linux-kernel - Re: [PATCH v4 0/1] riscv: Allow to downgrade paging mode from the command line

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Date:   Fri, 17 Feb 2023 15:48:00 +0100
From:   Björn Töpel <bjorn@...nel.org>
To:     Alexandre Ghiti <alexghiti@...osinc.com>,
        Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Conor Dooley <conor@...nel.org>,
        Ard Biesheuvel <ardb@...nel.org>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH v4 0/1] riscv: Allow to downgrade paging mode from the
 command line

Alexandre Ghiti <alexghiti@...osinc.com> writes:

> This new version gets rid of the limitation that prevented KASAN kernels
> to use the newly introduced parameters.
>
> While looking into KASLR, I fell onto commit aacd149b6238 ("arm64: head:
> avoid relocating the kernel twice for KASLR"): it allows to use the fdt
> functions very early in the boot process with KASAN enabled by simply
> compiling a new version of those functions without instrumentation.
>
> I had to change the handling of the command line parsing to make the
> code self-contained in kernel/pi/cmd_early.c to avoid calling too many
> __pi prefixed functions from outside this file.
>
> I'll use this approach like arm64 to handle the extraction of the random
> seedi from the device tree for KASLR.
>
> @Ard: I copied the "pi" name but I have to admit I don't know what it
> means.

__pi_ is for "position-independent" -- KASLR related.

For the (tiny ;-)) series:

Tested-by: Björn Töpel <bjorn@...osinc.com>
Reviewed-by: Björn Töpel <bjorn@...osinc.com>