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

From: Juergen Gross
Date: Thu Apr 09 2015 - 02:56:07 EST

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
- 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


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