vfio/iommufd: preserve descriptors

Save the iommu and vfio device fd in CPR state when it is created.
After CPR, the fd number is found in CPR state and reused.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-16-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

1 files changed, 1 insertions, 8 deletions

diff --git a/hw/vfio/device.c b/hw/vfio/device.c
index 0ae3f3c660..96cf21462c 100644
--- a/hw/vfio/device.c
+++ b/hw/vfio/device.c
@@ -351,14 +351,7 @@ void vfio_device_free_name(VFIODevice *vbasedev)
 
 void vfio_device_set_fd(VFIODevice *vbasedev, const char *str, Error **errp)
 {
-    ERRP_GUARD();
-    int fd = monitor_fd_param(monitor_cur(), str, errp);
-
-    if (fd < 0) {
-        error_prepend(errp, "Could not parse remote object fd %s:", str);
-        return;
-    }
-    vbasedev->fd = fd;
+    vbasedev->fd = cpr_get_fd_param(vbasedev->dev->id, str, 0, errp);
 }
 
 static VFIODeviceIOOps vfio_device_io_ops_ioctl;