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 CC73BE555; Mon, 18 Aug 2025 19:26:23 +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=1755545183; cv=none; b=SjGPiulzhakX/PkdezRF/FIsnn58PSqFRa2SoVrXHvsr0evBxXhOEaM/Gu2TnBAkT0V4SSD0Obz5iZxUrVGXHe8FU1P1180vXbY/GJXm0SdVByD6qLNVmqw3SjTmuiU+aHiYOQUM9iMSxHhO/PbQXQ4qIwY8pohHqhUUymuqUz8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755545183; c=relaxed/simple; bh=+y/vOOo8jAZA17Jtz8gRMU0zs0a5jt47Bouz8MVv3Wg=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=tu9Guv4YxTkS7O2py7ILd9YV1bsg0wTGKFUQaSly+9c25prviC8B0zL9yMl81MyMc6jxUIMaDWFEToTyXhO48A8NytWm47Nluo8xHtosPcxs7vZ7tS6CpgOtrnbWLrQV6r7mu5c+fYWu1yUPwh54rVZRXs+Fx778qhbrEdHvapA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qfDDwrE+; 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="qfDDwrE+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2A2F9C4CEEB; Mon, 18 Aug 2025 19:26:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755545183; bh=+y/vOOo8jAZA17Jtz8gRMU0zs0a5jt47Bouz8MVv3Wg=; h=From:Subject:Date:To:Cc:From; b=qfDDwrE+BVp5zL1+EDWcdMm7DmF/RDfc139D2y/CQIlaGUYVodu81jkwikSMnQAp9 I6RIQpL6z+vUbr3V7f/oao7P8ecH/sO6LvAa8gv51EltIpuqfeFBLOPDwjrF1O/XCq ARoyCzVY3yd1NvKMFVR6KGeaRKuc5mP30SqfNLuf/Psh7+Mxtli77t09TWya4cAkaf 7eaPmhtMhH5/niq6dqMUg+SdujDRCt50ZzIhPsb4uyR4K+LfRgdZC+A6QpQroNGfKu 3v/o6HbGyBOre8ZFJYdaycQMX+ZajkeTaG4trVyK3qk3A6yClCydTDmX7dlovz2KPi P8EBQe0D/+0Ww== From: Mark Brown Subject: [PATCH v3 0/3] arm64: Support FEAT_LSFE (Large System Float Extension) Date: Mon, 18 Aug 2025 20:21:17 +0100 Message-Id: <20250818-arm64-lsfe-v3-0-af6f4d66eb39@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=H4sIAC59o2gC/1XMQQ6CMBCF4auQrq2ZlgKtK+9hXECZQiOCmZpGQ 7i7hcQoy/eS/5tZQPIY2CmbGWH0wU9jGvkhY7avxw65b9NmEmQBpSx4TfdS8SE45KAFWGd03Vr JUvAgdP61YZdr2r0Pz4nemx3F+n6Z6p+JggMvdV4IqxpXKXG+IY04HCfq2OpE+WsryHetTC1ab DUYY2yjdu2yLB+mc/9x4QAAAA== 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=1372; i=broonie@kernel.org; h=from:subject:message-id; bh=+y/vOOo8jAZA17Jtz8gRMU0zs0a5jt47Bouz8MVv3Wg=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBoo35Z9ywOmVIYyAGuED3un6+Vp7m7E8UOzL3eO oaGa9ejrgyJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaKN+WQAKCRAk1otyXVSH 0Pn0B/9Lgel83JGwfCO6weWZrwLTSxZ2NGgB1wsezpQ0o8+jWonTcI42s6sUDwa5kbmTm29twd3 au1tIWNztBPPSfYtmfR013a77/8OggTudCW3WkyBYW60gOe+W7oO9VZ7ncmJjl0KdLpga9/CJo2 QrcJs0AQeSYSfDSX2aUFarsYAeJf0BOpcZQQqFmRcBJeEYfOXJuoPISSlTl2QToQGQbEIsSsuHZ czwK5wGZhCDuyu3Rz5InsNXmq1P2Yw0DbkfMp0rYdaX6NClG3rFT6zQD59hMfeqRpSHeCawPxMD Tpj8xMNFP4Z9IbXUBYDpqVYc5Y1Csw1L4AH82yeJPogRglaZ 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 --- Changes in v3: - Rebase onto v6.17-rc1. - Link to v2: https://lore.kernel.org/r/20250703-arm64-lsfe-v2-0-eced80999cb4@kernel.org Changes in v2: - Fix result of vi dropping in hwcap test. - Link to v1: https://lore.kernel.org/r/20250627-arm64-lsfe-v1-0-68351c4bf741@kernel.org --- 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: 8f5ae30d69d7543eee0d70083daf4de8fe15d585 change-id: 20250625-arm64-lsfe-0810cf98adc2 Best regards, -- Mark Brown