From: Zhu Lingshan <lingshan.zhu@intel.com>
To: jasowang@redhat.com, alex.williamson@redhat.com, mst@redhat.com,
pbonzini@redhat.com, sean.j.christopherson@intel.com,
wanpengli@tencent.com
Cc: virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, kvm@vger.kernel.org,
Zhu Lingshan <lingshan.zhu@intel.com>
Subject: [PATCH V3 0/6] IRQ offloading for vDPA
Date: Wed, 22 Jul 2020 18:08:53 +0800 [thread overview]
Message-ID: <20200722100859.221669-1-lingshan.zhu@intel.com> (raw)
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 V2:
(1)rename struct vhost_call_ctx to vhost_vring_call
(2)add kvm_arch_end_assignment() in del_producer()
code path
(3)rename vDPA helpers to vdpa_devm_request_irq()
and vdpa_devm_free_irq(). Add better comments
for them.
(4)better comments for setup_vq_irq() and
unsetup_vq_irq()
(5)In vDPA VHOST_SET_VRING_CALL, will call vhost_vdpa_update_vq_irq()
without checking producer.irq, move this check into
vhost_vdpa_update_vq_irq(), so that get advantage of the spinlock.
(6)Add a function vhost_vdpa_clean_irq(), this function will unregister
the producer of vqs when vhost_vdpa_release(). This is safe
for control vq.
(7) minor improvements
changes from V1:
(1)dropped vfio changes.
(3)removed KVM_HVAE_IRQ_BYPASS checks
(4)locking fixes
(5)simplified vhost_vdpa_updat
Zhu Lingshan (6):
vhost: introduce vhost_vring_call
kvm: detect assigned device via irqbypass manager
vDPA: implement vq IRQ allocate/free 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 | 11 +++++-
drivers/vdpa/ifcvf/ifcvf_main.c | 14 ++++---
drivers/vdpa/vdpa.c | 49 +++++++++++++++++++++++
drivers/vhost/Kconfig | 1 +
drivers/vhost/vdpa.c | 70 +++++++++++++++++++++++++++++++--
drivers/vhost/vhost.c | 22 ++++++++---
drivers/vhost/vhost.h | 9 ++++-
include/linux/vdpa.h | 13 ++++++
virt/lib/irqbypass.c | 16 +++++---
9 files changed, 182 insertions(+), 23 deletions(-)
--
2.18.4
next reply other threads:[~2020-07-22 10:12 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 10:08 Zhu Lingshan [this message]
2020-07-22 10:08 ` [PATCH V3 1/6] vhost: introduce vhost_vring_call Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 2/6] kvm: detect assigned device via irqbypass manager Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 3/6] vDPA: implement vq IRQ allocate/free helpers in vDPA core Zhu Lingshan
2020-07-23 4:19 ` Jason Wang
2020-07-22 10:08 ` [PATCH V3 4/6] vhost_vdpa: implement IRQ offloading in vhost_vdpa Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 5/6] ifcvf: replace irq_request/free with vDPA helpers Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 6/6] irqbypass: do not start cons/prod when failed connect Zhu Lingshan
-- strict thread matches above, loose matches on Subject: below --
2020-07-22 9:49 [PATCH V3 0/6] IRQ offloading for vDPA Zhu Lingshan
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