Re: [Xen-devel] Xen 4.3 development update, and stock-taking

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.01.13 at 18:11, George Dunlap <george.dunlap@xxxxxxxxxxxxx> wrote:
> To decide what "Xen has full support for EFI" means, we ought to compare 
> ourselves with anywhere Linux can boot.  So if there is some 
> functionality for Ubuntu when booting "EFI -> shim -> bootloader -> 
> Linux", then "full support" means having the same functionality when 
> booting "EFI -> shim -> bootloader -> Xen -> Linux".

Again, the bootloader portion here is a really questionable piece
under EFI, at least as long as the firmware provides a half way
user friendly representation of the EFI boot manager. An I can
only re-iterate that this - to me - i being proven by the fact that
Linux has enabled itself being booted without a boot manager
being involved.

> Not all of that functionality needs to be implemented -- we may decide 
> that "full support" isn't really worth our while (e.g. if it's a lot of 
> work just to make Ubuntu's splash screen function properly instead of 
> falling back to text mode).  But it needs to be a conscious decision 
> made for specific reasons, not because we just didn't think about it.

The splash screen is a particularly bad example - all needed setup
is done by xen.efi (as it wants to use the console itself), and all
needed information to make use of the framebuffer is being passed
to the kernel.

Jan


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