linux-kernel - Re: [RFCv2 0/9] UEFI emulator for kexec

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Message-Id: <D400OHF2ODNK.3JF7DJ87Q4BYI@kernel.org>
Date: Sat, 07 Sep 2024 14:31:42 +0300
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko@...nel.org>, "Philipp Rudo"
 <prudo@...hat.com>, "Ard Biesheuvel" <ardb@...nel.org>
Cc: "Pingfan Liu" <piliu@...hat.com>, "Jan Hendrik Farr" <kernel@...rr.cc>,
 "Lennart Poettering" <mzxreary@...inter.de>, "Eric Biederman"
 <ebiederm@...ssion.com>, "Baoquan He" <bhe@...hat.com>, "Dave Young"
 <dyoung@...hat.com>, "Mark Rutland" <mark.rutland@....com>, "Will Deacon"
 <will@...nel.org>, "Catalin Marinas" <catalin.marinas@....com>,
 <kexec@...ts.infradead.org>, <linux-efi@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv2 0/9] UEFI emulator for kexec

On Sat Sep 7, 2024 at 2:27 PM EEST, Jarkko Sakkinen wrote:
> On Fri Sep 6, 2024 at 1:54 PM EEST, Philipp Rudo wrote:
> > Let me throw an other wild idea in the ring. Instead of implementing
> > a EFI runtime we could also include a eBPF version of the stub into the
> > images. kexec could then extract the eBPF program and let it run just
> > like any other eBPF program with all the pros (and cons) that come with
> > it. That won't be as generic as the EFI runtime, e.g. you couldn't
> > simply kexec any OS installer. On the other hand it would make it
> > easier to port UKIs et al. to non-EFI systems. What do you think?
>
> BPF would have some guarantees that are favorable such as programs
> always end, even faulty ones. It always has implicit "ExitBootServices".
>
> Just a remark.

Some days ago I was thinking could some of the kernel functionality be
eBPF at least like in formal theory because most of it is amortized,
i.e. does a fixed chunk of work. Not going into that rabbit hole but
I really like this idea and could be good experimentation ground for
such innovation.

BR, Jarkko