netdev - [PATCH 0/7] *** IRQ offloading for vDPA ***

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Date:   Sun, 12 Jul 2020 22:52:04 +0800
From:   Zhu Lingshan <lingshan.zhu@...el.com>
To:     mst@...hat.com, jasowang@...hat.com, alex.williamson@...hat.com,
        pbonzini@...hat.com, sean.j.christopherson@...el.com,
        wanpengli@...cent.com
Cc:     virtualization@...ts.linux-foundation.org, kvm@...r.kernel.org,
        netdev@...r.kernel.org, dan.daly@...el.com,
        Zhu Lingshan <lingshan.zhu@...el.com>
Subject: [PATCH 0/7] *** IRQ offloading for vDPA ***

Hi All,

This series intends to implement IRQ offloading for
vhost_vdpa.

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(-)

-- 
1.8.3.1