On Wed, Jul 01, 2020 at 12:01:08PM +0200, Vitaly Zaitsev via devel wrote:
> On 01.07.2020 11:28, Alexey A. wrote:
> > Stop using the L-word, please: BIOS is not "legacy", it's just
> > alternative way (one of many).
> Using BIOS boot on UEFI-compatible systems is a legacy, because it works
> under the CSM compatibly layer.
> More information about CSM you can find here:
> https://www.rodsbooks.com/efi-bootloaders/csm-good-bad-ugly.html

NB, with the OVMF UEFI firmware for KVM, there is *NO* CSM layer

IOW, If KVM is configured for UEFI, the guest OS must use UEFI boot;
if KVM is configured for legacy BIOS, the guest OS must use legacy BIOS.

Just something to be aware of if you're testing OS using KVM - it won't
replicate behaviour of bare metal UEFI setups with CSM.

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