linux-kernel - Re: [PATCH V9 20/24] LoongArch: Add efistub booting support

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Date:   Fri, 13 May 2022 21:32:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Huacai Chen <chenhuacai@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>, WANG Xuerui <kernel@...0n.name>,
        Ard Biesheuvel <ardb@...nel.org>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH V9 20/24] LoongArch: Add efistub booting support

On Fri, May 6, 2022 at 3:20 PM Huacai Chen <chenhuacai@...il.com> wrote:
> On Fri, May 6, 2022 at 7:41 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > Agreed. I think there can be limited compatibility support for old
> > firmware though, at least to help with the migration: As long as
> > the interface between grub and linux has a proper definition following
> > the normal UEFI standard, there can be both a modern grub
> > that is booted using the same protocol and a backwards-compatible
> > grub that can be booted from existing firmware and that is able
> > to boot the kernel.
> >
> > The compatibility version of grub can be retired after the firmware
> > itself is able to speak the normal boot protocol.
> After an internal discussion, we decide to use the generic stub, and
> we have a draft version of generic stub now[1]. I hope V10 can solve
> all problems. :)
> [1] https://github.com/loongson/linux/tree/loongarch-next-generic-stub

Can you post v19 to the list? As we have resolved the question on clone()
now (I hope), and you have a prototype for the boot protocol, it sounds
like this can make it into v5.19 after all, but we need to be sure that the
remaining points that Xuerui Wang and Ard Biesheuvel raised are
all addressed, and there is not much time before the merge window.

I have built a gcc-12.1 based toochain at
https://mirrors.edge.kernel.org/pub/tools/crosstool/ that now includes
loongarch64 suport, please point to that in the cover letter for v10
in case someone wants to start test building.

I will be travelling next week, and won't be able to pull your tree
into the asm-generic tree during that time, as I had originally planned.

However, you can ask Stephen Rothwell (added to Cc) to add your
git tree to linux-next once you think that you have addressed all of the
remaining review comments, and posted the same version to the
list. This will allow others to more easily test your tree in combination
with the other work that has been queued for the 5.19 release.

If there are no new show-stoppers, I can help you coordinate
the pull request during the merge window.

         Arnd