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Re: [Xen-users] Xen guest's bios=ovmf EFI vars are not persistent across guest reboot ?


On Wed, Feb 24, 2016 at 05:40:32PM -0800, suse.dev@xxxxxx wrote:
> I notice that when booting to a Xen UEFI Guest, where its config contains
>       bios='ovmf'
> that the boot sequence queries for "Floppy" first.  Clearly, there's no 
> floppy involved here.

EFI in xen uses a file on the ESP to store the EFI variables.  Since it can't 
share access to the ESP when the 
operating system is running changes made outside of the firmware shell are not 
persisted.  If you start the EFI 
shell from the boot menu and modify the boot order there it should persist the 

qemu has a pflash option which allows the location of an external backing file 
to be used but this is not wired 
up in to Xen.


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