virtio: MSI-X support

Here's an updated draft of virtio patches which work with the qemu-kvm code that I just posted. This still needs to be rebased on top of Rusty's recent virtqueue list patch. I am posting it in case people want to start trying MSI-X out.

Michael S. Tsirkin (3):
virtio: find_vqs/del_vqs virtio operations
virtio_pci: split up vp_interrupt
virtio_pci: optional MSI-X support

 drivers/block/virtio_blk.c          |   11 +-
 drivers/char/hw_random/virtio-rng.c |   11 +-
 drivers/char/virtio_console.c       |   27 ++--
 drivers/lguest/lguest_device.c      |   49 ++++++-
 drivers/net/virtio_net.c            |   48 +++----
 drivers/s390/kvm/kvm_virtio.c       |   64 ++++++++-
 drivers/virtio/virtio_balloon.c     |   29 ++--
 drivers/virtio/virtio_pci.c         |  291 ++++++++++++++++++++++++++++++-----
 include/linux/virtio_config.h       |   29 +++-
 include/linux/virtio_pci.h          |    8 +-
 net/9p/trans_virtio.c               |    7 +-
 11 files changed, 450 insertions(+), 124 deletions(-)