From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA3EE12E5D; Fri, 27 Jun 2025 17:25:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751045108; cv=none; b=f1ULHMsD+ZGTZi7o6unqWw1HDhL1mIt0xUG5VkX189MjdfhVHS9x0/7DTTF4/ETIs6L/BTw+R/zy+VJcHWLNfJZx5I/8WGwR/TNR29Y4+KF/80YKZXnmI/7N/s+HP8xiagheI+L0n8sa4BDC2W5PKJ2wdKuXcyRtbfppCZC1cEg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751045108; c=relaxed/simple; bh=TjGWey8FcBbGmqOInU155Db/0s5SY/hzFhuW5NLF6cI=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=YRUJnsyjUt76M0vW3zMJFLSogMKxbJhztT5o+vJ1UMVk0K5SLlER+D/Op5IW8ahfLjFuws0NrYVOUgQQjE5guCfg+5Ui0l1JDkHXxpszcrDc1berRUvSAYoOptNJvUA2+7A+sf+m010Vs1FPiQhD2idodd446QrnlD0aadWmHJk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kMTMx71v; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kMTMx71v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB940C4CEE3; Fri, 27 Jun 2025 17:25:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751045107; bh=TjGWey8FcBbGmqOInU155Db/0s5SY/hzFhuW5NLF6cI=; h=From:Subject:Date:To:Cc:From; b=kMTMx71v6QM/OXAP+Y0vfh2Ir0lcOSak7ALprCXKwUgIF0uKebxCPcQU3Vf13aR0z iWz+WSzDHeQLfrNGqlER6Rf4D3Bovf/AJuGCl9acOgWDuA77RUScEDfaZbxwwq14qs lTqZ86zTd+r68HGYzkYHlGSqa5tCYH9qZU2FMMbjKq0O4JryKCEtChOERdVS6BKhOX ramNyYWQ+rKpWs0nL511bBvEVdCI6R8bEyEAt/ptDzqk999Rzbr/2gy9YuVDmUy0Wk Ke78hj90sRZRzfBm8Uiho/4VvA7tQx7kI0kG5lNDMAstg+qLC9PhZpzUJuxhLnr7zz CjJbpZqTNijXg== From: Mark Brown Subject: [PATCH 0/3] arm64: Support FEAT_LSFE (Large System Float Extension) Date: Fri, 27 Jun 2025 18:20:43 +0100 Message-Id: <20250627-arm64-lsfe-v1-0-68351c4bf741@kernel.org> 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="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAOvSXmgC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDI1MDMyNT3cSiXDMT3ZzitFRdAwtDg+Q0S4vElGQjJaCGgqLUtMwKsGHRsbW 1AFdTkTtcAAAA X-Change-ID: 20250625-arm64-lsfe-0810cf98adc2 To: Catalin Marinas , Will Deacon , Jonathan Corbet , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Shuah Khan Cc: linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-kselftest@vger.kernel.org, Mark Brown X-Mailer: b4 0.15-dev-cff91 X-Developer-Signature: v=1; a=openpgp-sha256; l=1081; i=broonie@kernel.org; h=from:subject:message-id; bh=TjGWey8FcBbGmqOInU155Db/0s5SY/hzFhuW5NLF6cI=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBoXtPt0FftV/nPMAp/n+4AWdmZOj6LgUFaBlaA+ 4ex33utcbSJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaF7T7QAKCRAk1otyXVSH 0MOSB/9s8wuMp+MQz7BhZa2kE2BZucnu98xD581nSGlh0NygznHU5GiBt16nWyR/96xsxh7X6Pt 4GqJqm3TQyyYBj0V8GK9ZeBDgyW64FmjYSzvn3WcCt0rdcyzWPTBUPfGXx4YPu5I4o3HL3fz5uH 2W+Mkl10sFSBiJGJzoWlagqg/Z392OpdPSXq7ZK8BlLER1n5zicMpw50tXZK8g3aVZaa8Ozt7E8 F4PUCjnn4hk/WchuQi3P+ohPmnHYzEWIrdxC+61y0Gop+0m1esJufi4ZQxUk3QSf5EEZgxbL1dp JoIe4+SkFWRhJtRFXoKtJKFQTN6WKUWtZahW7oABwkMAPHfZ X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB FEAT_LSFE is optional from v9.5, it adds new instructions for atomic memory operations with floating point values. We have no immediate use for it in kernel, provide a hwcap so userspace can discover it and allow the ID register field to be exposed to KVM guests. Signed-off-by: Mark Brown --- Mark Brown (3): arm64/hwcap: Add hwcap for FEAT_LSFE KVM: arm64: Expose FEAT_LSFE to guests kselftest/arm64: Add lsfe to the hwcaps test Documentation/arch/arm64/elf_hwcaps.rst | 4 ++++ arch/arm64/include/asm/hwcap.h | 1 + arch/arm64/include/uapi/asm/hwcap.h | 1 + arch/arm64/kernel/cpufeature.c | 2 ++ arch/arm64/kernel/cpuinfo.c | 1 + arch/arm64/kvm/sys_regs.c | 4 +++- tools/testing/selftests/arm64/abi/hwcap.c | 21 +++++++++++++++++++++ 7 files changed, 33 insertions(+), 1 deletion(-) --- base-commit: 86731a2a651e58953fc949573895f2fa6d456841 change-id: 20250625-arm64-lsfe-0810cf98adc2 Best regards, -- Mark Brown