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 5/6] riscv: hwprobe: Report XTheadVector only when available
Date: Fri, 16 Oct 2026 16:48:11 -0500 [thread overview]
Message-ID: <atKbm-EG7wCL0bpo@Tao-Chiu's-Mac> (raw)
In-Reply-To: <20261006075303.205216-6-radim.krcmar@oss.qualcomm.com>
On Tue, Oct 06, 2026 at 09:53:02AM +0200, Radim Krcmár wrote:
> User-mode use of XTheadVector requires non-Off sstatus.VS, which we set
> only when has_xtheadvector() (CONFIG_RISCV_ISA_XTHEADVECTOR and
> XTheadVector on all harts). XTheadVector also bundles operations with
> floating state, which additionally requires non-Off sstatus.FS and hence
> has_fpu(). hwprobe reports XTheadVector from the per-hart vendor ISA
> bitmaps alone, so it can advertise an extension that is always disabled
> in user-mode.
>
> Report correct environment to user-mode.
>
> Fixes: a5ea53da65c5 ("riscv: hwprobe: Add thead vendor extension probing")
> Signed-off-by: Radim Krcmár <radim.krcmar@oss.qualcomm.com>
Reviewed-by: Andy Chiu <tchiu@tenstorrent.com>
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next prev parent reply other threads:[~2026-10-16 21:48 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
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 [this message]
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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