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[V2,0/7] arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

Message ID 20250203050828.1049370-1-anshuman.khandual@arm.com (mailing list archive)
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Series arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9 | expand

Message

Anshuman Khandual Feb. 3, 2025, 5:08 a.m. UTC 
This series adds fine grained trap control in EL2 required for FEAT_PMUv3p9
registers like PMICNTR_EL0, PMICFILTR_EL0, and PMUACR_EL1 which are already
being used in the kernel. This is required to prevent their EL1 access trap
into EL2.

PMZR_EL0 register trap control i.e HDFGWTR2_EL2.nPMZR_EL0 remains unchanged
for now as it does not get accessed in the kernel, and there is no plan for
its access from user space.

I have taken the liberty to pick up all the review tags for patches related
to tools sysreg update from the KVM FGT2 V2 patch series posted earlier.

https://lore.kernel.org/all/20241210055311.780688-1-anshuman.khandual@arm.com/

Rob had earler mentioned about FEAT_FGT2 based trap control requirement for
FEAT_PMUv3p9 registers that are currently being used in kernel. The context
can be found here.

https://lore.kernel.org/all/20241216234251.GA629562-robh@kernel.org/

This series is based on v6.14-rc1

Changes in V2:

- Rebased on v6.14-rc1
- Updated tools sysreg patches with latest DDI0601 2024-12 definitions
- Updated document version as DDI0601 2024-12 in all commit messages
- Added latest tags from Rob Herring for the last patch

Changes in V1:

https://lore.kernel.org/all/20241220072240.1003352-1-anshuman.khandual@arm.com/

Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mark Brown <robh@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Eric Auger <eric.auger@redhat.com>
Cc: kvmarm@lists.linux.dev
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org

Anshuman Khandual (7):
  arm64/sysreg: Update register fields for ID_AA64MMFR0_EL1
  arm64/sysreg: Add register fields for HDFGRTR2_EL2
  arm64/sysreg: Add register fields for HDFGWTR2_EL2
  arm64/sysreg: Add register fields for HFGITR2_EL2
  arm64/sysreg: Add register fields for HFGRTR2_EL2
  arm64/sysreg: Add register fields for HFGWTR2_EL2
  arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9

 Documentation/arch/arm64/booting.rst |  18 +++++
 arch/arm64/include/asm/el2_setup.h   |  25 +++++++
 arch/arm64/tools/sysreg              | 103 +++++++++++++++++++++++++++
 3 files changed, 146 insertions(+)