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* [PATCH V2 0/6] IRQ offloading for vDPA
@ 2020-07-16 11:23 Zhu Lingshan
  2020-07-16 11:23 ` [PATCH V2 1/6] vhost: introduce vhost_call_ctx Zhu Lingshan
                   ` (5 more replies)
  0 siblings, 6 replies; 21+ messages in thread
From: Zhu Lingshan @ 2020-07-16 11:23 UTC (permalink / raw)
  To: mst, alex.williamson, pbonzini, sean.j.christopherson, wanpengli,
	jasowang
  Cc: virtualization, netdev, kvm, Zhu Lingshan

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.

changes from V1:
(1)dropped vfio changes.
(3)removed KVM_HVAE_IRQ_BYPASS checks
(4)locking fixes
(5)simplified vhost_vdpa_update_vq_irq()
(6)minor improvements

Zhu Lingshan (6):
  vhost: introduce vhost_call_ctx
  kvm: detect assigned device via irqbypass manager
  vDPA: implement IRQ offloading helpers in vDPA core
  vhost_vdpa: implement IRQ offloading in vhost_vdpa
  ifcvf: replace irq_request/free with vDPA helpers
  irqbypass: do not start cons/prod when failed connect

 arch/x86/kvm/x86.c              | 10 ++++++--
 drivers/vdpa/ifcvf/ifcvf_main.c | 14 +++++++----
 drivers/vdpa/vdpa.c             | 42 +++++++++++++++++++++++++++++++++
 drivers/vhost/Kconfig           |  1 +
 drivers/vhost/vdpa.c            | 52 +++++++++++++++++++++++++++++++++++++++--
 drivers/vhost/vhost.c           | 22 ++++++++++++-----
 drivers/vhost/vhost.h           |  9 ++++++-
 include/linux/vdpa.h            | 13 +++++++++++
 virt/lib/irqbypass.c            | 16 ++++++++-----
 9 files changed, 157 insertions(+), 22 deletions(-)

-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 21+ messages in thread

end of thread, other threads:[~2020-07-21  2:52 UTC | newest]

Thread overview: 21+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-16 11:23 [PATCH V2 0/6] IRQ offloading for vDPA Zhu Lingshan
2020-07-16 11:23 ` [PATCH V2 1/6] vhost: introduce vhost_call_ctx Zhu Lingshan
2020-07-17  3:32   ` Jason Wang
2020-07-20  7:40     ` Zhu, Lingshan
2020-07-16 11:23 ` [PATCH V2 2/6] kvm: detect assigned device via irqbypass manager Zhu Lingshan
2020-07-17  4:01   ` Jason Wang
2020-07-20  7:40     ` Zhu, Lingshan
2020-07-17 18:08   ` Alex Williamson
2020-07-20  4:19     ` Jason Wang
2020-07-16 11:23 ` [PATCH V2 3/6] vDPA: implement IRQ offloading helpers in vDPA core Zhu Lingshan
2020-07-17  4:19   ` Jason Wang
     [not found]     ` <45b2cc93-6ae1-47c7-aae6-01afdab1094b@intel.com>
2020-07-20  9:40       ` Jason Wang
     [not found]         ` <8c9adead-d3a0-374e-e817-3cb5a44c4bda@intel.com>
2020-07-21  2:51           ` Jason Wang
2020-07-16 11:23 ` [PATCH V2 4/6] vhost_vdpa: implement IRQ offloading in vhost_vdpa Zhu Lingshan
2020-07-17  5:29   ` Jason Wang
2020-07-17 10:07   ` kernel test robot
2020-07-17 10:07     ` kernel test robot
2020-07-17 10:07     ` kernel test robot
2020-07-16 11:23 ` [PATCH V2 5/6] ifcvf: replace irq_request/free with vDPA helpers Zhu Lingshan
2020-07-17  5:32   ` Jason Wang
2020-07-16 11:23 ` [PATCH V2 6/6] irqbypass: do not start cons/prod when failed connect Zhu Lingshan

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