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linux-stable/arch/x86/mm
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Thomas Gleixner 9cc9f17a5a x86/mm/cpa: Do the range check early 
To avoid excessive 4k wise checks in the common case do a quick check first
whether the requested new page protections conflict with a static
protection area in the large page. If there is no conflict then the
decision whether to preserve or to split the page can be made immediately.

If the requested range covers the full large page, preserve it. Otherwise
split it up. No point in doing a slow crawl in 4k steps.

Before:

 1G pages checked:                    2
 1G pages sameprot:                   0
 1G pages preserved:                  0
 2M pages checked:                  538
 2M pages sameprot:                 466
 2M pages preserved:                 47
 4K pages checked:               560642
 4K pages set-checked:             7668

After:

 1G pages checked:                    2
 1G pages sameprot:                   0
 1G pages preserved:                  0
 2M pages checked:                  541
 2M pages sameprot:                 466
 2M pages preserved:                 47
 4K pages checked:                  514
 4K pages set-checked:             7668

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Dave Hansen <dave.hansen@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Bin Yang <bin.yang@intel.com>
Cc: Mark Gross <mark.gross@intel.com>
Link: https://lkml.kernel.org/r/20180917143546.507259989@linutronix.de
2018-09-27 20:39:39 +02:00
..
amdtopology.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu_entry_area.c x86: Add entry trampolines to kcore 2018-08-14 19:13:26 -03:00
debug_pagetables.c x86/efi: Replace efi_pgd with efi_mm.pgd 2018-03-12 11:05:05 +01:00
dump_pagetables.c x86/mm/pti: Move user W+X check into pti_finalize() 2018-08-10 21:12:45 +02:00
extable.c x86/extable: Mark exception handler functions visible 2018-01-14 20:04:16 +01:00
fault.c x86/dumpstack: Don't dump kernel memory based on usermode RIP 2018-08-31 17:08:22 +02:00
highmem_32.c
hugetlbpage.c x86/mm: Prevent non-MAP_FIXED mapping across DEFAULT_MAP_WINDOW border 2017-11-16 11:43:11 +01:00
ident_map.c x86/mm: Stop pretending pgtable_l5_enabled is a variable 2018-05-19 11:56:57 +02:00
init.c x86/mm: Add .bss..decrypted section to hold shared variables 2018-09-15 20:48:45 +02:00
init_32.c x86/mm/init32: Mark text and rodata RO in one go 2018-09-27 20:39:37 +02:00
init_64.c Merge branch 'x86/pti-urgent' into x86/pti 2018-08-06 20:56:34 +02:00
iomap_32.c x86/mm: Do not auto-massage page protections 2018-04-12 09:04:22 +02:00
ioremap.c x86/mm: Do not auto-massage page protections 2018-04-12 09:04:22 +02:00
kasan_init_64.c x86/mm: Stop pretending pgtable_l5_enabled is a variable 2018-05-19 11:56:57 +02:00
kaslr.c x86/mm: Stop pretending pgtable_l5_enabled is a variable 2018-05-19 11:56:57 +02:00
kmmio.c x86/mm/kmmio: Make the tracer robust against L1TF 2018-08-08 22:28:34 +02:00
Makefile x86/mm/sme: Disable stack protection for mem_encrypt_identity.c 2018-02-28 15:24:12 +01:00
mem_encrypt.c x86/mm: Add .bss..decrypted section to hold shared variables 2018-09-15 20:48:45 +02:00
mem_encrypt_boot.S x86/mm/sme, objtool: Annotate indirect call in sme_encrypt_execute() 2018-02-21 09:05:04 +01:00
mem_encrypt_identity.c x86/mm: Decouple dynamic __PHYSICAL_MASK from AMD SME 2018-06-06 13:38:01 +02:00
mm_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmap.c x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM 2018-08-24 09:51:14 +02:00
mmio-mod.c x86: do not use print_symbol() 2018-01-05 15:23:01 +01:00
mpx.c Merge branch 'x86/mpx' into x86/asm, to pick up dependent commits 2017-11-08 10:55:48 +01:00
numa.c x86: Remove pr_fmt duplicate logging prefixes 2018-05-13 21:25:18 +02:00
numa_32.c x86/mm/32: Remove unused node_memmap_size_bytes() & CONFIG_NEED_NODE_MEMMAP_SIZE logic 2018-03-27 08:45:02 +02:00
numa_64.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
numa_emulation.c x86/numa_emulation: Introduce uniform split capability 2018-07-06 18:48:58 +02:00
numa_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pageattr-test.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pageattr.c x86/mm/cpa: Do the range check early 2018-09-27 20:39:39 +02:00
pat.c x86/mm/pat: Prepare {reserve, free}_memtype() for "decoy" addresses 2018-08-20 09:22:45 -07:00
pat_internal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pat_rbtree.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pf_in.c
pf_in.h
pgtable.c x86/mm: Expand static page table for fixmap space 2018-09-20 23:17:22 +02:00
pgtable_32.c x86/mm: Rename flush_tlb_single() and flush_tlb_one() to __flush_tlb_one_[user|kernel]() 2018-02-15 01:15:52 +01:00
physaddr.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
physaddr.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pkeys.c x86/pkeys: Override pkey when moving away from PROT_EXEC 2018-05-14 11:14:45 +02:00
pti.c x86/pti: Fix section mismatch warning/error 2018-09-02 11:24:41 +02:00
setup_nx.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
srat.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
testmmiotrace.c Annotate hardware config module parameters in arch/x86/mm/ 2017-04-04 16:54:21 +01:00
tlb.c x86/nmi: Fix NMI uaccess race against CR3 switching 2018-08-31 17:08:22 +02:00