From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>,
James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Jonathan Corbet <corbet@lwn.net>, Shuah Khan <shuah@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dave Martin <dave.martin@arm.com>,
kvmarm@lists.linux.dev, linux-doc@vger.kernel.org,
linux-kselftest@vger.kernel.org, Mark Brown <broonie@kernel.org>
Subject: [PATCH v4 00/14] arm64: Support for 2023 DPISA extensions
Date: Mon, 22 Jan 2024 16:28:03 +0000 [thread overview]
Message-ID: <20240122-arm64-2023-dpisa-v4-0-776e094861df@kernel.org> (raw)
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.
Due to uncertainty with the plan for parsing ID registers to identify
which features to expose to the guest the KVM support is placed at the
end of the series, it will need to be revised once that issue is
resolved. 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 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@kernel.org>
---
Changes in v4:
- Rebase onto v6.8-rc1.
- Move KVM support to the end of the series.
- Link to v3: https://lore.kernel.org/r/20231205-arm64-2023-dpisa-v3-0-dbcbcd867a7f@kernel.org
Changes in v3:
- Rebase onto v6.7-rc3.
- Hook up traps for FPMR in emulate-nested.c.
- Link to v2: https://lore.kernel.org/r/20231114-arm64-2023-dpisa-v2-0-47251894f6a8@kernel.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 (14):
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
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: Share all userspace hardened thread data with the hypervisor
KVM: arm64: Add newly allocated ID registers to register descriptions
KVM: arm64: Support FEAT_FPMR for guests
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 | 5 +-
arch/arm64/include/asm/processor.h | 6 +-
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/emulate-nested.c | 8 +
arch/arm64/kvm/fpsimd.c | 14 +-
arch/arm64/kvm/hyp/include/hyp/switch.h | 9 +-
arch/arm64/kvm/hyp/nvhe/hyp-main.c | 4 +-
arch/arm64/kvm/sys_regs.c | 17 +-
arch/arm64/tools/cpucaps | 1 +
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 +-
28 files changed, 670 insertions(+), 20 deletions(-)
---
base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
change-id: 20231003-arm64-2023-dpisa-2f3d25746474
Best regards,
--
Mark Brown <broonie@kernel.org>
next reply other threads:[~2024-01-22 16:28 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-22 16:28 Mark Brown [this message]
2024-01-22 16:28 ` [PATCH v4 01/14] arm64/cpufeature: Hook new identification registers up to cpufeature Mark Brown
2024-01-22 16:28 ` [PATCH v4 02/14] arm64/fpsimd: Enable host kernel access to FPMR Mark Brown
2024-02-23 11:34 ` Marc Zyngier
2024-01-22 16:28 ` [PATCH v4 03/14] arm64/fpsimd: Support FEAT_FPMR Mark Brown
2024-02-23 11:07 ` Marc Zyngier
2024-03-06 16:41 ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 04/14] arm64/signal: Add FPMR signal handling Mark Brown
2024-01-22 16:28 ` [PATCH v4 05/14] arm64/ptrace: Expose FPMR via ptrace Mark Brown
2024-01-22 16:28 ` [PATCH v4 06/14] arm64/hwcap: Define hwcaps for 2023 DPISA features Mark Brown
2024-01-22 16:28 ` [PATCH v4 07/14] kselftest/arm64: Handle FPMR context in generic signal frame parser Mark Brown
2024-01-22 16:28 ` [PATCH v4 08/14] kselftest/arm64: Add basic FPMR test Mark Brown
2024-01-22 16:28 ` [PATCH v4 09/14] kselftest/arm64: Add 2023 DPISA hwcap test coverage Mark Brown
2024-01-22 16:28 ` [PATCH v4 10/14] KVM: arm64: Share all userspace hardened thread data with the hypervisor Mark Brown
2024-01-22 16:28 ` [PATCH v4 11/14] KVM: arm64: Add newly allocated ID registers to register descriptions Mark Brown
2024-02-23 11:33 ` Marc Zyngier
2024-01-22 16:28 ` [PATCH v4 12/14] KVM: arm64: Support FEAT_FPMR for guests Mark Brown
2024-02-23 11:18 ` Marc Zyngier
2024-02-23 14:46 ` Mark Brown
2024-01-22 16:28 ` [PATCH v4 13/14] KVM: arm64: selftests: Document feature registers added in 2023 extensions Mark Brown
2024-01-22 16:28 ` [PATCH v4 14/14] KVM: arm64: selftests: Teach get-reg-list about FPMR Mark Brown
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