[Qemu-devel] [PATCH v2 0/5] [RFC] Add HAX support

[Vincent Palatin <vpalatin@chromium.org>]

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.

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 2/5, I have forward-ported the core HAX code mostly unmodified from
there, I just did some minor touch up to make it build and run properly,
and fixed the style issues to go through checkpatch.pl.
I have not included the Darwin support.
It might contain some outdated constructs and probably requires more
attention (thus the 'RFC' for this patchset).

In patch 3/5, I'm removing a good chunk of the support for CPUs without UG mode
as advised by Paolo to simplify the initial version.

In patch 5/5, 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                    | 87 ++++++++++++++++++++++++++++++++++++++++++++++-
 exec.c                    | 16 +++++++++
 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 |  7 ++++
 vl.c                      | 15 ++++++--
 10 files changed, 167 insertions(+), 5 deletions(-)

The qemu_cpu_kick_thread mess in cpus.c is probably still not perfact though.

The patch 1/5 just extracts from KVM specific header the cpu_synchronize_
functions that HAX is also using.

I have tested the end result on a Windows 10 Pro machine (with UG support)
with the Intel HAXM module 6.0.4 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 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 (5):
  kvm: move cpu synchronization code
  target-i386: Add Intel HAX files
  hax: remove non UG code
  hax: simplify init
  Plumb the HAXM-based hardware acceleration support

 Makefile.target             |    1 +
 configure                   |   18 +
 cpus.c                      |   88 ++-
 exec.c                      |   16 +
 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 +-
 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       | 1327 +++++++++++++++++++++++++++++++++++++++++++
 target-i386/hax-i386.h      |   90 +++
 target-i386/hax-interface.h |  357 ++++++++++++
 target-i386/hax-slot.c      |  333 +++++++++++
 target-i386/hax-slot.h      |   58 ++
 target-i386/hax-windows.c   |  489 ++++++++++++++++
 target-i386/hax-windows.h   |   89 +++
 target-i386/helper.c        |    1 +
 target-i386/kvm.c           |    1 +
 vl.c                        |   15 +-
 29 files changed, 3054 insertions(+), 32 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-i386.h
 create mode 100644 target-i386/hax-interface.h
 create mode 100644 target-i386/hax-slot.c
 create mode 100644 target-i386/hax-slot.h
 create mode 100644 target-i386/hax-windows.c
 create mode 100644 target-i386/hax-windows.h

-- 
2.8.0.rc3.226.g39d4020