Re: [Xen-devel] [PATCH v2 0/3] arm64: Add multiboot support (via fdt) for Xen boot

[Vladimir 'Ï-coder/phcoder' Serbinenko <phcoder@xxxxxxxxx>]

On 13.07.2015 10:53, fu.wei@xxxxxxxxxx wrote:
> From: Fu Wei <fu.wei@xxxxxxxxxx>
> 
>   - 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
>     and xen/docs/misc/arm/device-tree/booting.txt in Xen source code.
> 
>   - The multiboot/module commands have existed, so we use 
>     xen_hypervisor/xen_module instead.
> 
>   - This Xen boot support is built into linux module for aarch64,
>     and can not be used alone.
> 
>   - Adding this functionality to the existing "linux" module is for
>     reusing the existing code of devicetree.
> 
This is a misguided decision. Modules can depend on other modules.
Ideally shared functionality should be in a separate module but having
xen depend on linux is an OK stopgap solution. Putting everything in one
module is bad.
>   - Add the support of xen_hypervisor/xen_module commands in 
> util/grub.d/20_linux_xen.in
> 
>   - Add the introduction of xen_hypervisor/xen_module commands in 
> docs/grub.texi
> 
>   - The example of this support is <How to boot Xen with GRUB on AArch64 the 
> Foundation FVP model>
>     
> https://wiki.linaro.org/LEG/Engineering/Grub2/Xen_booting_on_Foundation_FVP_model_by_GRUB
> 
> Changelog:
> v2: remove the patches which have been accepted.
>     according to Vladimir's suggestion, change the command manes
>     and relevant code:
>         multiboot-->xen_hypervisor
>         module-->xen_module
>     improve the option parsing support for xen_hypervisor/xen_module commands.
>     add a patch for adding xen_hypervisor/xen_module support
>     in util/grub.d/20_linux_xen.in.
>     update docs/grub.texi patch for the new command names.
> 
> v1: The first version upstream patchset to grub-devel mailing list
> 
> 
> Fu Wei (3):
>   arm64: Add Xen boot support file
>   * util/grub.d/20_linux_xen.in: Add support of the XEN boot on aarch64
>   arm64: Add the introduction of xen_hypervisor/xen_module command in
>     docs/grub.texi
> 
>  docs/grub.texi                    |  27 ++
>  grub-core/Makefile.core.def       |   1 +
>  grub-core/loader/arm64/linux.c    |   6 +
>  grub-core/loader/arm64/xen_boot.c | 615 
> ++++++++++++++++++++++++++++++++++++++
>  include/grub/arm64/xen_boot.h     | 115 +++++++
>  util/grub.d/20_linux_xen.in       |  14 +-
>  6 files changed, 775 insertions(+), 3 deletions(-)
>  create mode 100644 grub-core/loader/arm64/xen_boot.c
>  create mode 100644 include/grub/arm64/xen_boot.h
>

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