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explain kernel and virtualization mode setting

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Patrick Schleizer 2019-11-24 09:24:51 +00:00 committed by GitHub
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user/advanced-configuration/managing-vm-kernel.md
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@ -279,6 +279,7 @@ Booting to a kernel inside the template is not supported under `PVH`.
### Installing kernel in Debian VM
#### Distribution kernel
Apply the following instruction in a Debian TemplateVM or in a Debian StandaloneVM.
Using a distribution kernel package the initramfs and kernel modules should be handled automatically.
@ -302,25 +303,31 @@ sudo update-grub
~~~
You can safely ignore this error message:
~~~
grub2-probe: error: cannot find a GRUB drive for /dev/mapper/dmroot. Check your device.map
~~~
`grub2-probe: error: cannot find a GRUB drive for /dev/mapper/dmroot. Check your device.map`
You may want to adjust some settings in `/etc/default/grub` (or better `/etc/default/grub.d`). For example, lower `GRUB_TIMEOUT` to speed up VM startup. You need to re-run `sudo update-grub` after making grub confugration changes.
Then shutdown the VM.
Go to Qubes VM Manger -> right click on the VM -> Qube settings -> Advanced -> choose `pvgrub2-pvh` -> OK
Go to dom0 -> Qubes VM Manger -> right click on the VM -> Qube settings -> Advanced
Depends on `Virtualization` mode setting:
* `Virtualization` mode `PV`: Use of `Virtualization` mode `PV` mode is discouraged for security purposes.
* If you require `Virtualization` mode `PV` mode, install `grub2-xen` in dom0. This can be done by running command `sudo qubes-dom0-update grub2-xen` in dom0.
* `Virtualization` mode `PVH`: Booting to a kernel inside a TemplateVM is unsupported.
* `Virtualization` mode `HVM`: Possible.
The `Kernel` setting of the `Virtualization` mode setting:
* If `Virtualization` is set to `PVH` -> `Kernel` -> choose `pvgrub2-pvh` -> OK
* If `Virtualization` is set to `PV` -> `Kernel` -> choose `pvgrub2` -> OK
* If `Virtualization` is set to `HVM` -> `Kernel` -> choose `none` -> OK
Start the VM.
The process of using Qubes VM kernel with distribution kernel is complete.
**Note:** You may also use `PV` mode instead of `HVM` but this is not recommended for security purposes.
If you require `PV` mode, install `grub2-xen` in dom0 and change the template's kernel to `pvgrub2`.
Booting to a kernel inside the template is not supported under `PVH`.
#### Custom kernel
Any kernel can be installed. Just make sure to install kernel headers as well.