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* [PATCH v8 0/4] E0PD support
@ 2019-11-08 17:01 Mark Brown
  2019-11-08 17:01 ` [PATCH v8 1/4] arm64: Add initial support for E0PD Mark Brown
                   ` (3 more replies)
  0 siblings, 4 replies; 12+ messages in thread
From: Mark Brown @ 2019-11-08 17:01 UTC (permalink / raw)
  To: Catalin Marinas, Will Deacon, Suzuki K Poulose
  Cc: Mark Brown, linux-arm-kernel

This series adds support for E0PD. We enable E0PD unconditionally where
present on systems where all the CPUs in the system support E0PD and
change to not enabling KPTI by default on systems where we have enabled
E0PD. It also converts the runtime checks for use of non-global mappings
into a variable.

v8: Keep the explicit MIDR check for TX1 so things work properly in
    early init and tweak comments.
v7: Move early initialization to the start of setup_arch()
v6: Move early initialization earlier.
v5: Rebase on v5.4-rc3 (there will be conflicts in cpucaps.h) and add
    code in patch 4 to start making non-global mappings from boot if we
    know then that we will need KPTI, preserving an existing performance
    improvement.
v4: Use a variable to store our decision about using non-global mappings
    rather than rechecking constantly at runtime. I've added this as a
    separate patch mainly for bisection.
v3: Make E0PD a system wide feature.

Mark Brown (4):
  arm64: Add initial support for E0PD
  arm64: Factor out checks for KASLR in KPTI code into separate function
  arm64: Don't use KPTI where we have E0PD
  arm64: Use a variable to store non-global mappings decision

 arch/arm64/Kconfig                     | 15 +++++
 arch/arm64/include/asm/cpucaps.h       |  3 +-
 arch/arm64/include/asm/mmu.h           | 48 ++--------------
 arch/arm64/include/asm/pgtable-hwdef.h |  2 +
 arch/arm64/include/asm/pgtable-prot.h  |  4 +-
 arch/arm64/include/asm/sysreg.h        |  1 +
 arch/arm64/kernel/cpufeature.c         | 77 ++++++++++++++++++++++++--
 arch/arm64/kernel/setup.c              |  7 +++
 8 files changed, 106 insertions(+), 51 deletions(-)

-- 
2.20.1


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^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2019-11-11 17:36 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-11-08 17:01 [PATCH v8 0/4] E0PD support Mark Brown
2019-11-08 17:01 ` [PATCH v8 1/4] arm64: Add initial support for E0PD Mark Brown
2019-11-11 14:22   ` Suzuki K Poulose
2019-11-11 17:35     ` Mark Brown
2019-11-08 17:01 ` [PATCH v8 2/4] arm64: Factor out checks for KASLR in KPTI code into separate function Mark Brown
2019-11-11 14:31   ` Suzuki K Poulose
2019-11-08 17:01 ` [PATCH v8 3/4] arm64: Don't use KPTI where we have E0PD Mark Brown
2019-11-11 14:36   ` Suzuki K Poulose
2019-11-11 16:36     ` Mark Brown
2019-11-11 17:36       ` Suzuki K Poulose
2019-11-08 17:01 ` [PATCH v8 4/4] arm64: Use a variable to store non-global mappings decision Mark Brown
2019-11-11 14:39   ` Suzuki K Poulose

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