arm64: some 52-bit cleanups
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- v1 Latest5 patches 7 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/5 | arm64: mm: use a 48-bit ID map when possible on 52-bit VA buildsarch/ arch/ arch/ | +3 | 2 replies | |
| 2/5 | arm64: mm: remove unused __cpu_uses_extended_idmap[_level()]arch/ | +0 | 0 replies | |
| 3/5 | arm64: mm: use a compile time constant for vabits_actual when possiblearch/ arch/ arch/ | +12 | 4 replies | |
| 4/5 | arm64: mm: get rid of idmap_ptrs_per_pgd handlingarch/ arch/ arch/ | +1 | 0 replies | |
| 5/5 | arm64: mm: switch to 52-bit ID map on 52-bit VA capable systemsarch/ | +4 | 0 replies |
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Cover letter [PATCH 0/5] arm64: some 52-bit cleanups
This work was triggered by Mark Salter's report about a regression regarding the programmed size of the ID map page tables.
The first patch switches the early ID map population code to default to a 48-bit range on kernels built with 52-bit VA support, and only switch to 52-bit if the placement of the kernel requires it. This should address the regressions reported by Mark. This patch should be suitable for being backported to -stable.
The remaining patches are cleanups that remove and/or simplify the 52-bit VA support, and disable some parts in configurations that don't need it.
Patch #5 adds back the logic to use a 52-bit VA ID map on 52-bit VA capable hardware, which we might consider if it is worthwhile for some reason to elide the TCR_EL1 updates that result from having ID map and user space VA ranges of different size.
Ard Biesheuvel (5):
arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds
arm64: mm: remove unused __cpu_uses_extended_idmap[_level()]
arm64: mm: use a compile time constant for vabits_actual when possible
arm64: mm: get rid of idmap_ptrs_per_pgd handling
arm64: mm: switch to 52-bit ID map on 52-bit VA capable systems
arch/arm64/include/asm/memory.h | 4 +++ arch/arm64/include/asm/mmu_context.h | 18 -------------- arch/arm64/kernel/head.S | 26 +++++++++----------- arch/arm64/mm/mmu.c | 5 ++-- 4 files changed, 18 insertions(+), 35 deletions(-)
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