (100%) rename modules/ROOT/pages/_partials/{proc_enabling-nested-virtualization-in-kvm.adoc => proc_enabling-nested-virtualization-in-kvm.adoc.2DELETE.adoc} (100%) rename modules/ROOT/pages/_partials/{proc_testing-nested-virtualization.adoc => proc_testing-nested-virtualization.adoc.2DELETE.adoc} (100%) diff --git a/modules/ROOT/pages/_partials/proc_configuring-nested-virtualization-in-virt-manager.adoc b/modules/ROOT/pages/_partials/proc_configuring-nested-virtualization-in-virt-manager.adoc.2DELETE.adoc similarity index 100% rename from modules/ROOT/pages/_partials/proc_configuring-nested-virtualization-in-virt-manager.adoc rename to modules/ROOT/pages/_partials/proc_configuring-nested-virtualization-in-virt-manager.adoc.2DELETE.adoc diff --git a/modules/ROOT/pages/_partials/proc_enabling-nested-virtualization-in-kvm.adoc b/modules/ROOT/pages/_partials/proc_enabling-nested-virtualization-in-kvm.adoc.2DELETE.adoc similarity index 100% rename from modules/ROOT/pages/_partials/proc_enabling-nested-virtualization-in-kvm.adoc rename to modules/ROOT/pages/_partials/proc_enabling-nested-virtualization-in-kvm.adoc.2DELETE.adoc diff --git a/modules/ROOT/pages/_partials/proc_testing-nested-virtualization.adoc b/modules/ROOT/pages/_partials/proc_testing-nested-virtualization.adoc.2DELETE.adoc similarity index 100% rename from modules/ROOT/pages/_partials/proc_testing-nested-virtualization.adoc rename to modules/ROOT/pages/_partials/proc_testing-nested-virtualization.adoc.2DELETE.adoc diff --git a/modules/ROOT/pages/using-nested-virtualization-in-kvm.adoc b/modules/ROOT/pages/using-nested-virtualization-in-kvm.adoc index 154e355..31b60c8 100644 --- a/modules/ROOT/pages/using-nested-virtualization-in-kvm.adoc +++ b/modules/ROOT/pages/using-nested-virtualization-in-kvm.adoc @@ -1,15 +1,108 @@ -ifdef::context[:parent-context: {context}] -:context: using-nested-virtiualization-in-kvm -[id='using-nested-virtiualization-in-kvm'] = How to enable nested virtualization in KVM Learn how to run a virtual machine within a virtual machine. -include::{partialsdir}/proc_enabling-nested-virtualization-in-kvm.adoc[leveloffset=+1] +// =========================================== +// include::{partialsdir}/proc_enabling-nested-virtualization-in-kvm.adoc[leveloffset=+1] +// =========================================== -include::{partialsdir}/proc_configuring-nested-virtualization-in-virt-manager.adoc[leveloffset=+1] +== Enabling nested virtualization in KVM -include::{partialsdir}/proc_testing-nested-virtualization.adoc[leveloffset=+1] +Nested virtualization allows you to run a virtual machine (VM) inside another VM while still using hardware acceleration from the host. + +=== Checking if nested virtualization is supported + +For Intel processors, check the `/sys/module/kvm_intel/parameters/nested` file. For AMD processors, check the `/sys/module/kvm_amd/parameters/nested` file. If you see `1` or `Y`, nested virtualization is supported; if you see `0` or `N`, nested virtualization is not supported. + +For example: + +---- +cat /sys/module/kvm_intel/parameters/nested +Y +---- + + +=== Enabling nested virtualization + +To enable nested virtualization for Intel processors: + +. Shut down all running VMs and unload the `kvm_probe` module: ++ +---- +sudo modprobe -r kvm_intel +---- +. Activate the nesting feature: ++ +---- +sudo modprobe kvm_intel nested=1 +---- ++ +. Nested virtualization is enabled until the host is rebooted. To enable it permanently, add the following line to the `/etc/modprobe.d/kvm.conf` file: ++ +---- +options kvm_intel nested=1 +---- + +To enable nested virtualization for AMD processors: + +. Shut down all running VMs and unload the `kvm_amd` module: ++ +---- +sudo modprobe -r kvm_amd +---- +. Activate the nesting feature: ++ +---- +sudo modprobe kvm_amd nested=1 +---- +. Nested virtualization is enabled until the host is rebooted. To enable it permanently, add the following line to the `/etc/modprobe.d/kvm.conf` file: ++ +---- +options kvm_amd nested=1 +---- + + +// =========================================== +// include::{partialsdir}/proc_configuring-nested-virtualization-in-virt-manager.adoc[leveloffset=+1] +// =========================================== +// [[proc_configuring-nested-virtualization-in-virt-manager]] +== Configuring nested virtualization in virt-manager + +Configure your VM to use nested virtualization: + +. Open virt-manager, double-click the VM in which you wish to enable nested virtualization, and click the *Show virtual hardware details* icon. + +. Click *CPUs* in the side menu. In the *Configuration* section, there are two options - either type `host-passthrough` in the *Model:* field, or select the *Copy host CPU configuration* check box (that fills the `host-model` value in the *Model* field). ++ +NOTE: Using host-passthrough is not recommended for general usage. It should only be used for nested virtualization purposes. ++ +. Click *Apply*. + + +// =========================================== +// include::{partialsdir}/proc_testing-nested-virtualization.adoc[leveloffset=+1] +// =========================================== +// [[proc_testing-nested-virtualization]] +== Testing nested virtualization + +. Start the virtual machine. +. On the virtual machine, run: ++ +---- +sudo dnf group install virtualization +---- ++ +. Verify that the virtual machine has virtualization correctly set up: ++ +---- +sudo virt-host-validate + QEMU: Checking for hardware virtualization : PASS + QEMU: Checking if device /dev/kvm exists : PASS + QEMU: Checking if device /dev/kvm is accessible : PASS + QEMU: Checking if device /dev/vhost-net exists : PASS + QEMU: Checking if device /dev/net/tun exists : PASS + ... +---- == Additional resources @@ -18,5 +111,4 @@ include::{partialsdir}/proc_testing-nested-virtualization.adoc[leveloffset=+1] * https://kashyapc.wordpress.com/2012/01/14/nested-virtualization-with-kvm-intel/ * https://kashyapc.wordpress.com/2012/01/18/nested-virtualization-with-kvm-and-amd/ -ifdef::parent-context[:context: {parent-context}] -ifndef::parent-context[:!context:] +