Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging

Block layer patches

- Supporting changing 'file' in x-blockdev-reopen
- ssh: add support for sha256 host key fingerprints
- vhost-user-blk: Implement reconnection during realize
- introduce QEMU_AUTO_VFREE
- Don't require password of encrypted backing file for image creation
- Code cleanups

# gpg: Signature made Wed 30 Jun 2021 17:00:55 BST
# gpg:                using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg:                issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* remotes/kevin/tags/for-upstream: (24 commits)
  vhost-user-blk: Implement reconnection during realize
  vhost-user-blk: Factor out vhost_user_blk_realize_connect()
  vhost: Distinguish errors in vhost_dev_get_config()
  vhost-user-blk: Add Error parameter to vhost_user_blk_start()
  vhost: Return 0/-errno in vhost_dev_init()
  vhost: Distinguish errors in vhost_backend_init()
  vhost: Add Error parameter to vhost_dev_init()
  block/ssh: add support for sha256 host key fingerprints
  block/commit: use QEMU_AUTO_VFREE
  introduce QEMU_AUTO_VFREE
  iotests: Test replacing files with x-blockdev-reopen
  block: Allow changing bs->file on reopen
  block: BDRVReopenState: drop replace_backing_bs field
  block: move supports_backing check to bdrv_set_file_or_backing_noperm()
  block: bdrv_reopen_parse_backing(): simplify handling implicit filters
  block: bdrv_reopen_parse_backing(): don't check frozen child
  block: bdrv_reopen_parse_backing(): don't check aio context
  block: introduce bdrv_set_file_or_backing_noperm()
  block: introduce bdrv_remove_file_or_backing_child()
  block: comment graph-modifying function not updating permissions
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 38 insertions, 33 deletions

diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index ee57abe045..1ac4a2ebec 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -1353,7 +1353,11 @@ static int vhost_user_get_u64(struct vhost_dev *dev, int request, uint64_t *u64)
 
 static int vhost_user_get_features(struct vhost_dev *dev, uint64_t *features)
 {
-    return vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features);
+    if (vhost_user_get_u64(dev, VHOST_USER_GET_FEATURES, features) < 0) {
+        return -EPROTO;
+    }
+
+    return 0;
 }
 
 static int vhost_user_set_owner(struct vhost_dev *dev)
@@ -1364,7 +1368,7 @@ static int vhost_user_set_owner(struct vhost_dev *dev)
     };
 
     if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
-        return -1;
+        return -EPROTO;
     }
 
     return 0;
@@ -1856,7 +1860,8 @@ static int vhost_user_postcopy_notifier(NotifierWithReturn *notifier,
     return 0;
 }
 
-static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
+static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque,
+                                   Error **errp)
 {
     uint64_t features, protocol_features, ram_slots;
     struct vhost_user *u;
@@ -1880,7 +1885,7 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
         err = vhost_user_get_u64(dev, VHOST_USER_GET_PROTOCOL_FEATURES,
                                  &protocol_features);
         if (err < 0) {
-            return err;
+            return -EPROTO;
         }
 
         dev->protocol_features =
@@ -1891,14 +1896,14 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
             dev->protocol_features &= ~(1ULL << VHOST_USER_PROTOCOL_F_CONFIG);
         } else if (!(protocol_features &
                     (1ULL << VHOST_USER_PROTOCOL_F_CONFIG))) {
-            error_report("Device expects VHOST_USER_PROTOCOL_F_CONFIG "
-                    "but backend does not support it.");
-            return -1;
+            error_setg(errp, "Device expects VHOST_USER_PROTOCOL_F_CONFIG "
+                       "but backend does not support it.");
+            return -EINVAL;
         }
 
         err = vhost_user_set_protocol_features(dev, dev->protocol_features);
         if (err < 0) {
-            return err;
+            return -EPROTO;
         }
 
