vfio/migration: Query device dirty page tracking support

Now that everything has been set up for device dirty page tracking,
query the device for device dirty page tracking support.

Signed-off-by: Avihai Horon <avihaih@nvidia.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20230307125450.62409-15-joao.m.martins@oracle.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

diff --git a/hw/vfio/migration.c b/hw/vfio/migration.c
index 776fd2d7cdf3bfd09921b985c96d8b981a6fb380..5d1e66f69194f9bc0b5fa4e0e3379e17989d4afe 100644 (file)
--- a/hw/vfio/migration.c
+++ b/hw/vfio/migration.c
@@ -555,6 +555,19 @@ static int vfio_migration_query_flags(VFIODevice *vbasedev, uint64_t *mig_flags)
     return 0;
 }
 
+static bool vfio_dma_logging_supported(VFIODevice *vbasedev)
+{
+    uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
+                              sizeof(uint64_t))] = {};
+    struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
+
+    feature->argsz = sizeof(buf);
+    feature->flags = VFIO_DEVICE_FEATURE_PROBE |
+                     VFIO_DEVICE_FEATURE_DMA_LOGGING_START;
+
+    return !ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
+}
+
 static int vfio_migration_init(VFIODevice *vbasedev)
 {
     int ret;
@@ -589,6 +602,8 @@ static int vfio_migration_init(VFIODevice *vbasedev)
     migration->device_state = VFIO_DEVICE_STATE_RUNNING;
     migration->data_fd = -1;
 
+    vbasedev->dirty_pages_supported = vfio_dma_logging_supported(vbasedev);
+
     oid = vmstate_if_get_id(VMSTATE_IF(DEVICE(obj)));
     if (oid) {
         path = g_strdup_printf("%s/vfio", oid);