linux-kernel - [PATCH v2 00/21] arm64: Support for 2023 DPISA extensions

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Message-Id: <20231114-arm64-2023-dpisa-v2-0-47251894f6a8@kernel.org>
Date:   Tue, 14 Nov 2023 14:34:45 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Jonathan Corbet <corbet@....net>, Shuah Khan <shuah@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kvmarm@...ts.linux.dev, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: [PATCH v2 00/21] arm64: Support for 2023 DPISA extensions

This series enables support for the data processing extensions in the
newly released 2023 architecture, this is mainly support for 8 bit
floating point formats.  Most of the extensions only introduce new
instructions and therefore only require hwcaps but there is a new EL0
visible control register FPMR used to control the 8 bit floating point
formats, we need to manage traps for this and context switch it.

The sharing of floating point save code between the host and guest
kernels slightly complicates the introduction of KVM support, we first
introduce host support with some placeholders for KVM then replace those
with the actual KVM support.

I've not added test coverage for ptrace, I've got a not quite finished
test program which exercises all the FP ptrace interfaces and their
interactions together, my plan is to cover it there rather than add
another tiny test program that duplicates the boilerplace for tracing a
target and doesn't actually run the traced program.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v2:
- Rebase onto v6.7-rc1.
- Link to v1: https://lore.kernel.org/r/20231026-arm64-2023-dpisa-v1-0-8470dd989bb2@kernel.org

---
Mark Brown (21):
      arm64/sysreg: Add definition for ID_AA64PFR2_EL1
      arm64/sysreg: Update ID_AA64ISAR2_EL1 defintion for DDI0601 2023-09
      arm64/sysreg: Add definition for ID_AA64ISAR3_EL1
      arm64/sysreg: Add definition for ID_AA64FPFR0_EL1
      arm64/sysreg: Update ID_AA64SMFR0_EL1 definition for DDI0601 2023-09
      arm64/sysreg: Update SCTLR_EL1 for DDI0601 2023-09
      arm64/sysreg: Update HCRX_EL2 definition for DDI0601 2023-09
      arm64/sysreg: Add definition for FPMR
      arm64/cpufeature: Hook new identification registers up to cpufeature
      arm64/fpsimd: Enable host kernel access to FPMR
      arm64/fpsimd: Support FEAT_FPMR
      arm64/signal: Add FPMR signal handling
      arm64/ptrace: Expose FPMR via ptrace
      KVM: arm64: Add newly allocated ID registers to register descriptions
      KVM: arm64: Support FEAT_FPMR for guests
      arm64/hwcap: Define hwcaps for 2023 DPISA features
      kselftest/arm64: Handle FPMR context in generic signal frame parser
      kselftest/arm64: Add basic FPMR test
      kselftest/arm64: Add 2023 DPISA hwcap test coverage
      KVM: arm64: selftests: Document feature registers added in 2023 extensions
      KVM: arm64: selftests: Teach get-reg-list about FPMR

 Documentation/arch/arm64/elf_hwcaps.rst            |  49 +++++
 arch/arm64/include/asm/cpu.h                       |   3 +
 arch/arm64/include/asm/cpufeature.h                |   5 +
 arch/arm64/include/asm/fpsimd.h                    |   2 +
 arch/arm64/include/asm/hwcap.h                     |  15 ++
 arch/arm64/include/asm/kvm_arm.h                   |   4 +-
 arch/arm64/include/asm/kvm_host.h                  |   3 +
 arch/arm64/include/asm/processor.h                 |   2 +
 arch/arm64/include/uapi/asm/hwcap.h                |  15 ++
 arch/arm64/include/uapi/asm/sigcontext.h           |   8 +
 arch/arm64/kernel/cpufeature.c                     |  72 +++++++
 arch/arm64/kernel/cpuinfo.c                        |  18 ++
 arch/arm64/kernel/fpsimd.c                         |  13 ++
 arch/arm64/kernel/ptrace.c                         |  42 ++++
 arch/arm64/kernel/signal.c                         |  59 ++++++
 arch/arm64/kvm/fpsimd.c                            |  19 +-
 arch/arm64/kvm/hyp/include/hyp/switch.h            |   7 +-
 arch/arm64/kvm/sys_regs.c                          |  17 +-
 arch/arm64/tools/cpucaps                           |   1 +
 arch/arm64/tools/sysreg                            | 153 ++++++++++++++-
 include/uapi/linux/elf.h                           |   1 +
 tools/testing/selftests/arm64/abi/hwcap.c          | 217 +++++++++++++++++++++
 tools/testing/selftests/arm64/signal/.gitignore    |   1 +
 .../arm64/signal/testcases/fpmr_siginfo.c          |  82 ++++++++
 .../selftests/arm64/signal/testcases/testcases.c   |   8 +
 .../selftests/arm64/signal/testcases/testcases.h   |   1 +
 tools/testing/selftests/kvm/aarch64/get-reg-list.c |  11 +-
 27 files changed, 810 insertions(+), 18 deletions(-)
---
base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
change-id: 20231003-arm64-2023-dpisa-2f3d25746474

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