[Patch V5 00/16] xen: support pv-domains larger than 512GB

[Juergen Gross]

Support 64 bit pv-domains with more than 512GB of memory.

Following test have been done:
- 64 bit dom0 on 8GB machine
- 64 bit dom0 on 1TB machine (resolving p2m/E820-map conflict)
- 32 bit dom0 on 8GB machine
- 64 bit dom0 on 8GB machine with faked kernel/E820-map conflict
- 64 bit dom0 on 8GB machine with faked pgtable/E820-map conflict
- 64 bit dom0 on 8GB machine with faked initrd/E820-map conflict
- 64 bit dom0 on 8GB machine with faked p2m/E820-map conflict
- 64 bit domU (sizes up to 900GB)
- 32 bit domU

Changes in V5:
- support architectures with undefined KERNEL_PAGE_RO in patch 12
- correct memblock_reserve() area of kernel page tables on 32 bit
- add some more comments in patch 1
- some modifications in patch 13 (memblock_reserve for shared_info removed,
  for xenstore only necessary if not dom0)

Changes in V4:
- new patch 13 (add explicit memblock_reserve() calls for special pages)

Changes in V3:
- rename xen_chk_e820_reserved() to xen_is_e820_reserved() as requested by
  David Vrabel
- add __initdata tag to global variables in patch 10
- move initrd conflict checking after reserving p2m memory (patch 11)

Changes in V2:
- some clarifications and better explanations in commit messages 
- add header changes of include/xen/interface/xen.h (patch 01)
- add wmb() when incrementing p2m_generation (patch 02)
- add new patch 03 (don't build mfn tree if tools don't need it)
- add new patch 06 (split counting of extra memory pages from remapping)
- add new patch 07 (check memory area against e820 map)
- replace early_iounmap() with early_memunmap() (patch 07->patch 08)
- rework patch 09 (check for kernel memory conflicting with memory layout)
- rework patch 10 (check pre-allocated page tables for conflict with memory map)
- combine old patches 08 and 11 into patch 11
- add new patch 12 (provide early_memremap_ro to establish read-only mapping)
- rework old patch 12 (if p2m list located in to be remapped region delay
  remapping) to copy p2m list in case of a conflict (now patch 13)
- correct Kconfig dependency (patch 13->14)
- don't limit dom0 to 512GB (patch 13->14)
- modify parameter parsing to work in very early boot (patch 13->14)
- add new patch 15 to do some cleanup
- remove old patch 05 (simplify xen_set_identity_and_remap() by using global
  variables)
- remove old patch 08 (detect pre-allocated memory interfering with e820 map)


Juergen Gross (16):
  xen: sync with xen headers
  xen: save linear p2m list address in shared info structure
  xen: don't build mfn tree if tools don't need it
  xen: eliminate scalability issues from initial mapping setup
  xen: move static e820 map to global scope
  xen: split counting of extra memory pages from remapping
  xen: check memory area against e820 map
  xen: find unused contiguous memory area
  xen: check for kernel memory conflicting with memory layout
  xen: check pre-allocated page tables for conflict with memory map
  xen: check for initrd conflicting with e820 map
  mm: provide early_memremap_ro to establish read-only mapping
  xen: add explicit memblock_reserve() calls for special pages
  xen: move p2m list if conflicting with e820 map
  xen: allow more than 512 GB of RAM for 64 bit pv-domains
  xen: remove no longer needed p2m.h

 Documentation/kernel-parameters.txt  |   7 +
 arch/x86/include/asm/xen/interface.h |  96 +++++++-
 arch/x86/include/asm/xen/page.h      |   8 +-
 arch/x86/xen/Kconfig                 |  20 +-
 arch/x86/xen/enlighten.c             |   4 +-
 arch/x86/xen/mmu.c                   | 397 ++++++++++++++++++++++++++++++---
 arch/x86/xen/p2m.c                   |  43 +++-
 arch/x86/xen/p2m.h                   |  15 --
 arch/x86/xen/setup.c                 | 414 ++++++++++++++++++++++++++---------
 arch/x86/xen/xen-head.S              |   2 +
 arch/x86/xen/xen-ops.h               |   7 +
 include/asm-generic/early_ioremap.h  |   2 +
 include/asm-generic/fixmap.h         |   3 +
 include/xen/interface/xen.h          |  35 +--
 mm/early_ioremap.c                   |  12 +
 15 files changed, 867 insertions(+), 198 deletions(-)
 delete mode 100644 arch/x86/xen/p2m.h

-- 
2.1.4

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