[PATCH v9 00/18] Add VT-d Posted-Interrupts support - including prerequisite series

[Feng Wu]

VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt.
With VT-d Posted-Interrupts enabled, external interrupts from
direct-assigned devices can be delivered to guests without VMM
intervention when guest is running in non-root mode.

You can find the VT-d Posted-Interrtups Spec. in the following URL:
http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html

v9:
- Include the whole series:
[01/18]: irq bypasser manager
[02/18] - [06/18]: Common non-architecture part for VT-d PI and ARM side forwarded irq
[07/18] - [18/18]: VT-d PI part

v8:
refer to the changelog in each patch

v7:
* Define two weak irq bypass callbacks:
  - kvm_arch_irq_bypass_start()
  - kvm_arch_irq_bypass_stop()
* Remove the x86 dummy implementation of the above two functions.
* Print some useful information instead of WARN_ON() when the
  irq bypass consumer unregistration fails.
* Fix an issue when calling pi_pre_block and pi_post_block.

v6:
* Rebase on 4.2.0-rc6
* Rebase on https://lkml.org/lkml/2015/8/6/526 and http://www.gossamer-threads.com/lists/linux/kernel/2235623
* Make the add_consumer and del_consumer callbacks static
* Remove pointless INIT_LIST_HEAD to 'vdev->ctx[vector].producer.node)'
* Use dev_info instead of WARN_ON() when irq_bypass_register_producer fails
* Remove optional dummy callbacks for irq producer

v4:
* For lowest-priority interrupt, only support single-CPU destination
interrupts at the current stage, more common lowest priority support
will be added later.
* Accoring to Marcelo's suggestion, when vCPU is blocked, we handle
the posted-interrupts in the HLT emulation path.
* Some small changes (coding style, typo, add some code comments)

v3:
* Adjust the Posted-interrupts Descriptor updating logic when vCPU is
  preempted or blocked.
* KVM_DEV_VFIO_DEVICE_POSTING_IRQ --> KVM_DEV_VFIO_DEVICE_POST_IRQ
* __KVM_HAVE_ARCH_KVM_VFIO_POSTING --> __KVM_HAVE_ARCH_KVM_VFIO_POST
* Add KVM_DEV_VFIO_DEVICE_UNPOST_IRQ attribute for VFIO irq, which
  can be used to change back to remapping mode.
* Fix typo

v2:
* Use VFIO framework to enable this feature, the VFIO part of this series is
  base on Eric's patch "[PATCH v3 0/8] KVM-VFIO IRQ forward control"
* Rebase this patchset on git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git,
  then revise some irq logic based on the new hierarchy irqdomain patches provided
  by Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>


*** BLURB HERE ***

Alex Williamson (1):
  virt: IRQ bypass manager

Eric Auger (4):
  KVM: arm/arm64: select IRQ_BYPASS_MANAGER
  KVM: create kvm_irqfd.h
  KVM: introduce kvm_arch functions for IRQ bypass
  KVM: eventfd: add irq bypass consumer management

Feng Wu (13):
  KVM: x86: select IRQ_BYPASS_MANAGER
  KVM: Extend struct pi_desc for VT-d Posted-Interrupts
  KVM: Add some helper functions for Posted-Interrupts
  KVM: Define a new interface kvm_intr_is_single_vcpu()
  KVM: Make struct kvm_irq_routing_table accessible
  KVM: make kvm_set_msi_irq() public
  vfio: Register/unregister irq_bypass_producer
  KVM: x86: Update IRTE for posted-interrupts
  KVM: Implement IRQ bypass consumer callbacks for x86
  KVM: Add an arch specific hooks in 'struct kvm_kernel_irqfd'
  KVM: Update Posted-Interrupts Descriptor when vCPU is preempted
  KVM: Update Posted-Interrupts Descriptor when vCPU is blocked
  iommu/vt-d: Add a command line parameter for VT-d posted-interrupts

 Documentation/kernel-parameters.txt   |   1 +
 Documentation/virtual/kvm/locking.txt |  12 ++
 MAINTAINERS                           |   7 +
 arch/arm/kvm/Kconfig                  |   2 +
 arch/arm/kvm/Makefile                 |   1 +
 arch/arm64/kvm/Kconfig                |   2 +
 arch/arm64/kvm/Makefile               |   1 +
 arch/x86/include/asm/kvm_host.h       |  24 +++
 arch/x86/kvm/Kconfig                  |   3 +
 arch/x86/kvm/Makefile                 |   3 +
 arch/x86/kvm/irq_comm.c               |  32 ++-
 arch/x86/kvm/lapic.c                  |  59 ++++++
 arch/x86/kvm/lapic.h                  |   2 +
 arch/x86/kvm/trace.h                  |  33 ++++
 arch/x86/kvm/vmx.c                    | 361 +++++++++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c                    | 108 +++++++++-
 drivers/iommu/irq_remapping.c         |  12 +-
 drivers/vfio/pci/Kconfig              |   1 +
 drivers/vfio/pci/vfio_pci_intrs.c     |   9 +
 drivers/vfio/pci/vfio_pci_private.h   |   2 +
 include/linux/irqbypass.h             |  90 +++++++++
 include/linux/kvm_host.h              |  29 +++
 include/linux/kvm_irqfd.h             |  71 +++++++
 virt/kvm/Kconfig                      |   3 +
 virt/kvm/eventfd.c                    | 142 +++++++------
 virt/kvm/irqchip.c                    |  10 -
 virt/kvm/kvm_main.c                   |   3 +
 virt/lib/Kconfig                      |   2 +
 virt/lib/Makefile                     |   1 +
 virt/lib/irqbypass.c                  | 257 ++++++++++++++++++++++++
 30 files changed, 1182 insertions(+), 101 deletions(-)
 create mode 100644 include/linux/irqbypass.h
 create mode 100644 include/linux/kvm_irqfd.h
 create mode 100644 virt/lib/Kconfig
 create mode 100644 virt/lib/Makefile
 create mode 100644 virt/lib/irqbypass.c

-- 
2.1.0

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