-.. BSD LICENSE
- Copyright(c) 2010-2016 Intel Corporation. All rights reserved.
- All rights reserved.
-
- Redistribution and use in source and binary forms, with or without
- modification, are permitted provided that the following conditions
- are met:
-
- * Redistributions of source code must retain the above copyright
- notice, this list of conditions and the following disclaimer.
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- notice, this list of conditions and the following disclaimer in
- the documentation and/or other materials provided with the
- distribution.
- * Neither the name of Intel Corporation nor the names of its
- contributors may be used to endorse or promote products derived
- from this software without specific prior written permission.
-
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+.. SPDX-License-Identifier: BSD-3-Clause
+ Copyright(c) 2010-2016 Intel Corporation.
Vhost Library
=============
of those segments, thus the fewer the segments, the quicker we will get
the mapping. NOTE: we may speed it by using tree searching in future.
+ - ``RTE_VHOST_USER_IOMMU_SUPPORT``
+
+ IOMMU support will be enabled when this flag is set. It is disabled by
+ default.
+
+ Enabling this flag makes possible to use guest vIOMMU to protect vhost
+ from accessing memory the virtio device isn't allowed to, when the feature
+ is negotiated and an IOMMU device is declared.
+
+ However, this feature enables vhost-user's reply-ack protocol feature,
+ which implementation is buggy in Qemu v2.7.0-v2.9.0 when doing multiqueue.
+ Enabling this flag with these Qemu version results in Qemu being blocked
+ when multiple queue pairs are declared.
+
* ``rte_vhost_driver_set_features(path, features)``
This function sets the feature bits the vhost-user driver supports. The