This is a revision of Chris and Jordan's series to introduce a per-cpu temporary
mm to be used for patching with strict rwx on radix mmus.
v10: * Don't set poking_init_enabled on boot CPU init failure
* Remove extern from functions in files touched by this series
* Changed book3s/32/tlbflush.h stub body from warning to build bug
* Remove empty hash__ set of functions. Also removed the ones that are
just warnings (would have preferred to make them build bugs, but they
blocked the build even though it's all inline inside a radix_enabled()
if-block).
- It's not possible to use the radix specific necessary TLB
flush
in code patching, as code-patching.c is compiled even when
radix__*
functions aren't visible. #ifdefs would be required.
The cxl usage required radix__* be visible anyway, so there
is no
compile issue.
* Mention cache benefits of struct of patching context variables
* Don't open-code mm init and teardown. It seems tlb_gather_mmu does
the necessary steps to detect page table pages to free, so it should
not leak. get_locked_pte() is used over __get_locked_pte() because I
don't know what makes the double-underscore function dangerous.
Previous versions:
v9: https://lore.kernel.org/all/20221025044409.448755-1-bg...@linux.ibm.com/
v8: https://lore.kernel.org/all/20221021052238.580986-1-bg...@linux.ibm.com/
v7: https://lore.kernel.org/all/20211110003717.1150965-1-jniet...@gmail.com/
v6: https://lore.kernel.org/all/20210911022904.30962-1-...@bluescreens.de/
v5: https://lore.kernel.org/all/20210713053113.4632-1-...@linux.ibm.com/
v4: https://lore.kernel.org/all/20210429072057.8870-1-...@bluescreens.de/
v3: https://lore.kernel.org/all/20200827052659.24922-1-...@codefail.de/
v2: https://lore.kernel.org/all/20200709040316.12789-1-...@informatik.wtf/
v1: https://lore.kernel.org/all/20200603051912.23296-1-...@informatik.wtf/
RFC: https://lore.kernel.org/all/20200323045205.20314-1-...@informatik.wtf/
x86:
https://lore.kernel.org/kernel-hardening/20190426232303.28381-1-nadav.a...@gmail.com/
Benjamin Gray (9):
powerpc: Allow clearing and restoring registers independent of saved
breakpoint state
powerpc/code-patching: Use WARN_ON and fix check in poking_init
powerpc/mm: Remove extern from function prototypes
powerpc/mm: Remove empty hash__ functions
cxl: Use radix__flush_all_mm instead of generic flush_all_mm
powerpc/mm: Remove flush_all_mm, local_flush_all_mm
powerpc/tlb: Add local flush for page given mm_struct and psize
powerpc/code-patching: Use temporary mm for Radix MMU
powerpc/code-patching: Consolidate and cache per-cpu patching context
arch/powerpc/include/asm/book3s/32/tlbflush.h | 9 +
.../include/asm/book3s/64/tlbflush-hash.h | 69 +-----
arch/powerpc/include/asm/book3s/64/tlbflush.h | 41 +---
arch/powerpc/include/asm/debug.h | 2 +
arch/powerpc/include/asm/mmu_context.h | 6 +-
arch/powerpc/include/asm/nohash/tlbflush.h | 27 ++-
arch/powerpc/kernel/process.c | 38 +++-
arch/powerpc/lib/code-patching.c | 207 ++++++++++++++++--
arch/powerpc/mm/nohash/tlb.c | 8 +
9 files changed, 287 insertions(+), 120 deletions(-)
base-commit: 247f34f7b80357943234f93f247a1ae6b6c3a740
--
2.38.1
