From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Shuah Khan <shuah@kernel.org>
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 <broonie@kernel.org>
Subject: [PATCH v2 0/3] arm64: Support FEAT_LSFE (Large System Float Extension)
Date: Thu, 03 Jul 2025 17:23:21 +0100 [thread overview]
Message-ID: <20250703-arm64-lsfe-v2-0-eced80999cb4@kernel.org> (raw)
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 <broonie@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: 86731a2a651e58953fc949573895f2fa6d456841
change-id: 20250625-arm64-lsfe-0810cf98adc2
Best regards,
--
Mark Brown <broonie@kernel.org>
next reply other threads:[~2025-07-03 16:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-03 16:23 Mark Brown [this message]
2025-07-03 16:23 ` [PATCH v2 1/3] arm64/hwcap: Add hwcap for FEAT_LSFE Mark Brown
2025-07-03 16:23 ` [PATCH v2 2/3] KVM: arm64: Expose FEAT_LSFE to guests Mark Brown
2025-07-03 16:23 ` [PATCH v2 3/3] kselftest/arm64: Add lsfe to the hwcaps test Mark Brown
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