From:   =?utf-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>
To:     Alexandre Ghiti <alexghiti@rivosinc.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Conor Dooley <conor@kernel.org>,
        Ard Biesheuvel <ardb@kernel.org>, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
Cc:     Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: Re: [PATCH v4 0/1] riscv: Allow to downgrade paging mode from the
 command line
In-Reply-To: <20230131151115.1972740-1-alexghiti@rivosinc.com>
References: <20230131151115.1972740-1-alexghiti@rivosinc.com>
Date:   Fri, 17 Feb 2023 15:48:00 +0100
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Alexandre Ghiti <alexghiti@rivosinc.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: Bj=C3=B6rn T=C3=B6pel <bjorn@rivosinc.com>
Reviewed-by: Bj=C3=B6rn T=C3=B6pel <bjorn@rivosinc.com>