[KVM PATCH v3 0/2] irqfd

[Gregory Haskins <ghaskins@novell.com>]

(Applies to kvm.git 41b76d8d0487c26d6d4d3fe53c1ff59b3236f096)

This series implements a mechanism called "irqfd".  It lets you create
an eventfd based file-desriptor to inject interrupts to a kvm guest.  We
associate one gsi per fd for fine-grained routing.

[ Changelog:

   v3:
        *) The kernel now allocates the eventfd (need to export sys_eventfd2)
        *) Added a flags field for future expansion to kvm_irqfd()
        *) We properly toggle the irq level 1+0.
        *) We re-use the USERSPACE_SRC_ID instead of creating our own
        *) Properly check for failures establishing a poll-table with eventfd
	*) Fixed fd/file leaks on failure
	*) Rebased to lateste kvm.git::41b76d8d04

   v2:
	*) Dropped notifier_chain based callbacks in favor of
	   wait_queue_t::func and file::poll based callbacks (Thanks to
	   Davide for the suggestion)

   v1:
        *) Initial release

--------

We do not have a user of this interface in this series, though note
future version of virtual-bus (v4 and above) will be based on this.

The first patch will require mainline buy-in, particularly from Davide
(cc'd).  The last patch is kvm specific.

qemu-kvm.git patch to follow.

-Greg

---

Gregory Haskins (2):
      kvm: add support for irqfd via eventfd-notification interface
      eventfd: export fget and signal interfaces for module use


 arch/x86/kvm/Makefile    |    2 -
 arch/x86/kvm/x86.c       |    1 
 fs/eventfd.c             |    4 +
 include/linux/kvm.h      |    7 ++
 include/linux/kvm_host.h |    4 +
 virt/kvm/irqfd.c         |  158 ++++++++++++++++++++++++++++++++++++++++++++++
 virt/kvm/kvm_main.c      |   11 +++
 7 files changed, 186 insertions(+), 1 deletions(-)
 create mode 100644 virt/kvm/irqfd.c

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