diff options
| author | Cédric Le Goater <clg@redhat.com> | 2025-09-18 14:19:28 +0200 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2025-10-06 11:22:48 -0600 |
| commit | 451bb96328981808463405d436bd58de16dd967d (patch) | |
| tree | d284a10800c718fd8909a712100913a03f8209ba | |
| parent | d14de5b92578c769e12d84c9bdeee5627c042270 (diff) | |
vfio: Dump migration features under debugfs
A debugfs directory was recently added for VFIO devices. Add a new
"features" file under the migration sub-directory to expose which
features the device supports.
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20250918121928.1921871-1-clg@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
| -rw-r--r-- | Documentation/ABI/testing/debugfs-vfio | 6 | ||||
| -rw-r--r-- | drivers/vfio/debugfs.c | 19 |
2 files changed, 25 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/debugfs-vfio b/Documentation/ABI/testing/debugfs-vfio index 90f7c262f591..70ec2d454686 100644 --- a/Documentation/ABI/testing/debugfs-vfio +++ b/Documentation/ABI/testing/debugfs-vfio @@ -23,3 +23,9 @@ Contact: Longfang Liu <liulongfang@huawei.com> Description: Read the live migration status of the vfio device. The contents of the state file reflects the migration state relative to those defined in the vfio_device_mig_state enum + +What: /sys/kernel/debug/vfio/<device>/migration/features +Date: Oct 2025 +KernelVersion: 6.18 +Contact: Cédric Le Goater <clg@redhat.com> +Description: Read the migration features of the vfio device. diff --git a/drivers/vfio/debugfs.c b/drivers/vfio/debugfs.c index 298bd866f157..8b0ca7a09064 100644 --- a/drivers/vfio/debugfs.c +++ b/drivers/vfio/debugfs.c @@ -58,6 +58,23 @@ static int vfio_device_state_read(struct seq_file *seq, void *data) return 0; } +static int vfio_device_features_read(struct seq_file *seq, void *data) +{ + struct device *vf_dev = seq->private; + struct vfio_device *vdev = container_of(vf_dev, struct vfio_device, device); + + if (vdev->migration_flags & VFIO_MIGRATION_STOP_COPY) + seq_puts(seq, "stop-copy\n"); + if (vdev->migration_flags & VFIO_MIGRATION_P2P) + seq_puts(seq, "p2p\n"); + if (vdev->migration_flags & VFIO_MIGRATION_PRE_COPY) + seq_puts(seq, "pre-copy\n"); + if (vdev->log_ops) + seq_puts(seq, "dirty-tracking\n"); + + return 0; +} + void vfio_device_debugfs_init(struct vfio_device *vdev) { struct device *dev = &vdev->device; @@ -72,6 +89,8 @@ void vfio_device_debugfs_init(struct vfio_device *vdev) vdev->debug_root); debugfs_create_devm_seqfile(dev, "state", vfio_dev_migration, vfio_device_state_read); + debugfs_create_devm_seqfile(dev, "features", vfio_dev_migration, + vfio_device_features_read); } } |