[Xen-devel] [Patch V2 00/15] xen: support pv-domains larger than 512GB

[Juergen Gross <jgross@xxxxxxxx>]

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

Tested with 64 bit dom0 on machines with 8GB and 1TB and 32 bit dom0 on a
8GB machine. Conflicts between E820 map and different hypervisor populated
memory areas have been tested via a fake E820 map reserved area on the
8GB machine.

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 (15):
  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: 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/mmu.c                   | 367 +++++++++++++++++++++++++++++--
 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               |   6 +
 include/asm-generic/early_ioremap.h  |   2 +
 include/asm-generic/fixmap.h         |   3 +
 include/xen/interface/xen.h          |  10 +-
 mm/early_ioremap.c                   |  11 +
 14 files changed, 822 insertions(+), 182 deletions(-)
 delete mode 100644 arch/x86/xen/p2m.h

-- 
2.1.4


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