[PATCH v3 0/2] KVM: s390: fix storage attributes migration

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This patchset fixes the migration of storage attributes.

Each memory slot has a bitmap, with 2 bits per page, used to keep track
of dirty pages during migration. We only use one bit, the other would be
wasted. With this patch, the second bit is now used to keep track of
dirty storage attributes. This means that we do not need anymore to
allocate and manage the additional bitmap, and no extra work is needed
to keep track of memory slots. The code does get a little bit more
complicated when accounting for the memory slots, but overall it should
be more robust.

The first patch simply introduces two auxiliary functions, while the
second patch does the actual job.

v2 -> v3
* rebased on master
* fix comment for gfn_to_memslot_approx
* cmma_bitmap renamed to kvm_shadow_dirty_bitmap and easier to read
* kvm->arch.migration_mode is not atomic any longer
* renamed some local variables for more consistency

v1 -> v2
* renamed _cmma_bitmap to cmma_bitmap and moved it to kvm-s390.h
* renamed and/or removed some variables to improve readability
* added some comments inline
* simplified the code flow to improve readability

Claudio Imbrenda (2):
  KVM: s390x: some utility functions for migration
  KVM: s390: Fix storage attributes migration with memory slots

 arch/s390/include/asm/kvm_host.h |   9 +-
 arch/s390/kvm/kvm-s390.c         | 303 +++++++++++++++++++++++----------------
 arch/s390/kvm/kvm-s390.h         |   7 +
 arch/s390/kvm/priv.c             |  28 ++--
 include/linux/kvm_host.h         |   7 +
 virt/kvm/kvm_main.c              |   2 +-
 6 files changed, 219 insertions(+), 137 deletions(-)

-- 
2.7.4




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