From: Andy Chiu <tchiu@tenstorrent.com>
To: "Radim Krcmár" <radim.krcmar@oss.qualcomm.com>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
Paul Walmsley <pjw@kernel.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Alexandre Ghiti <alex@ghiti.fr>,
Samuel Holland <samuel.holland@sifive.com>,
Andy Chiu <andybnac@gmail.com>, Guodong Xu <guodong@riscstar.com>,
Zong Li <zong.li@sifive.com>,
Charlie Jenkins <thecharlesjenkins@gmail.com>
Subject: Re: [PATCH 4/6] riscv: hwprobe: Report Supm only when available
Date: Fri, 16 Oct 2026 16:26:03 -0500 [thread overview]
Message-ID: <atKWa5PU2ECSgocI@Tao-Chiu's-Mac> (raw)
In-Reply-To: <20261006075303.205216-5-radim.krcmar@oss.qualcomm.com>
On Tue, Oct 06, 2026 at 09:53:01AM +0200, Radim Krcmár wrote:
> The RISC-V ISA defines Supm as
>
> "An extension that indicates that there is pointer-masking support
> available in user mode, with some facility provided in the application
> execution environment to control pointer masking."
>
> Our facility always returns -EINVAL unless Supm support is configured,
> the pointer masking ISA extension is globally present, and the user-mode
> is running in 64-bit mode.
>
> Hiding Supm in compat tasks would add complexity that doesn't seem
> justified as 32-bit code has no reason to look at Supm anyway.
> Reporting based on the a global sysctl toggle isn't done.
>
> Do not report Supm when some harts lack the extension, because it's not
> available on any hart in that case.
>
> (Reporting Supm when only PMLEN=0 is supported isn't great, but doesn't
> violate the text of the extension and we ought to have Supm7 and Supm16
> extensions if we care about precision.)
>
> Fixes: 3c2e0aff7b4f ("riscv: hwprobe: Export the Supm ISA extension")
> Signed-off-by: Radim Krcmár <radim.krcmar@oss.qualcomm.com>
Reviewed-by: Andy Chiu <tchiu@tenstorrent.com>
> ---
> The compat hiding and global sysctl toggle better fit in Andy's series.
>
Sorry, I am not aware of any ongoing series that does the compat hiding,
but I will keep an eye on it.
Thanks,
Andy
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next prev parent reply other threads:[~2026-10-16 21:26 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-06 7:52 [PATCH 0/6] riscv: hwprobe: do not report disabled extensions Radim Krčmář
2026-10-06 7:52 ` [PATCH 1/6] riscv: hwprobe: Report FP extensions only when available Radim Krčmář
2026-10-06 23:54 ` Charlie Jenkins
2026-10-07 7:46 ` Radim Krčmář
2026-10-07 8:05 ` Charlie Jenkins
2026-10-16 21:04 ` Andy Chiu
2026-10-06 7:52 ` [PATCH 2/6] riscv: hwprobe: Report Zicbom and Zicboz " Radim Krčmář
2026-10-16 4:28 ` Charlie Jenkins
2026-10-16 21:06 ` Andy Chiu
2026-10-06 7:53 ` [PATCH 3/6] riscv: hwprobe: Report Zicfilp and Zicfiss " Radim Krčmář
2026-10-16 4:28 ` Charlie Jenkins
2026-10-16 21:09 ` Andy Chiu
2026-10-06 7:53 ` [PATCH 4/6] riscv: hwprobe: Report Supm " Radim Krčmář
2026-10-16 4:28 ` Charlie Jenkins
2026-10-16 21:26 ` Andy Chiu [this message]
2026-10-16 21:45 ` Andy Chiu
2026-10-06 7:53 ` [PATCH 5/6] riscv: hwprobe: Report XTheadVector " Radim Krčmář
2026-10-06 23:54 ` Charlie Jenkins
2026-10-07 7:59 ` Radim Krčmář
2026-10-07 8:07 ` Charlie Jenkins
2026-10-16 21:48 ` Andy Chiu
2026-10-06 7:53 ` [PATCH 6/6] riscv: hwprobe: Report SiFive vector extensions " Radim Krčmář
2026-10-16 21:55 ` Andy Chiu
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