linux-kernel - Re: [PATCH 2/3] riscv: cpufeature: Add ISA extension parsing for Supm

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Message-ID: <20260122-brethren-overeager-fa3d3b6fb0cf@spud>
Date: Thu, 22 Jan 2026 18:53:26 +0000
From: Conor Dooley <conor@...nel.org>
To: Guodong Xu <guodong@...cstar.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Samuel Holland <samuel.holland@...ive.com>,
	Heinrich Schuchardt <heinrich.schuchardt@...onical.com>,
	Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Evan Green <evan@...osinc.com>,
	Andrew Jones <ajones@...tanamicro.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	devicetree@...r.kernel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] riscv: cpufeature: Add ISA extension parsing for Supm

On Fri, Jan 16, 2026 at 10:10:32AM +0800, Guodong Xu wrote:
> Supm has been ratified in the RISC-V Pointer Masking specification
> (Version 1.0, 10/2024) and is mandated in RVA23 Profiles (Version 1.0,
> 2024-10-17) for RVA23U64. Supm indicates userspace pointer masking
> support.
> 
> Remove the previous macro aliasing of Supm to Ssnpm/Smnpm in hwcap.h,
> treating Supm as a distinct RISC-V ISA extension ID.
> 
> Add ISA parsing logic for Supm, and implement a validator to ensure
> that Supm is only reported as available if Kconfig allows it and the
> underlying Ssnpm (for supervisor mode) or Smnpm (for machine mode)
> extension is present. Supm relies on Ssnpm or Smnpm to provide the
> underlying hardware implementation.
> 
> With this change, "supm" will be reported (when available) in
> /proc/cpuinfo as part of the "isa" and "hart isa" string.
> 
> Link: https://lore.kernel.org/lkml/20260101-legume-engraved-0fae8282cfbe@spud/#r [1]
> Link: https://lore.kernel.org/all/4ebbe14b-2579-4ba6-808d-d50c24641d04@sifive.com/#r [2]
> Signed-off-by: Guodong Xu <guodong@...cstar.com>

Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>


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