         /* query the max queues we support if backend supports Multiple Queue */
@@ -1906,12 +1911,12 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
             err = vhost_user_get_u64(dev, VHOST_USER_GET_QUEUE_NUM,
                                      &dev->max_queues);
             if (err < 0) {
-                return err;
+                return -EPROTO;
             }
         }
         if (dev->num_queues && dev->max_queues < dev->num_queues) {
-            error_report("The maximum number of queues supported by the "
-                         "backend is %" PRIu64, dev->max_queues);
+            error_setg(errp, "The maximum number of queues supported by the "
+                       "backend is %" PRIu64, dev->max_queues);
             return -EINVAL;
         }
 
@@ -1920,9 +1925,9 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
                     VHOST_USER_PROTOCOL_F_SLAVE_REQ) &&
                  virtio_has_feature(dev->protocol_features,
                     VHOST_USER_PROTOCOL_F_REPLY_ACK))) {
-            error_report("IOMMU support requires reply-ack and "
-                         "slave-req protocol features.");
-            return -1;
+            error_setg(errp, "IOMMU support requires reply-ack and "
+                       "slave-req protocol features.");
+            return -EINVAL;
         }
 
         /* get max memory regions if backend supports configurable RAM slots */
@@ -1932,15 +1937,15 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
         } else {
             err = vhost_user_get_max_memslots(dev, &ram_slots);
             if (err < 0) {
-                return err;
+                return -EPROTO;
             }
 
             if (ram_slots < u->user->memory_slots) {
-                error_report("The backend specified a max ram slots limit "
-                             "of %" PRIu64", when the prior validated limit was %d. "
-                             "This limit should never decrease.", ram_slots,
-                             u->user->memory_slots);
-                return -1;
+                error_setg(errp, "The backend specified a max ram slots limit "
+                           "of %" PRIu64", when the prior validated limit was "
+                           "%d. This limit should never decrease.", ram_slots,
+                           u->user->memory_slots);
+                return -EINVAL;
             }
 
             u->user->memory_slots = MIN(ram_slots, VHOST_USER_MAX_RAM_SLOTS);
@@ -1958,7 +1963,7 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque)
     if (dev->vq_index == 0) {
         err = vhost_setup_slave_channel(dev);
         if (err < 0) {
-            return err;
+            return -EPROTO;
         }
     }
 
@@ -2112,7 +2117,7 @@ static void vhost_user_set_iotlb_callback(struct vhost_dev *dev, int enabled)
 }
 
 static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
-                                 uint32_t config_len)
+                                 uint32_t config_len, Error **errp)
 {
     VhostUserMsg msg = {
         .hdr.request = VHOST_USER_GET_CONFIG,
@@ -2122,32 +2127,32 @@ static int vhost_user_get_config(struct vhost_dev *dev, uint8_t *config,
 
     if (!virtio_has_feature(dev->protocol_features,
                 VHOST_USER_PROTOCOL_F_CONFIG)) {
-        return -1;
+        error_setg(errp, "VHOST_USER_PROTOCOL_F_CONFIG not supported");
+        return -EINVAL;
     }
 
-    if (config_len > VHOST_USER_MAX_CONFIG_SIZE) {
-        return -1;
-    }
+    assert(config_len <= VHOST_USER_MAX_CONFIG_SIZE);
 
     msg.payload.config.offset = 0;
     msg.payload.config.size = config_len;
     if (vhost_user_write(dev, &msg, NULL, 0) < 0) {
-        return -1;
+        return -EPROTO;
     }
 
     if (vhost_user_read(dev, &msg) < 0) {
-        return -1;
+        return -EPROTO;
     }
 
     if (msg.hdr.request != VHOST_USER_GET_CONFIG) {
-        error_report("Received unexpected msg type. Expected %d received %d",
-                     VHOST_USER_GET_CONFIG, msg.hdr.request);
-        return -1;
+        error_setg(errp,
+                   "Received unexpected msg type. Expected %d received %d",
+                   VHOST_USER_GET_CONFIG, msg.hdr.request);
+        return -EINVAL;
     }
 
     if (msg.hdr.size != VHOST_USER_CONFIG_HDR_SIZE + config_len) {
-        error_report("Received bad msg size.");
-        return -1;
+        error_setg(errp, "Received bad msg size.");
+        return -EINVAL;
     }
 
     memcpy(config, msg.payload.config.region, config_len);