linux-kernel - Re: [PATCH v2] riscv: Allow to downgrade paging mode from the command line

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Message-ID: <87359ggazd.fsf@all.your.base.are.belong.to.us>
Date:   Thu, 15 Dec 2022 12:30:46 +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>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Cc:     Alexandre Ghiti <alexghiti@...osinc.com>
Subject: Re: [PATCH v2] riscv: Allow to downgrade paging mode from the
 command line

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

> Add 2 early command line parameters called "no5lvl" and "no4lvl" (using
> the same naming as x86) to allow a user to downgrade from sv57 (the
> default mode if the hardware supports it) to sv48 or sv39.
>
> Note that going through the device tree to get the kernel command line
> works with ACPI too since the efi stub creates a device tree anyway with
> the command line.
>
> Also, as those params are treated very early in the boot process and we
> use standard device tree functions that may be kasan instrumented, we
> only enable them for !KASAN configurations.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>

Reviewed-by: Björn Töpel <bjorn@...nel.org>