diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index da1d1d4080..e54227f920 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -847,6 +847,75 @@ qemuGetSharedDiskKey(const char *disk_path)
     return key;
 }
 
+/* Check if a shared disk's setting conflicts with the conf
+ * used by other domain(s). Currently only checks the sgio
+ * setting. Note that this should only be called for disk with
+ * block source.
+ *
+ * Returns 0 if no conflicts, otherwise returns -1.
+ */
+static int
+qemuCheckSharedDisk(virHashTablePtr sharedDisks,
+                    virDomainDiskDefPtr disk)
+{
+    int val;
+    size_t *ref = NULL;
+    char *sysfs_path = NULL;
+    char *key = NULL;
+    int ret = 0;
+
+    /* The only conflicts between shared disk we care about now
+     * is sgio setting, which is only valid for device='lun'.
+     */
+    if (disk->device != VIR_DOMAIN_DISK_DEVICE_LUN)
+        return 0;
+
+    if (!(sysfs_path = virGetUnprivSGIOSysfsPath(disk->src, NULL))) {
+        ret = -1;
+        goto cleanup;
+    }
+
+    /* It can't be conflict if unpriv_sgio is not supported
+     * by kernel.
+     */
+    if (!virFileExists(sysfs_path))
+        goto cleanup;
+
+
+    if (!(key = qemuGetSharedDiskKey(disk->src))) {
+        ret = -1;
+        goto cleanup;
+    }
+
+    /* It can't be conflict if no other domain is
+     * is sharing it.
+     */
+    if (!(ref = virHashLookup(sharedDisks, key)))
+        goto cleanup;
+
+    if (virGetDeviceUnprivSGIO(disk->src, NULL, &val) < 0) {
+        ret = -1;
+        goto cleanup;
+    }
+
+    if ((val == 0 &&
+         (disk->sgio == VIR_DOMAIN_DISK_SGIO_FILTERED ||
+          disk->sgio == VIR_DOMAIN_DISK_SGIO_DEFAULT)) ||
+        (val == 1 &&
+         disk->sgio == VIR_DOMAIN_DISK_SGIO_UNFILTERED))
+        goto cleanup;
+
+    virReportError(VIR_ERR_OPERATION_INVALID,
+                   _("sgio of shared disk '%s' conflicts with other "
+                     "active domains"), disk->src);
+    ret = -1;
+
+cleanup:
+    VIR_FREE(sysfs_path);
+    VIR_FREE(key);
+    return ret;
+}
+
 /* Increase ref count if the entry already exists, otherwise
  * add a new entry.
  */
@@ -867,6 +936,9 @@ qemuAddSharedDisk(virQEMUDriverPtr driver,
         return 0;
 
     qemuDriverLock(driver);
+    if (qemuCheckSharedDisk(driver->sharedDisks, disk) < 0)
+        goto cleanup;
+
     if (!(key = qemuGetSharedDiskKey(disk->src)))
         goto cleanup;
 
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 65ab81f75e..813411db2f 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5714,11 +5714,6 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
         goto end;
     }
 
-    if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK &&
-        disk->shared &&
-        (qemuCheckSharedDisk(driver, disk) < 0))
-        goto end;
-
     if (qemuDomainDetermineDiskChain(driver, disk, false) < 0)
         goto end;
 
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index f80fe67703..a925d61d97 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3477,56 +3477,6 @@ qemuSetUnprivSGIO(virDomainDiskDefPtr disk)
     return 0;
 }
 
-/* Check if a shared disk's setting conflicts with the conf
- * used by other domain(s). Currently only checks the sgio
- * setting. Note that this should only be called for disk with
- * block source.
- *
- * Returns 0 if no conflicts, otherwise returns -1.
- */
-int
-qemuCheckSharedDisk(virQEMUDriverPtr driver,
-                    virDomainDiskDefPtr disk)
-{
-    int val;
-    size_t *ref = NULL;
-    char *key = NULL;
-    int ret = 0;
-
-    if (!(key = qemuGetSharedDiskKey(disk->src)))
-        return -1;
-
-    /* It can't be conflict if no other domain is
-     * is sharing it.
-     */
-    if (!(ref = virHashLookup(driver->sharedDisks, key)))
-        goto cleanup;
-
-    if (ref == (void *)0x1)
-        goto cleanup;
-
-    if (virGetDeviceUnprivSGIO(disk->src, NULL, &val) < 0) {
-        ret = -1;
-        goto cleanup;
-    }
-
-    if ((val == 0 &&
-         (disk->sgio == VIR_DOMAIN_DISK_SGIO_FILTERED ||
-          disk->sgio == VIR_DOMAIN_DISK_SGIO_DEFAULT)) ||
-        (val == 1 &&
-         disk->sgio == VIR_DOMAIN_DISK_SGIO_UNFILTERED))
-        goto cleanup;
-
-    virReportError(VIR_ERR_OPERATION_INVALID,
-                   _("sgio of shared disk '%s' conflicts with other "
-                     "active domains"), disk->src);
-    ret = -1;
-
-cleanup:
-    VIR_FREE(key);
-    return ret;
-}
-
 int qemuProcessStart(virConnectPtr conn,
                      virQEMUDriverPtr driver,
                      virDomainObjPtr vm,
@@ -3883,9 +3833,6 @@ int qemuProcessStart(virConnectPtr conn,
         if (qemuAddSharedDisk(driver, disk) < 0)
             goto cleanup;
 
-        if (qemuCheckSharedDisk(driver, disk) < 0)
-            goto cleanup;
-
         if (qemuSetUnprivSGIO(disk) < 0)
             goto cleanup;
     }
diff --git a/src/qemu/qemu_process.h b/src/qemu/qemu_process.h
index ce44fe5a37..bc4d54db42 100644
--- a/src/qemu/qemu_process.h
+++ b/src/qemu/qemu_process.h
@@ -99,7 +99,4 @@ virBitmapPtr qemuPrepareCpumap(virQEMUDriverPtr driver,
                                virBitmapPtr nodemask);
 int qemuSetUnprivSGIO(virDomainDiskDefPtr disk);
 
-int qemuCheckSharedDisk(virQEMUDriverPtr driver,
-                        virDomainDiskDefPtr disk);
-
 #endif /* __QEMU_PROCESS_H__ */