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From: "Björn Töpel" <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>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-riscv@lists.infradead.org
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: Re: [PATCH v2] riscv: Allow to downgrade paging mode from the command line
Date: Thu, 15 Dec 2022 12:30:46 +0100	[thread overview]
Message-ID: <87359ggazd.fsf@all.your.base.are.belong.to.us> (raw)
In-Reply-To: <20221215081948.1256610-1-alexghiti@rivosinc.com>

Alexandre Ghiti <alexghiti@rivosinc.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@rivosinc.com>

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

WARNING: multiple messages have this Message-ID (diff)
From: "Björn Töpel" <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>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-riscv@lists.infradead.org
Cc: Alexandre Ghiti <alexghiti@rivosinc.com>
Subject: Re: [PATCH v2] riscv: Allow to downgrade paging mode from the command line
Date: Thu, 15 Dec 2022 12:30:46 +0100	[thread overview]
Message-ID: <87359ggazd.fsf@all.your.base.are.belong.to.us> (raw)
In-Reply-To: <20221215081948.1256610-1-alexghiti@rivosinc.com>

Alexandre Ghiti <alexghiti@rivosinc.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@rivosinc.com>

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

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  reply	other threads:[~2022-12-15 11:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-15  8:19 [PATCH v2] riscv: Allow to downgrade paging mode from the command line Alexandre Ghiti
2022-12-15  8:19 ` Alexandre Ghiti
2022-12-15 11:30 ` Björn Töpel [this message]
2022-12-15 11:30   ` Björn Töpel
2022-12-21 22:27 ` Conor Dooley
2022-12-21 22:27   ` Conor Dooley
2022-12-22 11:32   ` Alexandre Ghiti
2022-12-22 11:32     ` Alexandre Ghiti

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