[PATCH v2 0/4] KVM: Improve IRQ assignment for device passthrough

[Jan Kiszka <jan.kiszka@siemens.com>]

Four patches to improve "classic" device assigment /wrt IRQs. Highlight
is the last one that resolves the host IRQ sharing issue for all PCI 2.3
devices. Quite essential when passing non-MSI-ready devices like many
USB host controllers.

Changes in v2:
 - Reworked IRQ forwarding path to use threaded IRQs (direct signalling
   from IRQ context does not work out of the box and may be too lengthy)
 - Refactored host IRQ naming of assigned devices (cosmetic change)
 - Avoid unmask on ack when the next IRQ is pending, rather reassert the
   guest line (PCI-2.3 patch)
 - Refactored PCI-2.3 patch (but still no control knob for shared mode -
   is that a must?)

Jan Kiszka (4):
  KVM: Clear assigned guest IRQ on release
  KVM: Switch assigned device IRQ forwarding to threaded handler
  KVM: Refactor IRQ names of assigned devices
  KVM: Allow host IRQ sharing for passed-through PCI 2.3 devices

 include/linux/kvm_host.h |   14 +--
 virt/kvm/assigned-dev.c  |  279 +++++++++++++++++++++++++++++++++------------
 2 files changed, 208 insertions(+), 85 deletions(-)