[V2,43/45] vfio/iommufd: change process

Commit Message

Steven Sistare Feb. 14, 2025, 2:14 p.m. UTC

Finish CPR by change the owning process of the iommufd device in
post load.

Signed-off-by: Steve Sistare <[e-mail]>
---
 hw/vfio/cpr-iommufd.c | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

Patch

diff --git a/hw/vfio/cpr-iommufd.c b/hw/vfio/cpr-iommufd.c
index 4b78ebf..92b101d 100644
--- a/hw/vfio/cpr-iommufd.c
+++ b/hw/vfio/cpr-iommufd.c
@@ -46,10 +46,27 @@  static int vfio_container_post_load(void *opaque, int version_id)
     return 0;
 }
 
+static int vfio_container_pre_save(void *opaque)
+{
+    VFIOIOMMUFDContainer *container = opaque;
+    Error *err = NULL;
+
+    /*
+     * The process has not changed yet, but proactively call the ioctl,
+     * and it will fail if any DMA mappings are not supported.
+     */
+    if (!iommufd_change_process(container->be, &err)) {
+        error_report_err(err);
+        return -1;
+    }
+    return 0;
+}
+
 static const VMStateDescription vfio_container_vmstate = {
     .name = "vfio-iommufd-container",
     .version_id = 0,
     .minimum_version_id = 0,
+    .pre_save = vfio_container_pre_save,
     .post_load = vfio_container_post_load,
     .needed = cpr_needed_for_reuse,
     .fields = (VMStateField[]) {
@@ -58,10 +75,23 @@  static const VMStateDescription vfio_container_vmstate = {
     }
 };
 
+static int iommufd_cpr_post_load(void *opaque, int version_id)
+{
+     IOMMUFDBackend *be = opaque;
+     Error *err = NULL;
+
+     if (!iommufd_change_process(be, &err)) {
+        error_report_err(err);
+        return -1;
+     }
+     return 0;
+}
+
 static const VMStateDescription iommufd_cpr_vmstate = {
     .name = "iommufd",
     .version_id = 0,
     .minimum_version_id = 0,
+    .post_load = iommufd_cpr_post_load,
     .needed = cpr_needed_for_reuse,
     .fields = (VMStateField[]) {
         VMSTATE_END_OF_LIST()