[PATCH RFC v2 12/13] backends/cryptodev-vhost-user: add memory isolation bool

[Connor Kite <connorkite@gmail.com>]

Add a memory_isolation property to CryptoDevBackendVhostUser and
add add it as an optional member of CryptodevVhostUserProperties
in qapi.

This is needed to be able to specify memory isolation for
cryptodev-vhost-user objects, and the bool will eventually be
passed to vhost_user_init() in a future patch.

Signed-off-by: Connor Kite <connorkite@gmail.com>
---
 backends/cryptodev-vhost-user.c | 28 +++++++++++++++++++++++++++-
 qapi/qom.json                   |  8 +++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/backends/cryptodev-vhost-user.c b/backends/cryptodev-vhost-user.c
index fa1f9b76d3..be8631446b 100644
--- a/backends/cryptodev-vhost-user.c
+++ b/backends/cryptodev-vhost-user.c
@@ -49,6 +49,7 @@ struct CryptoDevBackendVhostUser {
     CharFrontend chr;
     char *chr_name;
     bool opened;
+    bool memory_isolation;
     CryptoDevBackendVhost *vhost_crypto[MAX_CRYPTO_QUEUE_NUM];
 };
 
@@ -213,7 +214,7 @@ static void cryptodev_vhost_user_init(
         }
     }
 
-    if (!vhost_user_init(&s->vhost_user, &s->chr, false, errp)) {
+    if (!vhost_user_init(&s->vhost_user, &s->chr, s->memory_isolation, errp)) {
         return;
     }
 
@@ -392,6 +393,27 @@ static void cryptodev_vhost_user_finalize(Object *obj)
     g_free(s->chr_name);
 }
 
+static void cryptodev_vhost_user_set_mem_isolation(Object *obj, bool value,
+                                                   Error **errp)
+{
+    CryptoDevBackendVhostUser *s =
+                      CRYPTODEV_BACKEND_VHOST_USER(obj);
+
+    if (s->opened) {
+        error_setg(errp, "Property 'memory-isolation' can no longer be set");
+    } else{
+        s->memory_isolation = value;
+    }
+}
+
+static bool cryptodev_vhost_user_get_mem_isolation(Object *obj, Error **errp)
+{
+    CryptoDevBackendVhostUser *s =
+                      CRYPTODEV_BACKEND_VHOST_USER(obj);
+
+    return s->memory_isolation;
+}
+
 static void
 cryptodev_vhost_user_class_init(ObjectClass *oc, const void *data)
 {
@@ -407,6 +429,10 @@ cryptodev_vhost_user_class_init(ObjectClass *oc, const void *data)
                                   cryptodev_vhost_user_get_chardev,
                                   cryptodev_vhost_user_set_chardev);
 
+    object_class_property_add_bool(oc, "memory-isolation",
+                                   cryptodev_vhost_user_get_mem_isolation,
+                                   cryptodev_vhost_user_set_mem_isolation);
+
 }
 
 static const TypeInfo cryptodev_vhost_user_info = {
diff --git a/qapi/qom.json b/qapi/qom.json
index c55776af7d..1024027195 100644
--- a/qapi/qom.json
+++ b/qapi/qom.json
@@ -350,11 +350,17 @@
 # @chardev: the name of a Unix domain socket character device that
 #     connects to the vhost-user server
 #
+# @memory-isolation: disable direct access from vhost-user back-end
+#     to guest memory.  The back-end will instead access data via
+#     bounce buffers residing in the QEMU virtual address space.
+#     (default: false) (Since 11.2)
+#
 # Since: 2.12
 ##
 { 'struct': 'CryptodevVhostUserProperties',
   'base': 'CryptodevBackendProperties',
-  'data': { 'chardev': 'str' },
+  'data': { 'chardev': 'str',
+            '*memory-isolation': 'bool' },
   'if': 'CONFIG_VHOST_CRYPTO' }
 
 ##

-- 
2.43.0