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qm: bios/efi: explain what they even do, roughly

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Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
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Thomas Lamprecht 2019-04-06 13:57:00 +02:00
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@ -699,8 +699,12 @@ 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. SeaBIOS is a good choice for most standard setups.
Which, on common PCs often known as BIOS or (U)EFI, is executed as one of the
first steps when booting a VM. It is responsible for doing basic hardware
initialization and for providing an interface to the firmware and hardware for
the operating system. By default QEMU uses *SeaBIOS* for this, which is an
open-source, x86 BIOS implementation. SeaBIOS is a good choice for most
standard setups.
There are, however, some scenarios in which a BIOS is not a good firmware
to boot from, e.g. if you want to do VGA passthrough. footnote:[Alex Williamson has a very good blog entry about this.