From: Conor Dooley <conor@kernel.org>
To: Guodong Xu <guodong@riscstar.com>
Cc: Rob Herring <robh@kernel.org>,
Krzysztof Kozlowski <krzk+dt@kernel.org>,
Conor Dooley <conor+dt@kernel.org>,
Samuel Holland <samuel.holland@sifive.com>,
Heinrich Schuchardt <heinrich.schuchardt@canonical.com>,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Alexandre Ghiti <alex@ghiti.fr>, Evan Green <evan@rivosinc.com>,
Andrew Jones <ajones@ventanamicro.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: riscv: Add Supm extension description
Date: Thu, 22 Jan 2026 18:52:31 +0000 [thread overview]
Message-ID: <20260122-headlamp-champion-0bbad2551d33@spud> (raw)
In-Reply-To: <20260116-supm-ext-id-v1-1-5fcf778ba4a6@riscstar.com>
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On Fri, Jan 16, 2026 at 10:10:31AM +0800, Guodong Xu wrote:
> Add description for the Supm extension. Supm indicates support for pointer
> masking in user mode. Supm is mandatory for RVA23S64.
>
> The Supm extension is ratified in commit d70011dde6c2 ("Update to ratified
> state") of riscv-j-extension.
>
> Signed-off-by: Guodong Xu <guodong@riscstar.com>
> ---
> Documentation/devicetree/bindings/riscv/extensions.yaml | 17 +++++++++++++++++
> 1 file changed, 17 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> index 4ffd61926505..1922dff03787 100644
> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> @@ -262,6 +262,23 @@ properties:
> ratified in RISC-V Profiles Version 1.0, with commit b1d806605f87
> ("Updated to ratified state.")
>
> + - const: supm
> + description: |
> + The standard Supm extension for pointer masking support in user
> + mode (U-mode) as ratified at commit d70011dde6c2 ("Update to
> + ratified state") of riscv-j-extension.
> +
> + Supm represents a combination of underlying hardware capability
> + (Smnpm or Ssnpm), U-mode consumer privilege level, and M/S-mode
Should we therefore make this require that Smnpm or Ssnpm are present?
> + software configuration that enables pointer masking for U-mode.
> +
> + DO NOT include this property in device trees targeting privileged
> + system software (S-mode or M-mode).
> +
> + This property is only appropriate in device trees provided to
> + U-mode software where the next-higher-privilege-mode supports
> + Smnpm or Ssnpm and enables it for U-mode.
> +
> - const: svade
> description: |
> The standard Svade supervisor-level extension for SW-managed PTE A/D
>
> --
> 2.43.0
>
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next prev parent reply other threads:[~2026-01-22 18:52 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-16 2:10 [PATCH 0/3] riscv: cpufeature: Add Supm extension id and validation Guodong Xu
2026-01-16 2:10 ` [PATCH 1/3] dt-bindings: riscv: Add Supm extension description Guodong Xu
2026-01-22 18:52 ` Conor Dooley [this message]
2026-01-22 23:29 ` Guodong Xu
2026-01-23 17:24 ` Conor Dooley
2026-01-16 2:10 ` [PATCH 2/3] riscv: cpufeature: Add ISA extension parsing for Supm Guodong Xu
2026-01-22 18:53 ` Conor Dooley
2026-01-16 2:10 ` [PATCH 3/3] riscv: cpufeature: Clarify ISA spec version for canonical order Guodong Xu
2026-01-22 18:56 ` Conor Dooley
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