[RFC v4][PATCH part-2 00/13] ASI - Part II (Decorated Page-Table)

[Alexandre Chartre <alexandre.chartre@oracle.com>]

This is part II of ASI RFC v4. Please refer to the cover letter of
part I for an overview the ASI RFC.

  https://lore.kernel.org/lkml/20200504144939.11318-1-alexandre.chartre@oracle.com/

This part introduces decorated page-table which encapsulate native page
table (e.g. a PGD) in order to provide convenient page-table management
functions, such as tracking address range mapped in a page-table or
safely handling references to another page-table.

Decorated page-table can then be used to easily create and manage page
tables to be used with ASI. It will be used by the ASI test driver (see
part III) and later by KVM ASI.

Decorated page-table is independent of ASI, and can potentially be used
anywhere a page-table is needed.

Thanks,

alex.

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Alexandre Chartre (13):
  mm/x86: Introduce decorated page-table (dpt)
  mm/dpt: Track buffers allocated for a decorated page-table
  mm/dpt: Add decorated page-table entry offset functions
  mm/dpt: Add decorated page-table entry allocation functions
  mm/dpt: Add decorated page-table entry set functions
  mm/dpt: Functions to populate a decorated page-table from a VA range
  mm/dpt: Helper functions to map module into a decorated page-table
  mm/dpt: Keep track of VA ranges mapped in a decorated page-table
  mm/dpt: Functions to clear decorated page-table entries for a VA range
  mm/dpt: Function to copy page-table entries for percpu buffer
  mm/dpt: Add decorated page-table remap function
  mm/dpt: Handle decorated page-table mapped range leaks and overlaps
  mm/asi: Function to init decorated page-table with ASI core mappings

 arch/x86/include/asm/asi.h |    2 +
 arch/x86/include/asm/dpt.h |   89 +++
 arch/x86/mm/Makefile       |    2 +-
 arch/x86/mm/asi.c          |   57 ++
 arch/x86/mm/dpt.c          | 1051 ++++++++++++++++++++++++++++++++++++
 5 files changed, 1200 insertions(+), 1 deletion(-)
 create mode 100644 arch/x86/include/asm/dpt.h
 create mode 100644 arch/x86/mm/dpt.c

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