Différences

Ci-dessous, les différences entre deux révisions de la page.

--- tech:notes_nested_virtualization [2025/05/15 12:06] – Jean-Baptiste
+++ tech:notes_nested_virtualization [2025/05/15 12:10] (Version actuelle) – Jean-Baptiste
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Virt}}
+# Notes nested virtualization
+## prereq
+Source : https://gist.github.com/plembo/782e1511e463221b5772e85b6f2f72d4#file-nestedvirtkvm-md
+. Make sure that the Intel-VT-x/AMD-V extensions are enabled in the host machine's BIOS.
+For Intel:
+~~~bash
+grep vmx /proc/cpuinfo
+~~~
+For AMD:
+~~~bash
+grep svm /proc/cpuinfo
+~~~
+. Check to see if /etc/modprobe.d/qemu-system-x86.conf exists and if it does not have the following line, add it
+and reboot:
+~~~bash
+options kvm_intel nested=1
+~~~
+. Go into the graphical virt-manager, open the subject guest's config, and click on "CPUs".
+. Check the box "Copy host CPU configuration" and Apply.
+. Restart the virtual machine, open a terminal in it and check for the extensions:
+~~~bash
+grep vmx /proc/cpuinfo
+~~~
+-----------------
+Source : https://docs.fedoraproject.org/en-US/quick-docs/using-nested-virtualization-in-kvm/
+Checking if nested virtualization is supported
+~~~
+cat /sys/module/kvm_intel/parameters/nested
+Y
+~~~
+## To enable nested virtualization for Intel processors:
+Shut down all running VMs and unload the kvm_probe module:
+~~~bash
+sudo modprobe -r kvm_intel
+~~~
+Activate the nesting feature:
+~~~bash
+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:
+~~~bash
+options kvm_intel nested=1
+~~~
+## To enable nested virtualization for AMD processors:
+Shut down all running VMs and unload the kvm_amd module:
+~~~bash
+sudo modprobe -r kvm_amd
+~~~
+Activate the nesting feature:
+~~~bash
+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:
+~~~bash
+options kvm_amd nested=1
+~~~
+## Testing nested virtualization
+~~~bash
+virt-host-validate
+~~~