[pve-devel] [PATCH docs] add section about bios and uefi
f.gruenbichler at proxmox.com
Tue Sep 13 15:23:46 CEST 2016
On Tue, Sep 13, 2016 at 02:55:46PM +0200, Dominik Csapak wrote:
> this section explains what is the default and why,
> and explains when you need ovmf and why you need an efidisk
> also we explain how you can create an efidisk and that you
> have to set the resolution in the ovmf menu
> Signed-off-by: Dominik Csapak <d.csapak at proxmox.com>
> qm.adoc | 32 ++++++++++++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
> diff --git a/qm.adoc b/qm.adoc
> index 375cc39..24900b6 100644
> --- a/qm.adoc
> +++ b/qm.adoc
> @@ -368,6 +368,38 @@ if you use a SPICE client which supports it. If you add a SPICE USB port
> to your VM, you can passthrough a USB device from where your SPICE client is,
> directly to the VM (for example an input device or hardware dongle).
> +BIOS and UEFI
> +In order to properly emulate a computer, QEMU needs to use a firmware.
> +By default QEMU uses *SeaBIOS* for this, which is an open-source, x86 BIOS
> +implementation. Normally this is good and fine for most standard setups.
The last sentence is a bit redundant, maybe something like:
'SeaBIOS is sufficient for most standard setups.'
> +There are, however, some scenarios in which a BIOS is not a good firmware
> +too boot from, e.g. if you want to do VGA passthrough. footnote:[Alex Williamson has a very good blog entry about this.
> +In such cases, you should rather use *OVMF*, which is an open-source UEFI implemenation. footnote:[See the OVMF Project http://www.tianocore.org/ovmf/]
> +If you want to use OVMF, there are several things to consider:
> +In order to save things like the *boot order*, there needs to be an EFI Disk.
> +This disk will be included in backups and snapshots, and there can only be one.
> +You can create such a disk with the following command:
> + qm set <vmid> -efidisk0 <storage>:1,format=<format>
> +Where *<storage>* is the storage where you want to have the disk, and
> +*<format>* is a format which the storage supports. Alternatively, you can
> +create such a disk through the web interface with 'Add' -> 'EFI Disk' in the
> +hardware section of a VM.
> +When using OVMF with a virtual display (without VGA passthrough),
> +you need to set the client resolution in the OVMF menu(which you can reach
> +with a press of the ESC button during boot), or you have to choose
> +SPICE as the display type.
> Managing Virtual Machines with 'qm'
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