[PATCH v5 0/5] arm64: Support 2024 dpISA extensions

Mark Brown
2025-01-07T23:01:12Z

The 2024 architecture release includes a number of data processing
extensions, mostly SVE and SME additions with a few others. These are
all very straightforward extensions which add instructions but no
architectural state so only need hwcaps and exposing of the ID registers
to KVM guests and userspace.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
Changes in v5:
- Rebase onto arm64/for-next/cpufeature, which incorporates most of the
sysreg updates from earlier versions.
- Remove SF8MM8 and SF8MM4 register defintitions which were removed from
the ISA in the 2024-12 XML release, along with their associated hwcaps.
- Incorporate Marc's fix for SVE hwcaps on SME only systems and update
the hwcaps for the newly added features to follow the same pattern.
- Link to v4: https://lore.kernel.org/r/20241211-arm64-2024-dpisa-v4-0-0fd403876df2@kernel.org

Changes in v4:
- Fix encodings for ID_AA64ISAR3_EL1.
- Link to v3: https://lore.kernel.org/r/20241203-arm64-2024-dpisa-v3-0-a6c78b1aa297@kernel.org

Changes in v3:
- Commit log update for the hwcap test.
- Link to v2: https://lore.kernel.org/r/20241030-arm64-2024-dpisa-v2-0-b6601a15d2a5@kernel.org

Changes in v2:
- Filter KVM guest visible bitfields in ID_AA64ISAR3_EL1 to only those
we make writeable.
- Link to v1: https://lore.kernel.org/r/20241028-arm64-2024-dpisa-v1-0-a38d08b008a8@kernel.org

---
Marc Zyngier (1):
arm64: Filter out SVE hwcaps when FEAT_SVE isn't implemented

Mark Brown (4):
arm64/sysreg: Update ID_AA64SMFR0_EL1 to DDI0601 2024-12
arm64/hwcap: Describe 2024 dpISA extensions to userspace
KVM: arm64: Allow control of dpISA extensions in ID_AA64ISAR3_EL1
kselftest/arm64: Add 2024 dpISA extensions to hwcap test

Documentation/arch/arm64/elf_hwcaps.rst | 89 +++++++++--
arch/arm64/include/asm/hwcap.h | 15 ++
arch/arm64/include/uapi/asm/hwcap.h | 15 ++
arch/arm64/kernel/cpufeature.c | 71 +++++++--
arch/arm64/kernel/cpuinfo.c | 15 ++
arch/arm64/kvm/sys_regs.c | 6 +-
arch/arm64/tools/sysreg | 26 +++-
tools/testing/selftests/arm64/abi/hwcap.c | 235 +++++++++++++++++++++++++++++-
8 files changed, 441 insertions(+), 31 deletions(-)
---
base-commit: d66e21d59ed0e043e68ef8c6541c1e9f1a962614
change-id: 20241008-arm64-2024-dpisa-8091074a7f48

Best regards,
--
Mark Brown <broonie@kernel.org>