[PATCH RFC 0/4] arm: regarding live migration

[Jaeyong Yoo <jaeyong.yoo@samsung.com>]

Hi all,
I'm interested in developing live migration in xen arm and possibly 
the contribution to the community and I hope this patch series could be a start.

For this matter, I have following questions:

(1) Is it OK to keep using the keyword "hvm"? Or, is it better to use pvh?

(2) After some overview of source code, I think the required parts
   for save/restore are the following:
      - xen-store info
      - shared info page
      - memory contents (no need for p2m table)
      - cpu/vcpu 
      - gic/vgic
      - drivers
   I think there are still important parts that I'm missing.
   I appreciate if you could give some advice :)

(3) Regarding split drivers, come to think of it, we have to store 
   both side (front/back) states, in-flight event channels, IRQs, etc.
   And those look like quite a work (although evtchn is migrated within vcpu)
   I appreciate  if you guys could share any hints from the experience of 
   migrating split drivers in x86.

Lastly I would like to note that the following patch series is just the 
concept work for reviewing my idea and they are quite preliminary.


Jaeyong Yoo (4):
  Create new directory for stroing hvm-related files in ARM.
  Implement arch_hvm_save and arch_hvm_load functions
  Implement save and restore for gic (template impl)
  Implement XEN_DOMCTL_gethvmcontext part of arch_do_domctl

 xen/arch/arm/Makefile                  |    2 +-
 xen/arch/arm/domctl.c                  |   58 +++++++++++++++-
 xen/arch/arm/hvm.c                     |   67 ------------------
 xen/arch/arm/hvm/Makefile              |    2 +
 xen/arch/arm/hvm/hvm.c                 |  118 ++++++++++++++++++++++++++++++++
 xen/arch/arm/hvm/save.c                |   69 +++++++++++++++++++
 xen/common/Makefile                    |    2 +
 xen/include/asm-arm/hvm/support.h      |   29 ++++++++
 xen/include/public/arch-arm/hvm/save.h |   36 ++++++++++
 9 files changed, 314 insertions(+), 69 deletions(-)
 delete mode 100644 xen/arch/arm/hvm.c
 create mode 100644 xen/arch/arm/hvm/Makefile
 create mode 100644 xen/arch/arm/hvm/hvm.c
 create mode 100644 xen/arch/arm/hvm/save.c
 create mode 100644 xen/include/asm-arm/hvm/support.h

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1.7.9.5