Hi Jason,

On Fri, Dec 24, 2021 at 3:13 PM Yi Wangwrote:

quoted

From: Zhang Min

Some applications like kata-containers need to acquire MAJOR/MINOR/DEVNAME
for devInfo [1], so regist vhost-vdpa dev class to expose uevent.

Hi:

I think we need to be more verbose here e.g:

1) why can't we get major/minor with the current interface

Although major/minor can be acquired in /sys/bus/vdpa/devices/vdpa0/vhost-vdpa/vhost-vdpa-0/dev,
applications like kata-containers prefer and actually have tried to obtain them
in /sys/class/vhost-vdpa/vhost-vdpa-0/uevent, such like [1].

2) what kind of the uevent is required and not supported currently

The items needed show in uevent are MAJOR MINOR DEVNAME that vhost_vdpa_probe
currently has registed, but dev_uevent_filter failed to pass and uevent show is
empty now, so we regist dev class to let dev_uevent_filter pass and show them.

1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go

Thanks

quoted

1. https://github.com/kata-containers/kata-containers/blob/main/src/runtime/virtcontainers/device/config/config.go

Signed-off-by: Zhang Min