From: Zhu Lingshan <lingshan.zhu@intel.com>
To: mst@redhat.com, jasowang@redhat.com, alex.williamson@redhat.com,
pbonzini@redhat.com, sean.j.christopherson@intel.com,
wanpengli@tencent.com
Cc: virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
netdev@vger.kernel.org, dan.daly@intel.com,
Zhu Lingshan <lingshan.zhu@intel.com>
Subject: [PATCH 0/7] *** IRQ offloading for vDPA ***
Date: Sun, 12 Jul 2020 22:52:04 +0800 [thread overview]
Message-ID: <1594565524-3394-1-git-send-email-lingshan.zhu@intel.com> (raw)
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
next reply other threads:[~2020-07-12 14:52 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-12 14:52 Zhu Lingshan [this message]
2020-07-15 13:43 ` [PATCH 0/7] *** IRQ offloading for vDPA *** Jason Wang
[not found] ` <97032c51-3265-c94a-9ce1-f42fcc6d3075@intel.com>
2020-07-16 2:59 ` Jason Wang
[not found] ` <29ab6da8-ed8e-6b91-d658-f3d240543b29@intel.com>
[not found] ` <1e91d9dd-d787-beff-2c14-9c76ffc3b285@redhat.com>
[not found] ` <a319cba3-8b3d-8968-0fb7-48a1d34042bf@intel.com>
2020-07-16 4:20 ` Jason Wang
2020-07-16 6:15 ` Michael S. Tsirkin
2020-07-16 8:06 ` Jason Wang
2020-07-16 6:13 ` Michael S. Tsirkin
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