quoted

  /* The accelerator hardware is ready */  #define
VIRTIO_CRYPTO_S_HW_READY  (1 << 0) @@ -442,6 +520,7 @@ struct
virtio_crypto_config {
  	__le32 reserve;
  	/* Maximum size of each crypto request's content */
  	__le64 max_size;
+	__le32 akcipher_algo;
  };

You can use the reserve attribute. Keeping 64-bit aligned.

quoted

  struct virtio_crypto_inhdr {
--
2.25.1

Can I use the "__le32 reserve;" field directly?

struct virtio_crypto_config {
         /* See VIRTIO_CRYPTO_OP_* above */
         __le32  status;

         /*
          * Maximum number of data queue
          */
         __le32  max_dataqueues;

         /*
          * Specifies the services mask which the device support,
          * see VIRTIO_CRYPTO_SERVICE_* above
          */
         __le32 crypto_services;

         /* Detailed algorithms mask */
         __le32 cipher_algo_l;
         __le32 cipher_algo_h;
         __le32 hash_algo;
         __le32 mac_algo_l;
         __le32 mac_algo_h;
         __le32 aead_algo;
         /* Maximum length of cipher key */
         __le32 max_cipher_key_len;
         /* Maximum length of authenticated key */
         __le32 max_auth_key_len;
         __le32 reserve;            -->    __le32 akcipher_algo;
         /* Maximum size of each crypto request's content */
         __le64 max_size;
};

-- 
zhenwei pi
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