[PATCH v6 0/4] live migration dirty bitmap support for ARMv7

[Mario Smarduch]

This is v6 patcheset of live mgiration support for ARMv7.

- Tested on two 4-way A15 hardware, QEMU 2-way/4-way SMP guest upto 2GB
- Various dirty data rates tested - 2GB/1s ... 2048 pgs/5ms
- validated source/destination memory image integrity

Changes since v1:
- add unlock of VM mmu_lock to prevent a deadlock
- moved migratiion active inside mmu_lock acquire for visibility in 2nd stage
  data abort handler
- Added comments

Changes since v2: 
- move initial VM write protect to memory region architecture prepare function
  (needed to make dirty logging function generic) 
- added stage2_mark_pte_ro() - to mark ptes ro - Marc's comment
- optimized initial VM memory region write protect to do fewer table lookups -
  applied Marc's comment for walking dirty bitmap mask
- added pud_addr_end() for stage2 tables, to make the walk 4-level
- added kvm_flush_remote_tlbs() to use ARM TLB invalidation, made the generic
  one weak, Marc's comment to for generic dirty bitmap log function
- optimized walking dirty bit map mask to skip upper tables - Marc's comment
- deleted x86,arm kvm_vm_ioctl_get_dirty_log(), moved to kvm_main.c tagged 
  the function weak - Marc's comment
- changed Data Abort handler pte index handling - Marc's comment

Changes since v3:
- changed pte updates to reset write bit instead of setting default 
  value for existing pte's - Steve's comment
- In addition to PUD add 2nd stage >4GB range functions - Steves
  suggestion
- Restructured initial memory slot write protect function for PGD, PUD, PMD
  table walking - Steves suggestion
- Renamed variable types to resemble their use - Steves suggestions
- Added couple pte helpers for 2nd stage tables - Steves suggestion
- Updated unmap_range() that handles 2nd stage tables and identity mappings
  to handle 2nd stage addresses >4GB. Left ARMv8 unchanged.

Changes since v4:
- rebased to 3.15.0-rc1 - 'next' to pickup p*addr_end patches - Gavins comment
- Update PUD address end function to support 4-level page table walk
- Elimiated 5th patch of the series that fixed unmap_range(), since it was
  fixed by Marcs patches.

Changes since v5:
- Created seperate entry point for VMID TLB flush with no param - Christoffers
  comment
- Update documentation for kvm_flush_remote_tlbs() - Christoffers comment
- Simplified splitting of huge pages - inittial WP and 2nd stage DABT handler
  clear the huge page PMD, and use current code to fault in small pages.
  Removed kvm_split_pmd().

Mario Smarduch (4):
  add ARMv7 HYP API to flush VM TLBs without address param
  live migration support for initial write protect of VM
  live migration support for VM dirty log management
  add 2nd stage page fault handling during live migration

 arch/arm/include/asm/kvm_asm.h  |    1 +
 arch/arm/include/asm/kvm_host.h |   11 ++
 arch/arm/include/asm/kvm_mmu.h  |   10 ++
 arch/arm/kvm/arm.c              |    8 +-
 arch/arm/kvm/interrupts.S       |   11 ++
 arch/arm/kvm/mmu.c              |  292 ++++++++++++++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c              |   86 ------------
 virt/kvm/kvm_main.c             |   84 ++++++++++-
 8 files changed, 409 insertions(+), 94 deletions(-)

-- 
1.7.9.5