[v4 00/16] Add VT-d Posted-Interrupts support

Feng Wu
2015-06-11T11:01:33Z

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

This series was part of http://thread.gmane.org/gmane.linux.kernel.iommu/7708. To make things clear, send out IOMMU part here.

This patch-set is based on the lastest x86/apic branch of tip tree.

Divide the whole series which contain multiple components into three parts:
- Prerequisite changes to irq subsystem (already merged in tip/x86/apic)
- IOMMU part (about to be merged in merged in tip/x86/apic), here is the
latest version: https://lkml.org/lkml/2015/6/9/22
- KVM and VFIO parts (this series)

Patch 8, 9, and 10 are from Eric Auger, there are some common VFIO APIs
defined in them. I integrate them in this series and use the APIs in
my patches.

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)

Eric Auger (3):
KVM: kvm-vfio: User API for IRQ forwarding
VFIO: external user API for interaction
KVM: kvm-vfio: wrappers to VFIO external API device helpers

Feng Wu (13):
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: Get Posted-Interrupts descriptor address from struct kvm_vcpu
KVM: Add interfaces to control PI outside vmx
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
KVM: Update Posted-Interrupts Descriptor when vCPU is preempted
KVM: Update Posted-Interrupts Descriptor when vCPU is blocked
KVM: Warn if 'SN' is set during posting interrupts by software

Documentation/virtual/kvm/devices/vfio.txt | 43 ++++-
arch/x86/include/asm/kvm_host.h | 16 ++
arch/x86/kvm/Makefile | 3 +-
arch/x86/kvm/irq_comm.c | 28 ++-
arch/x86/kvm/kvm_vfio_x86.c | 85 +++++++++
arch/x86/kvm/vmx.c | 278 ++++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 42 +++--
drivers/vfio/vfio.c | 24 +++
include/linux/kvm_host.h | 40 +++++
include/linux/vfio.h | 3 +
include/uapi/linux/kvm.h | 14 ++
virt/kvm/irqchip.c | 11 --
virt/kvm/kvm_main.c | 3 +
virt/kvm/vfio.c | 200 +++++++++++++++++++++
14 files changed, 758 insertions(+), 32 deletions(-)
create mode 100644 arch/x86/kvm/kvm_vfio_x86.c

--
2.1.0