[RFC 0/8] arm64/hw_breakpoint: Enable FEAT_Debugv8p9

[Anshuman Khandual]

This series enables FEAT_Debugv8p9 thus extending breakpoint and watchpoint
support upto 64. This has been lightly tested and still work is in progress
but would like to get some early feedback on the approach.

Possible impact of context switches while tracing kernel addresses needs to
be evaluated regarding MDSELR_EL1 access. This series is based on v6.9-rc2.

Cc: Jonathan Corbet <corbet at lwn.net>
Cc: Marc Zyngier <maz at kernel.org>
Cc: Oliver Upton <oliver.upton at linux.dev>
Cc: James Morse <james.morse at arm.com>
Cc: Suzuki K Poulose <suzuki.poulose at arm.com>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will at kernel.org>
Cc: Mark Brown <broonie at kernel.org>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: linux-arm-kernel at lists.infradead.org
Cc: kvmarm at lists.linux.dev
Cc: linux-kernel at vger.kernel.org

Anshuman Khandual (8):
  arm64/sysreg: Add register fields for MDSELR_EL1
  arm64/sysreg: Add register fields for HDFGRTR2_EL2
  arm64/sysreg: Add register fields for HDFGWTR2_EL2
  arm64/sysreg: Update ID_AA64MMFR0_EL1 register
  KVM: arm64: Explicitly handle MDSELR_EL1 traps as UNDEFINED
  arm64/cpufeature: Add field details for ID_AA64DFR1_EL1 register
  arm64/boot: Enable EL2 requirements for FEAT_Debugv8p9
  arm64/hw_breakpoint: Enable FEAT_Debugv8p9

 Documentation/arch/arm64/booting.rst    | 19 +++++++
 arch/arm64/include/asm/debug-monitors.h |  2 +-
 arch/arm64/include/asm/el2_setup.h      | 27 ++++++++++
 arch/arm64/include/asm/hw_breakpoint.h  | 46 +++++++++++++----
 arch/arm64/include/asm/kvm_arm.h        |  1 +
 arch/arm64/kernel/cpufeature.c          | 21 ++++++--
 arch/arm64/kernel/debug-monitors.c      | 16 ++++--
 arch/arm64/kernel/hw_breakpoint.c       | 33 ++++++++++++
 arch/arm64/kvm/sys_regs.c               |  1 +
 arch/arm64/tools/sysreg                 | 68 +++++++++++++++++++++++++
 10 files changed, 214 insertions(+), 20 deletions(-)

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2.25.1