Re: [PATCH v2 1/3] arm64: Add Xen boot support file

[Ian Campbell <ian.campbell@citrix.com>]

On Wed, 2015-07-15 at 18:18 +0200, Vladimir 'φ-coder/phcoder' Serbinenko
wrote:
> On 13.07.2015 10:53, fu.wei@linaro.org wrote:
> > From: Fu Wei <fu.wei@linaro.org>
> > 
> > This patch adds Xen boot support file:
> > grub-core/loader/arm64/xen_boot.c
> > include/grub/arm64/xen_boot.h
> > 
> > This patch also adds commands register code and hearder file into
> > grub-core/loader/arm64/linux.c
> > 
> >   - This adds support for the Xen boot on ARM specification for arm64.
> >   - The implementation for Xen is following  <Multiboot on ARM Specification>:
> >       http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/Multiboot
> Please don't refer to this protocol as multiboot anywhere in grub or
> around because it's NOT multiboot and we don't want to confuse those 2
> protocols.

That's fair enough, my hope was that the docs and communal knowledge
about how to write a grub.cfg for Xen x86/multiboot could remain
unchanged for Xen on arm (e.g. by using the same multiboot1 command
names, which surely won't be reused on arm), but I can see why you would
object to that and updating 20_linux_xen to DTRT on both arches solves
the majority of that concern.

WRT to what to call it instead: I did try and design it[0] to not be Xen
specific, so it would be nice to avoid making it so in the command names
if possible. I suspect this may lead to a certain amount of
bikeshedding, if so we should just call it something Xen specific and
move on I think.

For a non-Xen specific name how about "fbm -- fdt boot module" protocol
and associated commands fbm_kernel + fbm_module?

Ian.

[0]
http://wiki.xen.org/wiki/Xen_ARM_with_Virtualization_Extensions/Multiboot