[Qemu-devel] [RFC][PATCH 00/11] uq/master: irqfd-based interrupt injection for virtio/vhost

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

This series is another major milestone of merging qemu-kvm into
upstream. It implements the required interfaces and logic to directly
inject MSI-X interrupts generated by the vhost-net kernel module into
the KVM in-kernel irqchip. This involves
 - establishing MSI vector notifiers, so far triggered on relevant MSI-X
   configuration changes of subscribed PCI devices
 - support for static vIRQ-to-MSI routes
 - an API for linking an IRQFD with such a vIRQ
 - the usage of these services in virtio-pci to enable direct injection

The series also contains some smaller refactorings of the KVM IRQ
routing API such as automatic committing of route changes. It applies on
top of the KVM MSI support series [1] posted recently. The complete
stack is available at

    git://git.kiszka.org/qemu-kvm.git queues/kvm-msi-irqfd

If the proposes API is acceptable, I will also provide some morphing
patches for qemu-kvm to make the merge of both trees smoother.

After this series, to only reasons to still use qemu-kvm for production
purposes will be PCI device assignment and potential dependencies on
legacy command line switches as well as vmstate formats (when requiring
backward migration support). However, the majority of users should be
able to switch to upstream QEMU seamlessly and finally receive the same
level of performance on x86.

[1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/90651

Jan Kiszka (11):
  msix: Factor out msix_get_message
  msix: Invoke msix_handle_mask_update on msix_mask_all
  msix: Introduce vector notifiers
  kvm: Rename kvm_irqchip_add_route to kvm_irqchip_add_irq_route
  kvm: Introduce kvm_irqchip_add_msi_route
  kvm: Publicize kvm_release_gsi as kvm_irqchip_release_virq
  kvm: Make kvm_irqchip_commit_routes an internal service
  kvm: Introduce kvm_irqchip_add/remove_irqfd
  kvm: Enable use of kvm_irqchip_in_kernel in hwlib code
  msix: Add msix_nr_vectors_allocated
  virtio/vhost: Add support for KVM in-kernel MSI injection

 hw/msix.c       |  116 ++++++++++++++++++++++++++++++++++++++++++++++++---
 hw/msix.h       |    6 +++
 hw/pc_piix.c    |   14 ++----
 hw/pci.h        |    8 ++++
 hw/virtio-pci.c |  126 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 hw/virtio-pci.h |    6 +++
 kvm-all.c       |   97 +++++++++++++++++++++++++++++++++++-------
 kvm-stub.c      |   23 ++++++++++
 kvm.h           |   17 +++++---
 9 files changed, 375 insertions(+), 38 deletions(-)

-- 
1.7.3.4