linux-kernel - Re: [PATCH v2 0/2] x86/kexec: UKI Support

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Message-ID: <ZP+41JvEFjsnEG19@MiWiFi-R3L-srv>
Date:   Tue, 12 Sep 2023 09:03:16 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Jan Hendrik Farr <kernel@...rr.cc>
Cc:     linux-kernel@...r.kernel.org, kexec@...ts.infradead.org,
        x86@...nel.org, tglx@...utronix.de, dhowells@...hat.com,
        vgoyal@...hat.com, keyrings@...r.kernel.org,
        akpm@...ux-foundation.org, bhelgaas@...gle.com, bluca@...ian.org,
        lennart@...ttering.net, prudo@...hat.com
Subject: Re: [PATCH v2 0/2] x86/kexec: UKI Support

Add Philipp to CC as he is also investigating UKI

On 09/11/23 at 07:25am, Jan Hendrik Farr wrote:
> Hello,
> 
> this patch (v2) implements UKI support for kexec_file_load. It will require
> support in the kexec-tools userspace utility. For testing purposes the
> following can be used: https://github.com/Cydox/kexec-test/
> 
> Creating UKIs for testing can be done with ukify (included in systemd),
> sbctl, and mkinitcpio, etc.

This is awesome work, Jan, thanks.

By the way, could you provide detailed steps about how to test this
patchset so that people interested can give it a shot?

> 
> There has been discussion on this topic in an issue on GitHub that is linked
> below for reference.
> 
> Changes for v2:
> - .cmdline section is now optional
> - moving pefile_parse_binary is now in a separate commit for clarity
> - parse_pefile.c is now in /lib instead of arch/x86/kernel (not sure if
>   this is the best location, but it definetly shouldn't have been in an
>   architecture specific location)
> - parse_pefile.h is now in include/kernel instead of architecture
>   specific location
> - if initrd or cmdline is manually supplied EPERM is returned instead of
>   being silently ignored
> - formatting tweaks
> 
> 
> Some links:
> - Related discussion: https://github.com/systemd/systemd/issues/28538
> - Documentation of UKIs: https://uapi-group.org/specifications/specs/unified_kernel_image/
> 
> Jan Hendrik Farr (2):
>   move pefile_parse_binary to its own file
>   x86/kexec: UKI support
> 
>  arch/x86/include/asm/kexec-uki.h       |   7 ++
>  arch/x86/kernel/Makefile               |   1 +
>  arch/x86/kernel/kexec-uki.c            | 126 +++++++++++++++++++++++++
>  arch/x86/kernel/machine_kexec_64.c     |   2 +
>  crypto/asymmetric_keys/mscode_parser.c |   2 +-
>  crypto/asymmetric_keys/verify_pefile.c | 110 +++------------------
>  crypto/asymmetric_keys/verify_pefile.h |  16 ----
>  include/linux/parse_pefile.h           |  32 +++++++
>  lib/Makefile                           |   3 +
>  lib/parse_pefile.c                     | 109 +++++++++++++++++++++
>  10 files changed, 292 insertions(+), 116 deletions(-)
>  create mode 100644 arch/x86/include/asm/kexec-uki.h
>  create mode 100644 arch/x86/kernel/kexec-uki.c
>  create mode 100644 include/linux/parse_pefile.h
>  create mode 100644 lib/parse_pefile.c
> 
> -- 
> 2.40.1
>