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Fri, 16 Oct 2026 14:48:12 -0700 (PDT) Date: Fri, 16 Oct 2026 16:48:11 -0500 From: Andy Chiu To: Radim =?iso-8859-1?Q?Krcm=E1r?= Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Paul Walmsley , Palmer Dabbelt , Alexandre Ghiti , Samuel Holland , Andy Chiu , Guodong Xu , Zong Li , Charlie Jenkins Subject: Re: [PATCH 5/6] riscv: hwprobe: Report XTheadVector only when available Message-ID: References: <20261006075303.205216-1-radim.krcmar@oss.qualcomm.com> <20261006075303.205216-6-radim.krcmar@oss.qualcomm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit 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 Reviewed-by: Andy Chiu