Re: [SeaBIOS] Regression with latest SeaBIOS booting multi-disk root LVs?

[Paul Menzel]

Dear Stefan,


Am 21.09.20 um 15:10 schrieb Stefan Reiter:

> since SeaBIOS 1.14.0 (QEMU 5.1) VMs with LVM root disks spanning more 
> than one PV fail to boot, if only the first is set as bootable. I 
> believe this is due to the changes in SeaBIOS only initializing drives 
> marked as 'bootable' by QEMU.
>
> One fix is to mark all disks containing root data as bootable, but 
> existing setups will still break on upgrade (where only the disk 
> containing the bootloader is marked). This is not ideal.
>
> Discovered by a user in our bugtracker:
> https://bugzilla.proxmox.com/show_bug.cgi?id=3011
>
> and verified by installing Ubuntu 20.04 w/ LVM and GRUB on virtio-scsi, 
> then expanding the LV to a second disk.
>
> I found that just reverting SeaBIOS to 1.13.0 makes it work again, same 
> guest install, even with QEMU 5.1.
>
> Is this intended behaviour? A bug in GRUB? Any fix or workaround?

As SeaBIOS 1.13.0 works and SeaBIOS 1.14.0 does not, please bisect the 
issue, and tell us the commit introducing the regression.


Kind regards,

Paul