kvm: level irqfd and new eoifd

v5:
 - irqfds now have a one-to-one mapping with eoifds to prevent users
   from consuming all of kernel memory by repeatedly creating eoifds
   from a single irqfd.
 - implement a kvm_clear_irq() which does a test_and_clear_bit of
   the irq_state, only updating the pic/ioapic if changes and allowing
   the caller to know if anything was done.  I added this onto the end
   as it's essentially an optimization on the previous design.  It's
   hard to tell if there's an actual performance benefit to this.
 - dropped eoifd gsi support patch as it was only an FYI.

Thanks,

Alex

---

Alex Williamson (4):
      kvm: Convert eoifd to use kvm_clear_irq
      kvm: Create kvm_clear_irq()
      kvm: KVM_EOIFD, an eventfd for EOIs
      kvm: Extend irqfd to support level interrupts


 Documentation/virtual/kvm/api.txt |   28 +++
 arch/x86/kvm/x86.c                |    3 
 include/linux/kvm.h               |   18 ++
 include/linux/kvm_host.h          |   16 ++
 virt/kvm/eventfd.c                |  333 +++++++++++++++++++++++++++++++++++++
 virt/kvm/irq_comm.c               |   78 +++++++++
 virt/kvm/kvm_main.c               |   11 +
 7 files changed, 483 insertions(+), 4 deletions(-)
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