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[v3,0/2] arm64: apply G-to-nG conversion for KPTI with MMU enabled

Message ID 20220421140339.1329019-1-ardb@kernel.org (mailing list archive)
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Series arm64: apply G-to-nG conversion for KPTI with MMU enabled | expand

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Ard Biesheuvel April 21, 2022, 2:03 p.m. UTC 
This v3 is now a series, after I split off some preparatory refactoring
into a separate patch. Rationale for the series is in patch #2.

Changes since v2 [0]:
- reinstate optimization that avoids descending into the same page
  tables repeatedly when KASAN is enabled;
- use broadcast TLB maintenance when doing BBM for the temporary
  mappings, to prevent potential TLB conflicts on the secondary cores
  that are running from the same set of temporary page tables;
- remove a wait loop in the C code, by using 'num_cpus + 1' as the
  signal value rather then 0x0;
- declutter and simplify the asm helper code, to make it more
  maintainable.

Cc: will@kernel.org
Cc: maz@kernel.org
Cc: mark.rutland@arm.com
Cc: catalin.marinas@arm.com
Cc: keescook@chromium.org

[0] https://lore.kernel.org/linux-arm-kernel/20220413121848.787565-1-ardb@kernel.org/

Ard Biesheuvel (2):
  arm64: kpti-ng: simplify page table traversal logic
  arm64: mm: install KPTI nG mappings with MMU enabled

 arch/arm64/include/asm/mmu.h   |   4 +
 arch/arm64/kernel/cpufeature.c |  65 ++++++-
 arch/arm64/mm/mmu.c            |   8 +-
 arch/arm64/mm/proc.S           | 190 ++++++++++----------
 4 files changed, 161 insertions(+), 106 deletions(-)