pv event interface between host and guest

This series implements a new interface, kvm pv event, to notify host when
some events happen in guest. Right now there is one supported event: guest
panic.

Also, the cpu runstate is preserved during save/load vm and migration. Thus,
if vm is panicked during migration, we can still know it by quring the status
of vm in destination host when migration completes.

v12: http://lists.nongnu.org/archive/html/qemu-devel/2013-01/m...

changes from v12:
  - no DO_UPCASE
  - the interface is only for x86 now
  - request 4 bytes io range(hw/kvm_pv_event.c)
  - rebase to the latest tree

Hu Tao (7):
  save/load cpu runstate
  update kernel headers
  add a new runstate: RUN_STATE_GUEST_PANICKED
  add a new qevent: QEVENT_GUEST_PANICKED
  introduce a new qom device to deal with panicked event
  allower the user to disable pv event support
  pv event: add document to describe the usage

Wen Congyang (1):
  start vm after resetting it

 docs/pv-event.txt                |  17 ++++
 hw/kvm/Makefile.objs             |   2 +-
 hw/kvm/pv_event.c                | 198 +++++++++++++++++++++++++++++++++++++++
 hw/pc_piix.c                     |  12 +++
 include/block/block.h            |   2 +
 include/monitor/monitor.h        |   1 +
 include/sysemu/kvm.h             |   2 +
 include/sysemu/sysemu.h          |   2 +
 kvm-stub.c                       |   4 +
 linux-headers/asm-x86/kvm_para.h |   1 +
 linux-headers/linux/kvm_para.h   |   6 ++
 migration.c                      |   7 +-
 monitor.c                        |   6 +-
 qapi-schema.json                 |   6 +-
 qemu-options.hx                  |   3 +-
 qmp.c                            |   5 +-
 savevm.c                         |   1 +
 vl.c                             |  56 ++++++++++-
 18 files changed, 314 insertions(+), 17 deletions(-)
 create mode 100644 docs/pv-event.txt
 create mode 100644 hw/kvm/pv_event.c

-- 
1.8.1.4