Now we have a QMP command to query crypto devices:
virsh qemu-monitor-command vm '{"execute": "query-cryptodev"}' | jq
{
  "return": [
    {
      "service": [
        "akcipher",
        "mac",
        "hash",
        "cipher"
      ],
      "id": "cryptodev1",
      "client": [
        {
          "queue": 0,
          "type": "builtin",
          "info": "cryptodev-builtin0"
        }
      ]
    },
    {
      "service": [
        "akcipher"
      ],
      "id": "cryptodev0",
      "client": [
        {
          "queue": 0,
          "type": "lkcf",
          "info": "cryptodev-lkcf0"
        }
      ]
    }
  ],
  "id": "libvirt-415"
}

Signed-off-by: zhenwei pi <pizhen...@bytedance.com>
---
 backends/cryptodev.c | 49 ++++++++++++++++++++++++++++++++++++++++++++
 qapi/cryptodev.json  | 43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 92 insertions(+)

diff --git a/backends/cryptodev.c b/backends/cryptodev.c
index d3caded920..bf2f3234c9 100644
--- a/backends/cryptodev.c
+++ b/backends/cryptodev.c
@@ -24,6 +24,7 @@
 #include "qemu/osdep.h"
 #include "sysemu/cryptodev.h"
 #include "qapi/error.h"
+#include "qapi/qapi-commands-cryptodev.h"
 #include "qapi/visitor.h"
 #include "qemu/config-file.h"
 #include "qemu/error-report.h"
@@ -33,6 +34,54 @@
 
 static QTAILQ_HEAD(, CryptoDevBackendClient) crypto_clients;
 
+static int qmp_query_cryptodev_foreach(Object *obj, void *data)
+{
+    CryptoDevBackend *backend;
+    CryptodevInfoList **infolist = data;
+    uint32_t services;
+
+    if (!object_dynamic_cast(obj, TYPE_CRYPTODEV_BACKEND)) {
+        return 0;
+    }
+
+    CryptodevInfo *info = g_new0(CryptodevInfo, 1);
+    info->id = g_strdup(object_get_canonical_path_component(obj));
+
+    backend = CRYPTODEV_BACKEND(obj);
+    services = backend->conf.crypto_services;
+    for (uint32_t i = 0; i < QCRYPTODEV_BACKEND_SERVICE__MAX; i++) {
+        if (services & (1 << i)) {
+            QAPI_LIST_PREPEND(info->service, i);
+        }
+    }
+
+    for (uint32_t i = 0; i < backend->conf.peers.queues; i++) {
+        CryptoDevBackendClient *cc = backend->conf.peers.ccs[i];
+        CryptodevBackendClient *client = g_new0(CryptodevBackendClient, 1);
+
+        client->queue = cc->queue_index;
+        client->type = cc->type;
+        if (cc->info_str) {
+            client->has_info = true;
+            client->info = strdup(cc->info_str);
+        }
+        QAPI_LIST_PREPEND(info->client, client);
+    }
+
+    QAPI_LIST_PREPEND(*infolist, info);
+
+    return 0;
+}
+
+CryptodevInfoList *qmp_query_cryptodev(Error **errp)
+{
+    CryptodevInfoList *list = NULL;
+    Object *objs = container_get(object_get_root(), "/objects");
+
+    object_child_foreach(objs, qmp_query_cryptodev_foreach, &list);
+
+    return list;
+}
 
 CryptoDevBackendClient *cryptodev_backend_new_client(void)
 {
diff --git a/qapi/cryptodev.json b/qapi/cryptodev.json
index 8732a30524..4cc4f4f0ed 100644
--- a/qapi/cryptodev.json
+++ b/qapi/cryptodev.json
@@ -43,3 +43,46 @@
 { 'enum': 'QCryptodevBackendType',
   'prefix': 'QCRYPTODEV_BACKEND_TYPE',
   'data': ['builtin', 'vhost-user', 'lkcf']}
+
+##
+# @CryptodevBackendClient:
+#
+# Information about a queue of crypto device.
+#
+# @type: the type of the crypto device
+#
+# @info: the additional infomation of the crypto device
+#
+# Since: 8.0
+##
+{ 'struct': 'CryptodevBackendClient',
+  'data': { 'queue': 'int',
+            'type': 'QCryptodevBackendType',
+            '*info': 'str' } }
+
+##
+# @CryptodevInfo:
+#
+# Information about a crypto device.
+#
+# @service: supported service types of a crypto device
+#
+# @client: the additional infomation of the crypto device
+#
+# Since: 8.0
+##
+{ 'struct': 'CryptodevInfo',
+  'data': { 'id': 'str',
+            'service': ['QCryptodevBackendServiceType'],
+            'client': ['CryptodevBackendClient'] } }
+
+##
+# @query-cryptodev:
+#
+# Returns information about current crypto devices.
+#
+# Returns: a list of @CryptodevInfo
+#
+# Since: 8.0
+##
+{ 'command': 'query-cryptodev', 'returns': ['CryptodevInfo']}
-- 
2.20.1


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