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Date:   Sun, 12 Jul 2020 22:52:04 +0800
From:   Zhu Lingshan <>
        Zhu Lingshan <>
Subject: [PATCH 0/7] *** IRQ offloading for vDPA ***

Hi All,

This series intends to implement IRQ offloading for

By the feat of irq forwarding facilities like posted
interrupt on X86, irq bypass can  help deliver
interrupts to vCPU directly.

vDPA devices have dedicated hardware backends like VFIO
pass-throughed devices. So it would be possible to setup
irq offloading(irq bypass) for vDPA devices and gain
performance improvements.

In my testing, with this feature, we can save 0.1ms
in a ping between two VFs on average.

Zhu Lingshan (7):
  vhost: introduce vhost_call_ctx
  kvm/vfio: detect assigned device via irqbypass manager
  vhost_vdpa: implement IRQ offloading functions in vhost_vdpa
  vDPA: implement IRQ offloading helpers in vDPA core
  virtio_vdpa: init IRQ offloading function pointers to NULL.
  ifcvf: replace irq_request/free with helpers in vDPA core.
  irqbypass: do not start consumer or producer when failed to connect

 arch/x86/kvm/x86.c              | 10 ++++--
 drivers/vdpa/ifcvf/ifcvf_main.c | 11 +++---
 drivers/vdpa/vdpa.c             | 46 +++++++++++++++++++++++++
 drivers/vhost/Kconfig           |  1 +
 drivers/vhost/vdpa.c            | 75 +++++++++++++++++++++++++++++++++++++++--
 drivers/vhost/vhost.c           | 22 ++++++++----
 drivers/vhost/vhost.h           |  9 ++++-
 drivers/virtio/virtio_vdpa.c    |  2 ++
 include/linux/vdpa.h            | 11 ++++++
 virt/kvm/vfio.c                 |  2 --
 virt/lib/irqbypass.c            | 16 +++++----
 11 files changed, 181 insertions(+), 24 deletions(-)


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