Add HAX support

I took a stab at trying to rebase/upstream the support for Intel HAXM. (Hardware Accelerated Execution Manager).
Intel HAX is kernel-based hardware acceleration module for Windows and MacOSX.

Another copy of this patchset is available at:
I have made another public copy there:
git://github.com/vpalatin/qemu.git tags/hax-v6-pull-request

https://github.com/vpalatin/qemu/tree/hax-v6-pull-request

I have based my work on the last version of the source code I found:
the emu-2.2-release branch in the external/qemu-android repository as used by the Android emulator.
In patch 2/4, I have forward-ported the core HAX code from there. It has been modified to build and run along with the current code base. It has been simplifying by removing non-UG hardware support / Darwin support / Android-specific leftovers.

This code depends on the new unmapping mechanism and fixes in Intel HAX kernel module. They will publish soon a new version 6.1.0 of the HAX kernel module including the fixes once their QA cycle is completed.
Thanks Yu Ning for making this happen.

In patch 3/4, I have put the plumbing into the QEMU code base, I did some clean up there and it is reasonably intrusive: i.e.

 Makefile.target           |  1 +
 configure                 | 18 ++++++++++++
 cpus.c                    | 74 ++++++++++++++++++++++++++++++++++++++++++++++-
 hw/intc/apic_common.c     |  3 +-
 include/qom/cpu.h         |  5 ++++
 include/sysemu/hw_accel.h |  9 ++++++
 qemu-options.hx           | 11 +++++++
 target/i386/Makefile.objs |  4 +++
 util/qemu-thread-win32.c  |  4 +--
 vl.c                      | 15 ++++++++--
 10 files changed, 137 insertions(+), 7 deletions(-)

The patch 1/4 just extracts from KVM specific header the cpu_synchronize_ functions that HAX is also using.

The patch 4/4 is the Darwin support. This part is only lightly tested for now, so it can be considered as 'experimental'.

I have tested the end result on a Windows 10 Pro machine (with UG support) with the Intel HAXM module dev version and a large ChromiumOS x86_64 image to exercise various code paths. It looks stable.
I also did a quick regression testing of the integration by running a Linux build with KVM enabled.

Changes from v5 to v6:
- rebase against new upstream target directories changes
- rebase on top of Paolo's ramblock-notifier patch and use the new API.
- adjust qemu_cpu_kick according to Paolo's suggestions / use QueueUserApc.

Changes from v4 to v5:
- update HAX fastmmio API with the new MMIO to MMIO transfer.

Changes from v3 to v4:
- add RAM unmapping in the MemoryListener thanks to new API in HAX module 6.1.0 and re-wrote the memory mappings management to deal with this.
- marked no longer used MMIO emulation as unsupported.
- clean-up a few left-overs from removed code.
- re-add an experimental version of the Darwin support.

Changes from v2 to v3:
- fix saving/restoring FPU registers as suggested by Paolo.
- fix Windows build on all targets as contributed by Stefan Weil.
- clean-up IO / MMIO emulation.
- more clean-up of emulation leftovers.

Changes from v1 to v2:
- fix all style issues in the original code to get it through checkpatch.pl.
- remove Darwin support, it was barely tested and not fully functional.
- remove the support for CPU without UG mode.
- fix most review comments

Vincent Palatin (4):
kvm: move cpu synchronization code target/i386: Add Intel HAX files
Plumb the HAXM-based hardware acceleration support
hax: add Darwin support

 Makefile.target             |    1 +
 configure                   |   18 +
 cpus.c                      |   79 ++-
 gdbstub.c                   |    1 +
 hax-stub.c                  |   39 ++
 hw/i386/kvm/apic.c          |    1 +
 hw/i386/kvmvapic.c          |    1 +
 hw/intc/apic_common.c       |    3 +-
 hw/misc/vmport.c            |    2 +-
 hw/ppc/pnv_xscom.c          |    2 +-
 hw/ppc/ppce500_spin.c       |    4 +-
 hw/ppc/spapr.c              |    2 +-
 hw/ppc/spapr_hcall.c        |    2 +-
 hw/s390x/s390-pci-inst.c    |    1 +
 include/qom/cpu.h           |    5 +
 include/sysemu/hax.h        |   56 +++
 include/sysemu/hw_accel.h   |   48 ++
 include/sysemu/kvm.h        |   23 -
 monitor.c                   |    2 +-
 qemu-options.hx             |   11 +
 qom/cpu.c                   |    2 +-
 target/arm/cpu.c            |    2 +-
 target/i386/Makefile.objs   |    7 +
 target/i386/hax-all.c       | 1155 +++++++++++++++++++++++++++++++++++++++++++
 target/i386/hax-darwin.c    |  316 ++++++++++++
 target/i386/hax-darwin.h    |   63 +++
 target/i386/hax-i386.h      |   94 ++++
 target/i386/hax-interface.h |  361 ++++++++++++++
 target/i386/hax-mem.c       |  289 +++++++++++
 target/i386/hax-windows.c   |  479 ++++++++++++++++++
 target/i386/hax-windows.h   |   89 ++++
 target/i386/helper.c        |    1 +
 target/i386/kvm.c           |    1 +
 target/ppc/mmu-hash64.c     |    2 +-
 target/ppc/translate_init.c |    2 +-
 target/s390x/gdbstub.c      |    1 +
 util/qemu-thread-win32.c    |    4 +-
 vl.c                        |   15 +-
 38 files changed, 3143 insertions(+), 41 deletions(-)
 create mode 100644 hax-stub.c
 create mode 100644 include/sysemu/hax.h
 create mode 100644 include/sysemu/hw_accel.h
 create mode 100644 target/i386/hax-all.c
 create mode 100644 target/i386/hax-darwin.c
 create mode 100644 target/i386/hax-darwin.h
 create mode 100644 target/i386/hax-i386.h
 create mode 100644 target/i386/hax-interface.h
 create mode 100644 target/i386/hax-mem.c
 create mode 100644 target/i386/hax-windows.c
 create mode 100644 target/i386/hax-windows.h

2.11.0.390.gc69c2f50cf-goog