AuxXxilium/linux_dsm_epyc7002
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164477c233
linux_dsm_epyc7002/arch/x86/mm
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Dave Hansen 164477c233 x86/mm: Clarify hardware vs. software "error_code" 
We pass around a variable called "error_code" all around the page
fault code.  Sounds simple enough, especially since "error_code" looks
like it exactly matches the values that the hardware gives us on the
stack to report the page fault error code (PFEC in SDM parlance).

But, that's not how it works.

For part of the page fault handler, "error_code" does exactly match
PFEC.  But, during later parts, it diverges and starts to mean
something a bit different.

Give it two names for its two jobs.

The place it diverges is also really screwy.  It's only in a spot
where the hardware tells us we have kernel-mode access that occurred
while we were in usermode accessing user-controlled address space.
Add a warning in there.

Cc: x86@kernel.org
Cc: Jann Horn <jannh@google.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180928160220.4A2272C9@viggo.jf.intel.com
2018-10-09 16:51:15 +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/mm: Fix typo in comment 2018-10-03 16:14:05 +02:00
fault.c x86/mm: Clarify hardware vs. software "error_code" 2018-10-09 16:51:15 +02:00
highmem_32.c x86/mm: Audit and remove any unnecessary uses of module.h 2016-07-14 13:04:20 +02:00
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_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
init.c x86/mm: Add .bss..decrypted section to hold shared variables 2018-09-15 20:48:45 +02:00
iomap_32.c x86/mm: Do not auto-massage page protections 2018-04-12 09:04:22 +02:00
ioremap.c x86/ioremap: Add an ioremap_encrypted() helper 2018-10-06 11:57:51 +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_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
mem_encrypt.c x86/mm: Add .bss..decrypted section to hold shared variables 2018-09-15 20:48:45 +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_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
numa.c x86: Remove pr_fmt duplicate logging prefixes 2018-05-13 21:25:18 +02:00
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: Optimize __cpa_flush_range() 2018-09-27 20:39:42 +02:00
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
pat.c x86/mm/pat: Prepare {reserve, free}_memtype() for "decoy" addresses 2018-08-20 09:22:45 -07:00
pf_in.c x86/mm: Audit and remove any unnecessary uses of module.h 2016-07-14 13:04:20 +02:00
pf_in.h x86 mmiotrace: move files into arch/x86/mm/. 2008-05-24 11:25:37 +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
pgtable.c x86/mm: Expand static page table for fixmap space 2018-09-20 23:17:22 +02:00
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/mm/tlb: Make lazy TLB mode lazier 2018-10-09 16:51:12 +02:00