kvm: level triggered irqfd support

Here's a refined series based on my previous RFC.  I now have this
working through VFIO-based device assignment in Qemu.  I've split
up the patches and tried to generalize the interface as one of
potentially a couple ways we might support level irqfds.  I also
tried to document the requirements around re-asserting interrupts
and expectations for avoiding races.

The last patch in the series is just an FYI/RFC of something I
expect we're also going to need.  We want to take advantage of KVM
irqchip, but not be dependent on it.  That means we'll want to come
up with a way for Qemu to notify drivers of an EOI.  We won't want
that interface to break when when enabling the in-kernel irqchip.
The needs are just different enough that I don't see how to combine
them together.  Thanks,

Alex

---

Alex Williamson (4):
      [RFC] kvm: eoi_eventfd
      kvm: Extend irqfd to support level interrupts
      kvm: Add missing KVM_IRQFD API documentation
      kvm: Pass kvm_irqfd to functions


 Documentation/virtual/kvm/api.txt |   46 ++++++++
 arch/x86/kvm/x86.c                |    2 
 include/linux/kvm.h               |   18 +++
 include/linux/kvm_host.h          |   11 ++
 virt/kvm/eventfd.c                |  201 ++++++++++++++++++++++++++++++++++---
 virt/kvm/kvm_main.c               |   11 ++
 6 files changed, 268 insertions(+), 21 deletions(-)
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