[dpdk-dev] [PATCH v2 2/5] net/virtio: add interrupt configure for vdev

Tan, Jianfeng jianfeng.tan at intel.com
Wed Mar 29 09:03:16 CEST 2017

On 3/29/2017 2:27 PM, Yuanhan Liu wrote:
> On Tue, Mar 28, 2017 at 08:21:53AM +0000, Jianfeng Tan wrote:
>> For virtio PCI devices, interrupt should be configured before setting
>> VIRTIO_CONFIG_STATUS_DRIVER_OK so that QEMU can properly set eventfds
>> in the host.
>> For virtio virtual devices, VIRTIO_CONFIG_STATUS_DRIVER_OK should be
>> set firstly, so that intr_handle is initialized in
>> virtio_user_start_device().
> I'm wondering why can't you let virtio-user follow virtio-pci?

It's because that virtio-user not only counts on 
virtio_user_start_device() to allocate intr_handle, it also needs the 
information in this function to initialize this struct. For virtio-pci, 
similar information is from rte_intr_enable/rte_intr_efd_enable.

Or do you mean we can move calling virtio_user_start_device() ahead? I 
can hardly find other place instead of DRIVER_OK.


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