[v3] migration: Improve error reporting

[PATCH v3 19/26] vfio: Add Error** argument to vfio_devices_dma_logging_stop()

Cédric Le Goater posted 26 patches 8 months, 3 weeks ago

Diff against v1 v2 v4 v5
Download mbox

Maintainers: Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, Paolo Bonzini <pbonzini@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Eduardo Habkost <eduardo@habkost.net>, "Michael S. Tsirkin" <mst@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, David Gibson <david@gibson.dropbear.id.au>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Thomas Huth <thuth@redhat.com>, David Hildenbrand <david@redhat.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Alex Williamson <alex.williamson@redhat.com>, Peter Xu <peterx@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Fabiano Rosas <farosas@suse.de>, Stefan Hajnoczi <stefanha@redhat.com>, Fam Zheng <fam@euphon.net>, Eric Blake <eblake@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>, John Snow <jsnow@redhat.com>, Hyman Huang <yong.huang@smartx.com>

There is a newer version of this series

Expand all Fold all

[PATCH v3 19/26] vfio: Add Error** argument to vfio_devices_dma_logging_stop()

Posted by Cédric Le Goater 8 months, 3 weeks ago

This improves error reporting in the log_global_stop() VFIO handler.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
---

 Changes in v3:

 - Use error_setg_errno() in vfio_devices_dma_logging_stop() 
 
 hw/vfio/common.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 70e7c288f5f61f850fc9bbd204ecbe43c859f968..8fa232538d482f094643e0f1601b8ebe25fe077f 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -938,12 +938,14 @@ static void vfio_dirty_tracking_init(VFIOContainerBase *bcontainer,
     memory_listener_unregister(&dirty.listener);
 }
 
-static void vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer)
+static int vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer,
+                                          Error **errp)
 {
     uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
                               sizeof(uint64_t))] = {};
     struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
     VFIODevice *vbasedev;
+    int ret = 0;
 
     feature->argsz = sizeof(buf);
     feature->flags = VFIO_DEVICE_FEATURE_SET |
@@ -955,11 +957,17 @@ static void vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer)
         }
 
         if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
-            warn_report("%s: Failed to stop DMA logging, err %d (%s)",
-                        vbasedev->name, -errno, strerror(errno));
+            /* Keep first error */
+            if (!ret) {
+                ret = -errno;
+                error_setg_errno(errp, errno, "%s: Failed to stop DMA logging",
+                                 vbasedev->name);
+            }
         }
         vbasedev->dirty_tracking = false;
     }
+
+    return ret;
 }
 
 static struct vfio_device_feature *
@@ -1068,7 +1076,8 @@ static int vfio_devices_dma_logging_start(VFIOContainerBase *bcontainer,
 
 out:
     if (ret) {
-        vfio_devices_dma_logging_stop(bcontainer);
+        /* Ignore the potential errors when doing rollback */
+        vfio_devices_dma_logging_stop(bcontainer, NULL);
     }
 
     vfio_device_feature_dma_logging_start_destroy(feature);
@@ -1105,7 +1114,7 @@ static bool vfio_listener_log_global_stop(MemoryListener *listener,
     int ret = 0;
 
     if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
-        vfio_devices_dma_logging_stop(bcontainer);
+        ret = vfio_devices_dma_logging_stop(bcontainer, errp);
     } else {
         ret = vfio_container_set_dirty_page_tracking(bcontainer, false, errp);
     }
-- 
2.44.0