[PATCH for 8.0 7/8] cryptodev-builtin: Detect akcipher capability

[zhenwei pi]

Rather than exposing akcipher service/RSA algorithm to virtio crypto
device unconditionally, detect akcipher capability from akcipher
crypto framework. This avoids unsuccessful requests.

Signed-off-by: zhenwei pi <pizhen...@bytedance.com>
---
 backends/cryptodev-builtin.c | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/backends/cryptodev-builtin.c b/backends/cryptodev-builtin.c
index a548c66e39..9e94d2bfcc 100644
--- a/backends/cryptodev-builtin.c
+++ b/backends/cryptodev-builtin.c
@@ -59,6 +59,25 @@ struct CryptoDevBackendBuiltin {
     CryptoDevBackendBuiltinSession *sessions[MAX_NUM_SESSIONS];
 };
 
+static void cryptodev_builtin_init_akcipher(CryptoDevBackend *backend)
+{
+    QCryptoAkCipherOptions opts;
+    bool supported = false;
+
+    opts.alg = QCRYPTO_AKCIPHER_ALG_RSA;
+    opts.u.rsa.padding_alg = QCRYPTO_RSA_PADDING_ALG_RAW;
+    if (qcrypto_akcipher_supports(&opts)) {
+        backend->conf.crypto_services |=
+                     (1u << QCRYPTODEV_BACKEND_SERVICE_AKCIPHER);
+        backend->conf.akcipher_algo = 1u << VIRTIO_CRYPTO_AKCIPHER_RSA;
+        supported = true;
+    }
+
+    if (supported) {
+        backend->asym_stat = g_new0(QCryptodevBackendAsymStat, 1);
+    }
+}
+
 static void cryptodev_builtin_init(
              CryptoDevBackend *backend, Error **errp)
 {
@@ -81,11 +100,9 @@ static void cryptodev_builtin_init(
     backend->conf.crypto_services =
                          1u << QCRYPTODEV_BACKEND_SERVICE_CIPHER |
                          1u << QCRYPTODEV_BACKEND_SERVICE_HASH |
-                         1u << QCRYPTODEV_BACKEND_SERVICE_MAC |
-                         1u << QCRYPTODEV_BACKEND_SERVICE_AKCIPHER;
+                         1u << QCRYPTODEV_BACKEND_SERVICE_MAC;
     backend->conf.cipher_algo_l = 1u << VIRTIO_CRYPTO_CIPHER_AES_CBC;
     backend->conf.hash_algo = 1u << VIRTIO_CRYPTO_HASH_SHA1;
-    backend->conf.akcipher_algo = 1u << VIRTIO_CRYPTO_AKCIPHER_RSA;
     /*
      * Set the Maximum length of crypto request.
      * Why this value? Just avoid to overflow when
@@ -96,7 +113,7 @@ static void cryptodev_builtin_init(
     backend->conf.max_auth_key_len = CRYPTODEV_BUITLIN_MAX_AUTH_KEY_LEN;
 
     backend->sym_stat = g_new0(QCryptodevBackendSymStat, 1);
-    backend->asym_stat = g_new0(QCryptodevBackendAsymStat, 1);
+    cryptodev_builtin_init_akcipher(backend);
 
     cryptodev_backend_set_ready(backend, true);
 }
-- 
2.20.1