[v2 00/25] Add VT-d Posted-Interrupts support

[Feng Wu <feng.wu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>]

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

v1->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-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>

This patch series is made of the following groups:
1-6: Some preparation changes in iommu and irq component, this is based on the
     new hierarchy irqdomain logic.
7-9, 25: IOMMU changes for VT-d Posted-Interrupts, such as, feature detection,
          command line parameter.
10-16, 21-24: Changes related to KVM itself.
17-19: Changes in VFIO component, this part was previously sent out as
"[RFC PATCH v2 0/2] kvm-vfio: implement the vfio skeleton for VT-d Posted-Interrupts"
20: x86 irq related changes

Feng Wu (25):
  genirq: Introduce irq_set_vcpu_affinity() to target an interrupt to a
    VCPU
  iommu: Add new member capability to struct irq_remap_ops
  iommu, x86: Define new irte structure for VT-d Posted-Interrupts
  iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip
  x86, irq: Implement irq_set_vcpu_affinity for pci_msi_ir_controller
  iommu, x86: No need to migrating irq for VT-d Posted-Interrupts
  iommu, x86: Add cap_pi_support() to detect VT-d PI capability
  iommu, x86: Add intel_irq_remapping_capability() for Intel
  iommu, x86: define irq_remapping_cap()
  KVM: change struct pi_desc for VT-d Posted-Interrupts
  KVM: Add some helper functions for Posted-Interrupts
  KVM: Initialize VT-d Posted-Interrupts Descriptor
  KVM: Define a new interface kvm_find_dest_vcpu() for VT-d PI
  KVM: Get Posted-Interrupts descriptor address from struct kvm_vcpu
  KVM: Make struct kvm_irq_routing_table accessible
  KVM: make kvm_set_msi_irq() public
  KVM: kvm-vfio: User API for VT-d Posted-Interrupts
  KVM: kvm-vfio: implement the VFIO skeleton for VT-d Posted-Interrupts
  KVM: x86: kvm-vfio: VT-d posted-interrupts setup
  x86, irq: Define a global vector for VT-d Posted-Interrupts
  KVM: Update Posted-Interrupts descriptor during vCPU scheduling
  KVM: Change NDST field after vCPU scheduling
  KVM: Add the handler for Wake-up Vector
  KVM: Suppress posted-interrupt when 'SN' is set
  iommu/vt-d: Add a command line parameter for VT-d posted-interrupts

 Documentation/kernel-parameters.txt        |    1 +
 Documentation/virtual/kvm/devices/vfio.txt |    9 +
 arch/x86/include/asm/entry_arch.h          |    2 +
 arch/x86/include/asm/hardirq.h             |    1 +
 arch/x86/include/asm/hw_irq.h              |    2 +
 arch/x86/include/asm/irq_remapping.h       |   11 ++
 arch/x86/include/asm/irq_vectors.h         |    1 +
 arch/x86/include/asm/kvm_host.h            |   14 ++
 arch/x86/kernel/apic/msi.c                 |    1 +
 arch/x86/kernel/entry_64.S                 |    2 +
 arch/x86/kernel/irq.c                      |   27 +++
 arch/x86/kernel/irqinit.c                  |    2 +
 arch/x86/kvm/Makefile                      |    2 +-
 arch/x86/kvm/kvm_vfio_x86.c                |   68 ++++++++
 arch/x86/kvm/vmx.c                         |  251 +++++++++++++++++++++++++++-
 arch/x86/kvm/x86.c                         |   38 ++++-
 drivers/iommu/intel_irq_remapping.c        |   64 +++++++
 drivers/iommu/irq_remapping.c              |   24 +++-
 drivers/iommu/irq_remapping.h              |    8 +
 include/linux/dmar.h                       |   32 ++++
 include/linux/intel-iommu.h                |    1 +
 include/linux/irq.h                        |    7 +
 include/linux/kvm_host.h                   |   43 +++++
 include/uapi/linux/kvm.h                   |   10 +
 kernel/irq/chip.c                          |   14 ++
 kernel/irq/manage.c                        |   20 +++
 virt/kvm/irq_comm.c                        |   43 +++++-
 virt/kvm/irqchip.c                         |   11 --
 virt/kvm/kvm_main.c                        |   14 ++
 virt/kvm/vfio.c                            |  103 ++++++++++++
 30 files changed, 799 insertions(+), 27 deletions(-)
 create mode 100644 arch/x86/kvm/kvm_vfio_x86.c