linux-kernel - Re: [PATCH RFC 1/3] dt-bindings: riscv: Add Svukte entry

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Message-ID: <20240921-shock-purge-d91482d191a1@spud>
Date: Sat, 21 Sep 2024 23:05:53 +0100
From: Conor Dooley <conor@...nel.org>
To: Max Hsu <max.hsu@...ive.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	Palmer Dabbelt <palmer@...ive.com>, linux-riscv@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org,
	Samuel Holland <samuel.holland@...ive.com>
Subject: Re: [PATCH RFC 1/3] dt-bindings: riscv: Add Svukte entry

On Fri, Sep 20, 2024 at 03:39:03PM +0800, Max Hsu wrote:
> Add an entry for the Svukte extension to the riscv,isa-extensions
> property.
> 
> Reviewed-by: Samuel Holland <samuel.holland@...ive.com>
> Signed-off-by: Max Hsu <max.hsu@...ive.com>
> ---
>  Documentation/devicetree/bindings/riscv/extensions.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/extensions.yaml b/Documentation/devicetree/bindings/riscv/extensions.yaml
> index a06dbc6b4928958704855c8993291b036e3d1a63..df96aea5e53a70b0cb8905332464a42a264e56e6 100644
> --- a/Documentation/devicetree/bindings/riscv/extensions.yaml
> +++ b/Documentation/devicetree/bindings/riscv/extensions.yaml
> @@ -171,6 +171,13 @@ properties:
>              memory types as ratified in the 20191213 version of the privileged
>              ISA specification.
>  
> +        - const: svukte
> +          description:
> +            The standard Svukte supervisor-level extensions for making user-mode
> +            accesses to supervisor memory raise page faults in constant time,
> +            mitigating attacks that attempt to discover the supervisor
> +            software's address-space layout, as PR#1564 of riscv-isa-manual.

I'm surprised this doesn't fail dt_binding_check, with the # in it. I'd
like to see a commit hash here though, in the same format as the other
extensions using them.

> +
>          - const: zacas
>            description: |
>              The Zacas extension for Atomic Compare-and-Swap (CAS) instructions
> 
> -- 
> 2.43.2
> 

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