Re: [v5 00/19] Add VT-d Posted-Interrupts support

[Eric Auger <eric.auger@linaro.org>]

Hi Feng,
On 07/13/2015 11:47 AM, Feng Wu wrote:
> 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)
> - IOMMU part (already merged)
> - KVM and VFIO parts (this series)
> 
> v5:
> - Based on Alex and Eric's irq bypass manager:
> https://lkml.org/lkml/2015/7/10/663
> - Reuse some common patch from Eric

A comment about the overall structure. Previously you prefered to have 2
separate series, one usable by both of us and one with my forwarding
stuff. Why did you change your mind?

Best Regards

Eric
> 
> Eric Auger (3):
>   KVM: create kvm_irqfd.h
>   KVM: eventfd: add irq bypass information in irqfd
>   KVM: eventfd: add irq bypass consumer management
> 
> Feng Wu (16):
>   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
>   vfio: Select IRQ_BYPASS_MANAGER for vfio PCI devices
>   vfio: Register/unregister irq_bypass_producer
>   KVM, x86: Select IRQ_BYPASS_MANAGER for KVM_INTEL
>   KVM: x86: Update IRTE for posted-interrupts
>   KVM: x86: Add arch specific routines for irqbypass manager
>   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
>   KVM: Warn if 'SN' is set during posting interrupts by software
> 
>  arch/x86/include/asm/kvm_host.h     |  15 ++
>  arch/x86/kvm/Kconfig                |   1 +
>  arch/x86/kvm/irq_comm.c             |  28 +++-
>  arch/x86/kvm/vmx.c                  | 278 +++++++++++++++++++++++++++++++++++-
>  arch/x86/kvm/x86.c                  | 160 +++++++++++++++++++--
>  drivers/vfio/pci/Kconfig            |   1 +
>  drivers/vfio/pci/vfio_pci_intrs.c   |  19 +++
>  drivers/vfio/pci/vfio_pci_private.h |   2 +
>  include/linux/kvm_host.h            |  23 +++
>  include/linux/kvm_irqfd.h           |  74 ++++++++++
>  virt/kvm/eventfd.c                  | 115 ++++++---------
>  virt/kvm/irqchip.c                  |  11 --
>  virt/kvm/kvm_main.c                 |   3 +
>  13 files changed, 632 insertions(+), 98 deletions(-)
>  create mode 100644 include/linux/kvm_irqfd.h
>