linux-kernel - Re: [PATCH resend v3] riscv: Allow to downgrade paging mode from the command line

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Message-ID: <Y86VX3zhoSRHsewb@wendy>
Date:   Mon, 23 Jan 2023 14:10:39 +0000
From:   Conor Dooley <conor.dooley@...rochip.com>
To:     Alexandre Ghiti <alexghiti@...osinc.com>
CC:     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>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>,
        Björn Töpel <bjorn@...nel.org>
Subject: Re: [PATCH resend v3] riscv: Allow to downgrade paging mode from the
 command line

On Mon, Jan 23, 2023 at 11:51:35AM +0100, Alexandre Ghiti wrote:
> Add 2 early command line parameters that allow to downgrade satp mode
> (using the same naming as x86):
> - "no5lvl": use a 4-level page table (down from sv57 to sv48)
> - "no4lvl": use a 3-level page table (down from sv57/sv48 to 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.
> 
> Reviewed-by: Björn Töpel <bjorn@...nel.org>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
> 
> v3:
> - Massage commit log to make no4lvl clearer, as asked by Conor
> - Add a note to kernel-parameters.txt regarding the impossibility to use
>   those parameters when KASAN is enabled, as suggested by Conor

For the improved descriptions & commit message:
Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>

Apologies for complaining about the missing changelog earlier!

Conor.


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