Re: [PATCH v29 05/17] vfio: Add VM state change handler to know state of VM

[Alex Williamson <alex.williamson@redhat.com>]

On Mon, 26 Oct 2020 15:06:15 +0530
Kirti Wankhede <kwankhede@nvidia.com> wrote:

> VM state change handler is called on change in VM's state. Based on
> VM state, VFIO device state should be changed.
> Added read/write helper functions for migration region.
> Added function to set device_state.
> 
> Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
> Reviewed-by: Neo Jia <cjia@nvidia.com>
> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Reviewed-by: Cornelia Huck <cohuck@redhat.com>
> ---
>  hw/vfio/migration.c           | 158 ++++++++++++++++++++++++++++++++++++++++++
>  hw/vfio/trace-events          |   2 +
>  include/hw/vfio/vfio-common.h |   4 ++
>  3 files changed, 164 insertions(+)
> 
> diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
> index fd7faf423cdc..65ce735d667b 100644
> --- a/hw/vfio/migration.c
> +++ b/hw/vfio/migration.c
[snip]
> @@ -64,6 +216,9 @@ static int vfio_migration_init(VFIODevice *vbasedev,
>          ret = -EINVAL;
>          goto err;
>      }
> +
> +    migration->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
> +                                                           vbasedev);
>      return 0;
>  
>  err:

Fails to build, @migration is not defined.  We could use
vbasedev->migration or pull defining and setting @migration from patch
06.  Thanks,

Alex