diff options
Diffstat (limited to 'hw/vfio/common.c')
| -rw-r--r-- | hw/vfio/common.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/hw/vfio/common.c b/hw/vfio/common.c index a3d758af8d..cd1f4af18a 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -1381,7 +1381,9 @@ void vfio_put_group(VFIOGroup *group) return; } - qemu_balloon_inhibit(false); + if (!group->balloon_allowed) { + qemu_balloon_inhibit(false); + } vfio_kvm_device_del_group(group); vfio_disconnect_container(group); QLIST_REMOVE(group, next); @@ -1417,6 +1419,25 @@ int vfio_get_device(VFIOGroup *group, const char *name, return ret; } + /* + * Clear the balloon inhibitor for this group if the driver knows the + * device operates compatibly with ballooning. Setting must be consistent + * per group, but since compatibility is really only possible with mdev + * currently, we expect singleton groups. + */ + if (vbasedev->balloon_allowed != group->balloon_allowed) { + if (!QLIST_EMPTY(&group->device_list)) { + error_setg(errp, + "Inconsistent device balloon setting within group"); + return -1; + } + + if (!group->balloon_allowed) { + group->balloon_allowed = true; + qemu_balloon_inhibit(false); + } + } + vbasedev->fd = fd; vbasedev->group = group; QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); |