RE: [PATCH V4 08/11] vfio/pci: Use bitfield for struct vfio_pci_core_device flags

[Tian, Kevin]

> From: Chatre, Reinette <reinette.chatre@xxxxxxxxx>
> Sent: Friday, April 28, 2023 1:36 AM
> 
> struct vfio_pci_core_device contains eleven boolean flags.
> Boolean flags clearly indicate their usage but space usage
> starts to be a concern when there are many.
> 
> An upcoming change adds another boolean flag to
> struct vfio_pci_core_device, thereby increasing the concern
> that the boolean flags are consuming unnecessary space.
> 
> Transition the boolean flags to use bitfields. On a system that
> uses one byte per boolean this reduces the space consumed
> by existing flags from 11 bytes to 2 bytes with room for
> a few more flags without increasing the structure's size.
> 
> Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
> Signed-off-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

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