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 19:18:51 +0530
Kirti Wankhede <kwankhede@nvidia.com> wrote:

> On 10/26/2020 6:30 PM, Alex Williamson wrote:
> > 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,
> >   
> 
> Pulling and setting migration from patch 06 seems better option.
> Should I resend patch 5 & 6 only?

I've resolved this locally as patch 05:

@@ -38,6 +190,7 @@ static int vfio_migration_init(VFIODevice *vbasedev,
 {
     int ret;
     Object *obj;
+    VFIOMigration *migration;
 
     if (!vbasedev->ops->vfio_get_object) {
         return -EINVAL;
@@ -64,6 +217,10 @@ static int vfio_migration_init(VFIODevice *vbasedev,
         ret = -EINVAL;
         goto err;
     }
+
+    migration = vbasedev->migration;
+    migration->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
+                                                           vbasedev);
     return 0;
 
 err:

patch 06:

@@ -219,8 +243,11 @@ static int vfio_migration_init(VFIODevice *vbasedev,
     }
 
     migration = vbasedev->migration;
+    migration->vbasedev = vbasedev;
     migration->vm_state = qemu_add_vm_change_state_handler(vfio_vmstate_change,
                                                            vbasedev);
+    migration->migration_state.notify = vfio_migration_state_notifier;
+    add_migration_state_change_notifier(&migration->migration_state);
     return 0;
 
 err:

If you're satisfied with that, no need to resend.  Thanks,

Alex