linux-kernel - Re: [PATCH v4] arm64: Add override for MPAM

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Message-ID: <87o6v6ejh5.wl-maz@kernel.org>
Date: Mon, 02 Jun 2025 07:38:30 +0100
From: Marc Zyngier <maz@...nel.org>
To: Xi Ruoyao <xry111@...111.site>
Cc: James Morse <james.morse@....com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Ben Horgan <ben.horgan@....com>,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>,
	Mingcong Bai <jeffbai@...c.io>,
	Shaopeng Tan <tan.shaopeng@...itsu.com>
Subject: Re: [PATCH v4] arm64: Add override for MPAM

On Mon, 02 Jun 2025 05:33:21 +0100,
Xi Ruoyao <xry111@...111.site> wrote:
> 
> As the message of the commit 09e6b306f3ba ("arm64: cpufeature: discover
> CPU support for MPAM") already states, if a buggy firmware fails to
> either enable MPAM or emulate the trap as if it were disabled, the
> kernel will just fail to boot.  While upgrading the firmware should be
> the best solution, we have some hardware of which the vendor have made
> no response 2 months after we requested a firmware update.  Allow
> overriding it so our devices don't become some e-waste.
> 
> Cc: James Morse <james.morse@....com>
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>
> Cc: Mingcong Bai <jeffbai@...c.io>
> Cc: Shaopeng Tan <tan.shaopeng@...itsu.com>
> Cc: Ben Horgan <ben.horgan@....com>
> Signed-off-by: Xi Ruoyao <xry111@...111.site>

Reviewed-by: Marc Zyngier <maz@...nel.org>

	M.

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