qemu-kvm: vhost net port

This is port of vhost v1 patch set I posted previously to qemu-kvm, for those that want to get good performance out of it :)
This includes irqchip support and merge fixup on top of upstream patch.

Michael S. Tsirkin (20):
exec: memory notifiers
kvm: move kvm_set_phys_mem around
kvm: move kvm to use memory notifiers
qemu-kvm: fixup after merging memory notifiers
kvm: add API to set ioeventfd
notifier: event notifier implementation
virtio: add notifier support
virtio: add APIs for queue fields
virtio: add status change callback
virtio: move typedef to qemu-common
virtio-pci: fill in notifier support
tap: add interface to get device fd
vhost: vhost net support
tap: add vhost/vhostfd options
tap: add API to retrieve vhost net header
virtio-net: vhost net support
qemu-kvm: add vhost.h header
kvm: irqfd support
msix: add mask/unmask notifiers
virtio-pci: irqfd support

 Makefile.target           |    2 +
 cpu-common.h              |   19 ++
 exec.c                    |  111 ++++++++-
 hw/msix.c                 |   36 +++-
 hw/msix.h                 |    1 +
 hw/notifier.c             |   50 ++++
 hw/notifier.h             |   16 ++
 hw/pci.h                  |    6 +
 hw/s390-virtio-bus.c      |    3 +
 hw/syborg_virtio.c        |    2 +
 hw/vhost.c                |  603 +++++++++++++++++++++++++++++++++++++++++++++
 hw/vhost.h                |   44 ++++
 hw/vhost_net.c            |  147 +++++++++++
 hw/vhost_net.h            |   20 ++
 hw/virtio-net.c           |   67 +++++-
 hw/virtio-pci.c           |   95 +++++++
 hw/virtio.c               |   52 ++++-
 hw/virtio.h               |   15 +-
 kvm-all.c                 |  353 ++++++++++++++++-----------
 kvm.h                     |   34 ++-
 kvm/include/linux/vhost.h |  130 ++++++++++
 net.c                     |    8 +
 net/tap.c                 |   43 ++++
 net/tap.h                 |    5 +
 qemu-common.h             |    2 +
 qemu-kvm.c                |    1 +
 qemu-options.hx           |    4 +-
 27 files changed, 1704 insertions(+), 165 deletions(-)
 create mode 100644 hw/notifier.c
 create mode 100644 hw/notifier.h
 create mode 100644 hw/vhost.c
 create mode 100644 hw/vhost.h
 create mode 100644 hw/vhost_net.c
 create mode 100644 hw/vhost_net.h
 create mode 100644 kvm/include/linux/vhost.h