RE: [PATCH 2/2] vfio: Change vfio_group->group_rwsem to a mutex

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Sent: Thursday, September 29, 2022 10:59 PM
> 
> These days not much is using the read side:
>  - device first open
>  - ioctl_get_status
>  - device FD release
>  - check enforced_coherent
> 
> None of this is performance, so just make it into a normal mutex.
> 
> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>