linux/drivers/nvdimm
Linus Torvalds 2923b27e54 libnvdimm-for-4.19_dax-memory-failure
* memory_failure() gets confused by dev_pagemap backed mappings. The
   recovery code has specific enabling for several possible page states
   that needs new enabling to handle poison in dax mappings. Teach
   memory_failure() about ZONE_DEVICE pages.
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Merge tag 'libnvdimm-for-4.19_dax-memory-failure' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm

Pull libnvdimm memory-failure update from Dave Jiang:
 "As it stands, memory_failure() gets thoroughly confused by dev_pagemap
  backed mappings. The recovery code has specific enabling for several
  possible page states and needs new enabling to handle poison in dax
  mappings.

  In order to support reliable reverse mapping of user space addresses:

   1/ Add new locking in the memory_failure() rmap path to prevent races
      that would typically be handled by the page lock.

   2/ Since dev_pagemap pages are hidden from the page allocator and the
      "compound page" accounting machinery, add a mechanism to determine
      the size of the mapping that encompasses a given poisoned pfn.

   3/ Given pmem errors can be repaired, change the speculatively
      accessed poison protection, mce_unmap_kpfn(), to be reversible and
      otherwise allow ongoing access from the kernel.

  A side effect of this enabling is that MADV_HWPOISON becomes usable
  for dax mappings, however the primary motivation is to allow the
  system to survive userspace consumption of hardware-poison via dax.
  Specifically the current behavior is:

     mce: Uncorrected hardware memory error in user-access at af34214200
     {1}[Hardware Error]: It has been corrected by h/w and requires no further action
     mce: [Hardware Error]: Machine check events logged
     {1}[Hardware Error]: event severity: corrected
     Memory failure: 0xaf34214: reserved kernel page still referenced by 1 users
     [..]
     Memory failure: 0xaf34214: recovery action for reserved kernel page: Failed
     mce: Memory error not recovered
     <reboot>

  ...and with these changes:

     Injecting memory failure for pfn 0x20cb00 at process virtual address 0x7f763dd00000
     Memory failure: 0x20cb00: Killing dax-pmd:5421 due to hardware memory corruption
     Memory failure: 0x20cb00: recovery action for dax page: Recovered

  Given all the cross dependencies I propose taking this through
  nvdimm.git with acks from Naoya, x86/core, x86/RAS, and of course dax
  folks"

* tag 'libnvdimm-for-4.19_dax-memory-failure' of gitolite.kernel.org:pub/scm/linux/kernel/git/nvdimm/nvdimm:
  libnvdimm, pmem: Restore page attributes when clearing errors
  x86/memory_failure: Introduce {set, clear}_mce_nospec()
  x86/mm/pat: Prepare {reserve, free}_memtype() for "decoy" addresses
  mm, memory_failure: Teach memory_failure() about dev_pagemap pages
  filesystem-dax: Introduce dax_lock_mapping_entry()
  mm, memory_failure: Collect mapping size in collect_procs()
  mm, madvise_inject_error: Let memory_failure() optionally take a page reference
  mm, dev_pagemap: Do not clear ->mapping on final put
  mm, madvise_inject_error: Disable MADV_SOFT_OFFLINE for ZONE_DEVICE pages
  filesystem-dax: Set page->index
  device-dax: Set page->index
  device-dax: Enable page_mapping()
  device-dax: Convert to vmf_insert_mixed and vm_fault_t
2018-08-25 18:43:59 -07:00
..
Kconfig Revert "libnvdimm, of_pmem: workaround OF_NUMA=n build error" 2018-04-19 15:10:56 -07:00
Makefile libnvdimm: Add device-tree based driver 2018-04-07 07:53:23 -07:00
badrange.c libnvdimm, badrange: remove a WARN for list_empty 2017-11-02 10:42:30 -07:00
blk.c for-4.17/block-20180402 2018-04-05 14:27:02 -07:00
btt.c block: make bdev_ops->rw_page() take a REQ_OP instead of bool 2018-07-18 08:44:14 -06:00
btt.h libnvdimm, btt: Fix an incompatibility in the log layout 2017-12-21 14:59:27 -08:00
btt_devs.c libnvdimm: remove redundant __func__ in dev_dbg 2018-03-06 08:44:17 -08:00
bus.c libnvdimm: fix ars_status output length calculation 2018-08-20 08:56:38 -07:00
claim.c libnvdimm, pmem: Fix memcpy_mcsafe() return code handling in nsio_rw_bytes() 2018-06-28 18:21:30 -07:00
core.c libnvdimm: remove redundant __func__ in dev_dbg 2018-03-06 08:44:17 -08:00
dax_devs.c libnvdimm: remove redundant __func__ in dev_dbg 2018-03-06 08:44:17 -08:00
dimm.c libnvdimm: Introduce locked DIMM capacity support 2018-07-14 10:27:00 -07:00
dimm_devs.c libnvdimm: Use max contiguous area for namespace size 2018-07-25 14:11:09 -07:00
e820.c libnvdimm, e820: Register all pmem resources 2018-06-02 17:05:43 -07:00
label.c libnvdimm, label: change nvdimm_num_label_slots per UEFI 2.7 2018-03-15 13:59:57 -07:00
label.h libnvdimm, label: change min label storage size per UEFI 2.7 2018-03-15 10:44:32 -07:00
namespace_devs.c libnvdimm: Use max contiguous area for namespace size 2018-07-25 14:11:09 -07:00
nd-core.h libnvdimm: Use max contiguous area for namespace size 2018-07-25 14:11:09 -07:00
nd.h libnvdimm-for-4.19_misc 2018-08-25 18:13:10 -07:00
of_pmem.c libnvdimm, of_pmem: use dev_to_node() instead of of_node_to_nid() 2018-04-19 15:07:10 -07:00
pfn.h libnvdimm, dax: autodetect support 2016-05-20 22:02:57 -07:00
pfn_devs.c mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS 2018-05-22 06:59:39 -07:00
pmem.c libnvdimm-for-4.19_dax-memory-failure 2018-08-25 18:43:59 -07:00
pmem.h libnvdimm, pmem: Restore page attributes when clearing errors 2018-08-20 09:22:45 -07:00
region.c libnvdimm, region: quiet region probe 2018-04-07 07:47:10 -07:00
region_devs.c libnvdimm: Export max available extent 2018-07-25 14:11:43 -07:00