From: Al Viro <viro@zeniv.linux.org.uk>
To: Vincent Mailhol <mailhol@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>, Davidlohr Bueso <dave@stgolabs.net>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
linux-kernel@vger.kernel.org, linux-block@vger.kernel.org,
linux-efi@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Richard Henderson <richard.henderson@linaro.org>,
Matt Turner <mattst88@gmail.com>,
Magnus Lindholm <linmag7@gmail.com>,
linux-alpha@vger.kernel.org, Vineet Gupta <vgupta@kernel.org>,
linux-snps-arc@lists.infradead.org,
Russell King <linux@armlinux.org.uk>,
linux-arm-kernel@lists.infradead.org,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Huacai Chen <chenhuacai@kernel.org>,
WANG Xuerui <kernel@xen0n.name>,
loongarch@lists.linux.dev,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
linux-mips@vger.kernel.org,
"James E.J. Bottomley" <James.Bottomley@hansenpartnership.com>,
Helge Deller <deller@gmx.de>,
linux-parisc@vger.kernel.org,
Madhavan Srinivasan <maddy@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
linuxppc-dev@lists.ozlabs.org, Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
linux-riscv@lists.infradead.org,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
linux-s390@vger.kernel.org, Thomas Gleixner <tglx@kernel.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, Jonathan Corbet <corbet@lwn.net>,
Shuah Khan <skhan@linuxfoundation.org>,
linux-doc@vger.kernel.org
Subject: Re: [PATCH 00/19] init: discoverable root partitions, a.k.a. an omittable "root=" cmdline option
Date: Mon, 15 Jun 2026 18:04:32 +0100 [thread overview]
Message-ID: <20260615170432.GW2636677@ZenIV> (raw)
In-Reply-To: <20260615-discoverable-root_partitions-v1-0-39c78fac42e2@kernel.org>
On Mon, Jun 15, 2026 at 06:08:56PM +0200, Vincent Mailhol wrote:
> Tested with GRUB, which implements the LoaderDevicePartUUID EFI variable
> in its bli module [3]. With this, I was able to boot a kernel with a
> completely empty cmdline and no initrd.
>
> [1] The Discoverable Partitions Specification (DPS)
> Link: https://uapi-group.org/specifications/specs/discoverable_partitions_specification/
>
> [2] systemd-gpt-auto-generator
> Link: https://www.freedesktop.org/software/systemd/man/latest/systemd-gpt-auto-generator.html
>
> [3] GRUB -- §16.2 bli
> Link: https://www.gnu.org/software/grub/manual/grub/html_node/bli_005fmodule.html
So what does that thing, tied to EFI as it is, have to do with architectures where
* firmware is rather unlike EFI
* firmware wouldn't know what to do with GPT
* GRUB is *not* ported to, let alone used
such as, say it, the very first one mentioned at your [1]?
Or is that conditional upon "if anyone wants to design replacement firmware
for those, and if they agree to follow our wishlist"?
prev parent reply other threads:[~2026-06-15 17:04 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-06-15 16:08 [PATCH 00/19] init: discoverable root partitions, a.k.a. an omittable "root=" cmdline option Vincent Mailhol
2026-06-15 16:08 ` [PATCH 01/19] init: add DPS root partition type UUID capability Vincent Mailhol
2026-06-15 16:08 ` [PATCH 02/19] alpha: define DPS root partition type UUID Vincent Mailhol
2026-06-15 16:08 ` [PATCH 03/19] arc: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 04/19] arm: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 05/19] arm64: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 06/19] loongarch: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 07/19] mips: define DPS root partition type UUIDs Vincent Mailhol
2026-06-15 16:09 ` [PATCH 08/19] parisc: define DPS root partition type UUID Vincent Mailhol
2026-06-15 16:09 ` [PATCH 09/19] powerpc: define DPS root partition type UUIDs Vincent Mailhol
2026-06-15 16:09 ` [PATCH 10/19] riscv: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 11/19] s390: " Vincent Mailhol
2026-06-15 16:09 ` [PATCH 12/19] x86: " Vincent Mailhol
2026-06-15 16:46 ` Dave Hansen
2026-06-15 18:05 ` Matthew Wilcox
2026-06-15 16:09 ` [PATCH 13/19] block: store GPT partition type UUID Vincent Mailhol
2026-06-15 16:09 ` [PATCH 14/19] block: add early_lookup_bdev_by_type_uuid() Vincent Mailhol
2026-06-15 16:09 ` [PATCH 15/19] block: store GPT attributes as a raw value Vincent Mailhol
2026-06-15 16:09 ` [PATCH 16/19] block: don't discover partition with DPS no-auto GPT attribute Vincent Mailhol
2026-06-15 16:09 ` [PATCH 17/19] init: factor out root device lookup into lookup_root_device() Vincent Mailhol
2026-06-15 16:09 ` [PATCH 18/19] init: discover root by DPS partition type UUID Vincent Mailhol
2026-06-15 16:09 ` [PATCH 19/19] docs: document discoverable root partitions Vincent Mailhol
2026-06-15 17:04 ` Al Viro [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260615170432.GW2636677@ZenIV \
--to=viro@zeniv.linux.org.uk \
--cc=James.Bottomley@hansenpartnership.com \
--cc=agordeev@linux.ibm.com \
--cc=aou@eecs.berkeley.edu \
--cc=axboe@kernel.dk \
--cc=bp@alien8.de \
--cc=brauner@kernel.org \
--cc=catalin.marinas@arm.com \
--cc=chenhuacai@kernel.org \
--cc=corbet@lwn.net \
--cc=dave.hansen@linux.intel.com \
--cc=dave@stgolabs.net \
--cc=deller@gmx.de \
--cc=gor@linux.ibm.com \
--cc=hca@linux.ibm.com \
--cc=jack@suse.cz \
--cc=kernel@xen0n.name \
--cc=linmag7@gmail.com \
--cc=linux-alpha@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-block@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-efi@vger.kernel.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mips@vger.kernel.org \
--cc=linux-parisc@vger.kernel.org \
--cc=linux-riscv@lists.infradead.org \
--cc=linux-s390@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=linux@armlinux.org.uk \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=loongarch@lists.linux.dev \
--cc=maddy@linux.ibm.com \
--cc=mailhol@kernel.org \
--cc=mattst88@gmail.com \
--cc=mingo@redhat.com \
--cc=mpe@ellerman.id.au \
--cc=palmer@dabbelt.com \
--cc=pjw@kernel.org \
--cc=richard.henderson@linaro.org \
--cc=skhan@linuxfoundation.org \
--cc=tglx@kernel.org \
--cc=tsbogend@alpha.franken.de \
--cc=vgupta@kernel.org \
--cc=will@kernel.org \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox