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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
