Re: [PATCH v5 2/9] vfio: tolerate migration protocol v1 uapi renames

[Matthew Rosato]

On 4/12/22 11:50 AM, Pierre Morel wrote:
> On 4/4/22 20:17, Matthew Rosato wrote:
> > The v1 uapi is deprecated and will be replaced by v2 at some point;
> > this patch just tolerates the renaming of uapi fields to reflect
> > v1 / deprecated status.
> >
> > Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> > ---
> >   hw/vfio/common.c    |  2 +-
> >   hw/vfio/migration.c | 19 +++++++++++--------
> >   2 files changed, 12 insertions(+), 9 deletions(-)
>
>
> I do not understand why you need this patch in this series.
> Shouldn't it be separate?

This patch is included because of the patch 1 kernel header sync, which 
pulls in uapi headers from kernel version 5.18-rc1 + my unmerged kernel 
uapi changes.

This patch is unnecessary without a header sync (and in fact would break 
QEMU compile), and is unrelated to the rest of the series -- but QEMU 
will not compile without it once you update linux uapi headers to 
5.18-rc1 (or greater) due to the v1 uapi for vfio migration being 
deprecated [1].  This means that ANY series that does a linux header 
sync starting from here on will need something like this patch to go 
along with the header sync (or a series that replaces v1 usage with v2?).

If this patch looks good it could be included whenever a header sync is 
next needed, doesn't necessarily have to be with this series.

[1] https://www.spinics.net/lists/kernel/msg4288200.html

> > diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> > index 080046e3f5..7b1e12fb69 100644
> > --- a/hw/vfio/common.c
> > +++ b/hw/vfio/common.c
> > @@ -380,7 +380,7 @@ static bool 
> > vfio_devices_all_running_and_saving(VFIOContainer *container)
> >                   return false;
> >               }
> > -            if ((migration->device_state & VFIO_DEVICE_STATE_SAVING) &&
> > +            if ((migration->device_state & 
> > VFIO_DEVICE_STATE_V1_SAVING) &&
> >                   (migration->device_state & 
> > VFIO_DEVICE_STATE_RUNNING)) {
> >                   continue;
> >               } else {
> > diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
> > index ff6b45de6b..e109cee551 100644
> > --- a/hw/vfio/migration.c
> > +++ b/hw/vfio/migration.c
> > @@ -432,7 +432,7 @@ static int vfio_save_setup(QEMUFile *f, void *opaque)
> >       }
> >       ret = vfio_migration_set_state(vbasedev, VFIO_DEVICE_STATE_MASK,
> > -                                   VFIO_DEVICE_STATE_SAVING);
> > +                                   VFIO_DEVICE_STATE_V1_SAVING);
> >       if (ret) {
> >           error_report("%s: Failed to set state SAVING", vbasedev->name);
> >           return ret;
> > @@ -532,7 +532,7 @@ static int vfio_save_complete_precopy(QEMUFile *f, 
> > void *opaque)
> >       int ret;
> >       ret = vfio_migration_set_state(vbasedev, 
> > ~VFIO_DEVICE_STATE_RUNNING,
> > -                                   VFIO_DEVICE_STATE_SAVING);
> > +                                   VFIO_DEVICE_STATE_V1_SAVING);
> >       if (ret) {
> >           error_report("%s: Failed to set state STOP and SAVING",
> >                        vbasedev->name);
> > @@ -569,7 +569,7 @@ static int vfio_save_complete_precopy(QEMUFile *f, 
> > void *opaque)
> >           return ret;
> >       }
> > -    ret = vfio_migration_set_state(vbasedev, 
> > ~VFIO_DEVICE_STATE_SAVING, 0);
> > +    ret = vfio_migration_set_state(vbasedev, 
> > ~VFIO_DEVICE_STATE_V1_SAVING, 0);
> >       if (ret) {
> >           error_report("%s: Failed to set state STOPPED", 
> > vbasedev->name);
> >           return ret;
> > @@ -730,7 +730,7 @@ static void vfio_vmstate_change(void *opaque, bool 
> > running, RunState state)
> >            * start saving data.
> >            */
> >           if (state == RUN_STATE_SAVE_VM) {
> > -            value = VFIO_DEVICE_STATE_SAVING;
> > +            value = VFIO_DEVICE_STATE_V1_SAVING;
> >           } else {
> >               value = 0;
> >           }
> > @@ -768,8 +768,9 @@ static void vfio_migration_state_notifier(Notifier 
> > *notifier, void *data)
> >       case MIGRATION_STATUS_FAILED:
> >           bytes_transferred = 0;
> >           ret = vfio_migration_set_state(vbasedev,
> > -                      ~(VFIO_DEVICE_STATE_SAVING | 
> > VFIO_DEVICE_STATE_RESUMING),
> > -                      VFIO_DEVICE_STATE_RUNNING);
> > +                                       ~(VFIO_DEVICE_STATE_V1_SAVING |
> > +                                         VFIO_DEVICE_STATE_RESUMING),
> > +                                       VFIO_DEVICE_STATE_RUNNING);
> >           if (ret) {
> >               error_report("%s: Failed to set state RUNNING", 
> > vbasedev->name);
> >           }
> > @@ -864,8 +865,10 @@ int vfio_migration_probe(VFIODevice *vbasedev, 
> > Error **errp)
> >           goto add_blocker;
> >       }
> > -    ret = vfio_get_dev_region_info(vbasedev, VFIO_REGION_TYPE_MIGRATION,
> > -                                   VFIO_REGION_SUBTYPE_MIGRATION, 
> > &info);
> > +    ret = vfio_get_dev_region_info(vbasedev,
> > +                                   
> > VFIO_REGION_TYPE_MIGRATION_DEPRECATED,
> > +                                   
> > VFIO_REGION_SUBTYPE_MIGRATION_DEPRECATED,
> > +                                   &info);
> >       if (ret) {
> >           goto add_blocker;
> >       }