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 5CD412E2EF3; Thu, 18 Sep 2025 19:44:28 +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=1758224669; cv=none; b=NxJcGjMG45mAwWGJv1HeTOxAB9JgNcYkPGFsm5FdmQu6lIOcFXhjyJUMDh+69oZvK9vnul6TA4lmwLItq0E69HMXfGg/AH7MonmaBHaV3mHRaCGZoMmV5bc76ttbbP5bdRmTclZOLRdZE3ldC3xvviBVtQf4Ii+ssimCrVdX6VM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758224669; c=relaxed/simple; bh=/fyRtjX7Acq7Ib/RG2oDrAdMcjvCIkWa8I5Em83Gg64=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=l22oLb+luEjUYKHLD0PHPkW1sT3Q97wOfvuz0QFvWbdZwWh3uCpTka34IxV8ye2ild64uTuqkvBJgo9zbM/xTiIS2EMB2lwtXF1ZNMzmiqxJO8J6UtCHHvgqfau4ws3x3gzjMInaua3OSDODOYmTkdSOZ2+CRBM1n9qKnxAesJo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PW3c6aFV; 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="PW3c6aFV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7DD07C4CEE7; Thu, 18 Sep 2025 19:44:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1758224668; bh=/fyRtjX7Acq7Ib/RG2oDrAdMcjvCIkWa8I5Em83Gg64=; h=From:Subject:Date:To:Cc:From; b=PW3c6aFVxiQWITh6uQ/YoOHRKxxI3L9bEFBR6TwvzK3VAt9z2AzpTVgc/j+W6yO6W nkn16qJAv7CO+ycRjZIgiq+cT46fXqA5py/CN5FasGMgCtDWP9Ps4sN+6SGurZtyJN xNF3Y85SGQUlejYbaLp40z1mSwsmA+knuaFXPUdyrEWgfkJ5LhhC88g3FDGPObVPvr 8E3GsSL1dOri2YE0qVPyK4iP+0LE/h7Au+Jx09CpfN2jouhrIOqyt+YanXECchgfrZ +p1NDzYH5oNYrJV48B1umx3nLZudUkiSvgwiP/atuE79dnBYbRmpjgH1tPaEwk1p44 6uK4LkE1X7s7Q== From: Mark Brown Subject: [PATCH v4 0/2] arm64: Support FEAT_LSFE (Large System Float Extension) Date: Thu, 18 Sep 2025 20:42:05 +0100 Message-Id: <20250918-arm64-lsfe-v4-0-0abc712101c7@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@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=H4sIAI5gzGgC/2XM3wqCMByG4VuRHbfYP+fWUfcRHej2m45MY4tRi PfeFMKkw++D551QhOAholMxoQDJRz8OeYhDgUxXDy1gb/NGjLCSSFbiOtylwH10gImixDitams YyuARwPnXGrtc8+58fI7hvbYTXd5vpvrNJIoJloqX1IjGVYKebxAG6I9jaNHSSWyzFeE7y7IFA 1YRrbVpxJ/lm1VU7SzPtnbSCSslNFzv7DzPH9T48Y0dAQAA 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-56183 X-Developer-Signature: v=1; a=openpgp-sha256; l=1367; i=broonie@kernel.org; h=from:subject:message-id; bh=/fyRtjX7Acq7Ib/RG2oDrAdMcjvCIkWa8I5Em83Gg64=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBozGEW5FyWseaqc8/F+wIiqySykyyfiEMwETJHD 3x47bVLit6JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCaMxhFgAKCRAk1otyXVSH 0MnLB/sEOZMOHVacNMWbkkwuSaxy58fOnDcDG3q5SSd4PYa/uO6lM9ZG4SYsH1bv7w0L350Oml5 /05e0opT3uGxlCmhQL2AcdMQF8bEw45kMI6pe7XDKC0oNu5sL0D1PSUP9psLPM82dsK5FszB87U gkisjR3K77ju9UxZbtP2bQJbRBg0FW1PeIv6K1gD9dwfEkEoVyqnKblRP6eQ4jyDHFwdqmHSbJF vMQ5uXgp+3m0gAibiPJuhNUt4umwF2ktg6gC/4y0SXM/0jEMC/rSycbv4smm0hAXYqvWGc6l2TR 8/IsnwQrH8X7xO1FsCqOpRQlONJtdgwaTwvbqLTp63iIfltT 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 v4: - Rebase onto arm64/for-next/cpufeature, note that both patches have build dependencies on this. - Drop unneeded cc clobber in hwcap. - Use STRFADD as the instruction probed in hwcap. - Link to v3: https://lore.kernel.org/r/20250818-arm64-lsfe-v3-0-af6f4d66eb39@kernel.org 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 (2): KVM: arm64: Expose FEAT_LSFE to guests kselftest/arm64: Add lsfe to the hwcaps test arch/arm64/kvm/sys_regs.c | 4 +++- tools/testing/selftests/arm64/abi/hwcap.c | 21 +++++++++++++++++++++ 2 files changed, 24 insertions(+), 1 deletion(-) --- base-commit: 220928e52cb03d223b3acad3888baf0687486d21 change-id: 20250625-arm64-lsfe-0810cf98adc2 Best regards, -- Mark Brown