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
