[PATCH v6 00/16] Add VT-d Posted-Interrupts support

From: Feng Wu
Date: Tue Aug 11 2015 - 02:16:38 EST

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:

* 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

* 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)

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

* 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>

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: 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
KVM: Warn if 'SN' is set during posting interrupts by software
iommu/vt-d: Add a command line parameter for VT-d posted-interrupts

Documentation/kernel-parameters.txt | 1 +
arch/x86/include/asm/kvm_host.h | 18 +++
arch/x86/kvm/Kconfig | 1 +
arch/x86/kvm/irq_comm.c | 28 +++-
arch/x86/kvm/vmx.c | 278 +++++++++++++++++++++++++++++++++++-
arch/x86/kvm/x86.c | 159 +++++++++++++++++++--
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/kvm_host.h | 28 ++++
include/linux/kvm_irqfd.h | 2 +
virt/kvm/eventfd.c | 12 +-
virt/kvm/irqchip.c | 10 --
virt/kvm/kvm_main.c | 3 +
15 files changed, 535 insertions(+), 29 deletions(-)


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