From: Jason Gunthorpe <jgg@nvidia.com>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: Pingfan Liu <piliu@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
Jeremy Linton <jeremy.linton@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Simon Horman <horms@kernel.org>,
Gerd Hoffmann <kraxel@redhat.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Philipp Rudo <prudo@redhat.com>, Viktor Malik <vmalik@redhat.com>,
Jan Hendrik Farr <kernel@jfarr.cc>, Baoquan He <bhe@redhat.com>,
Dave Young <dyoung@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
kexec@lists.infradead.org, bpf@vger.kernel.org,
systemd-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCHv7 00/13] kexec: Use BPF lskel to enable kexec to load PE format boot image
Date: Tue, 13 Oct 2026 21:02:27 -0300 [thread overview]
Message-ID: <20261014000227.GV13920@nvidia.com> (raw)
In-Reply-To: <722bd9d8-5620-498a-a6c2-d9a1f498e0b7@app.fastmail.com>
On Tue, Oct 13, 2026 at 09:19:28PM +0200, Ard Biesheuvel wrote:
> > Given those constraints entering the successor kernel through the
> > normal EFI entry point is highly desirable. This would allow x86 to
> > continue to provide the DRTM trampolines through an EFI mechanism and
> > means the Linux EFI stub always handles the launch with identical code
> > in all scenarios.
>
> With some help from my friend Claude, I've prepared a prototype that
> reuses my efiloader Rust crate to boot EFI stub images (bare Image,
> zboot, UKI) in the kernel: the EFI boot phase is invoked at kexec
> load time, and runs under the preceding kernel up until the point
> where ExitBootServices() is called. Then, the actual kexec call
> will return from ExitBootServices() after shutting down the first
> kernel.
Running it inside a kthread is such a novel idea, I would have never
thought to attempt that!
I've asked some folks here to take a look and try to test this with
real DRTM capable HW. It seems very promising that it will work to me,
and I surmize this is also close to boot a UKI?
Seems amazing! Thanks a lot for drafting it!
Jason
prev parent reply other threads:[~2026-10-14 0:03 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-22 1:43 [PATCHv7 00/13] kexec: Use BPF lskel to enable kexec to load PE format boot image Pingfan Liu
2026-03-22 1:43 ` [PATCHv7 01/13] bpf: Introduce kfuncs to parser buffer content Pingfan Liu
2026-03-22 2:14 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 02/13] kexec_file: Use bpf-prog to decompose image Pingfan Liu
2026-03-22 2:14 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 03/13] lib/decompress: Keep decompressor when CONFIG_KEEP_DECOMPRESSOR Pingfan Liu
2026-03-22 2:26 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 04/13] kexec_file: Implement decompress method for parser Pingfan Liu
2026-03-22 2:26 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 05/13] kexec_file: Implement copy " Pingfan Liu
2026-03-22 1:43 ` [PATCHv7 06/13] kexec_file: Chain the stages into a pipeline Pingfan Liu
2026-03-22 2:14 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 07/13] kexec_file: Introduce a bpf-prog lskel to run a format parser Pingfan Liu
2026-03-22 1:43 ` [PATCHv7 08/13] kexec_file: Factor out routine to find a symbol in ELF Pingfan Liu
2026-03-22 2:14 ` bot+bpf-ci
2026-03-23 7:07 ` kernel test robot
2026-03-23 10:19 ` kernel test robot
2026-03-22 1:43 ` [PATCHv7 09/13] kexec_file: Integrate bpf light skeleton to load image with bpf-prog Pingfan Liu
2026-03-22 2:14 ` bot+bpf-ci
2026-03-22 1:43 ` [PATCHv7 10/13] arm64/kexec: Select KEXEC_BPF to support UEFI-style kernel image Pingfan Liu
2026-03-22 1:44 ` [PATCHv7 11/13] tools/kexec: Introduce a bpf-prog to handle zboot image Pingfan Liu
2026-03-22 2:26 ` bot+bpf-ci
2026-03-22 1:44 ` [PATCHv7 12/13] tools/kexec: Introduce a bpf-prog to handle UKI image Pingfan Liu
2026-03-22 1:44 ` [PATCHv7 13/13] tools/kexec: Introduce a tool to build zboot envelop Pingfan Liu
2026-03-23 19:02 ` [PATCHv7 00/13] kexec: Use BPF lskel to enable kexec to load PE format boot image Andrew Morton
2026-03-24 7:09 ` Pingfan Liu
2026-10-11 20:13 ` Jason Gunthorpe
2026-10-13 19:19 ` Ard Biesheuvel
2026-10-14 0:02 ` Jason Gunthorpe [this message]
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