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Subject: [PATCH v10 1/2] virtio-crypto: Add virtio crypto device specification
The virtio crypto device is a virtual crypto device (ie. hardware
crypto accelerator card). The virtio crypto device can provide
five crypto services: CIPHER, MAC, HASH, AEAD, KDF, ASYM, PRIMITIVE.
In this patch, CIPHER, MAC, HASH, AEAD services are introduced.
Signed-off-by: Gonglei <arei.gonglei@huawei.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Cornelia Huck <cornelia.huck@de.ibm.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Lingli Deng <denglingli@chinamobile.com>
CC: Jani Kokkonen <Jani.Kokkonen@huawei.com>
CC: Ola Liljedahl <Ola.Liljedahl@arm.com>
CC: Varun Sethi <Varun.Sethi@freescale.com>
CC: Zeng Xin <xin.zeng@intel.com>
CC: Keating Brian <brian.a.keating@intel.com>
CC: Ma Liang J <liang.j.ma@intel.com>
CC: Griffin John <john.griffin@intel.com>
CC: Hanweidong <hanweidong@huawei.com>
CC: Mihai Claudiu Caraman <mike.caraman@nxp.com>
---
content.tex | 2 +
virtio-crypto.tex | 942 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 944 insertions(+)
create mode 100644 virtio-crypto.tex
diff --git a/content.tex b/content.tex
index 4b45678..ab75f78 100644
--- a/content.tex
+++ b/content.tex
@@ -5750,6 +5750,8 @@ descriptor for the \field{sense_len}, \field{residual},
\field{status_qualifier}, \field{status}, \field{response} and
\field{sense} fields.
+\input{virtio-crypto.tex}
+
\chapter{Reserved Feature Bits}\label{sec:Reserved Feature Bits}
Currently there are three device-independent feature bits defined:
diff --git a/virtio-crypto.tex b/virtio-crypto.tex
new file mode 100644
index 0000000..ac1fc0a
--- /dev/null
+++ b/virtio-crypto.tex
@@ -0,0 +1,942 @@
+\section{Crypto Device}\label{sec:Device Types / Crypto Device}
+
+The virtio crypto device is a virtual cryptography device as well as a kind of
+virtual hardware accelerator for virtual machines. The encryption and
+decryption requests are placed in the data queue and are ultimately handled by the
+real crypto accelerators. The second queue is the control queue used to create
+or destroy sessions for symmetric algorithms and will control some advanced
+features in the future. The virtio crypto device provides seven crypto
+services: CIPHER, MAC, HASH, AEAD, KDF, ASYM, and PRIMITIVE.
+
+
+\subsection{Device ID}\label{sec:Device Types / Crypto Device / Device ID}
+
+20
+
+\subsection{Virtqueues}\label{sec:Device Types / Crypto Device / Virtqueues}
+
+\begin{description}
+\item[0] dataq1
+\item[\ldots]
+\item[N-1] dataqN
+\item[N] controlq
+\end{description}
+
+N is set by \field{max_dataqueues}.
+
+\subsection{Feature bits}\label{sec:Device Types / Crypto Device / Feature bits}
+ None currently defined
+
+\subsection{Device configuration layout}\label{sec:Device Types / Crypto Device / Device configuration layout}
+
+The following driver-read-only configuration fields are defined:
+
+\begin{lstlisting}
+struct virtio_crypto_config {
+ le32 status;
+ le32 max_dataqueues;
+ 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 asym_algo;
+ le32 kdf_algo;
+ le32 aead_algo;
+ le32 primitive_algo;
+};
+\end{lstlisting}
+
+In the \field{status}, the value of the field is VIRTIO_CRYPTO_S_HW_READY or VIRTIO_CRYPTO_S_STARTED.
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_S_HW_READY (1 << 0)
+#define VIRTIO_CRYPTO_S_STARTED (1 << 1)
+\end{lstlisting}
+
+The following driver-read-only fields include \field{max_dataqueues}, which specifies the
+maximum number of data virtqueues (dataq1\ldots dataqN), and \field{crypto_services},
+which indicates the crypto service the virtio crypto supports.
+
+The following services are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_SERVICE_CIPHER (0) /* CIPHER service */
+#define VIRTIO_CRYPTO_SERVICE_HASH (1) /* HASH service */
+#define VIRTIO_CRYPTO_SERVICE_MAC (2) /* MAC (Message Authentication Codes) service */
+#define VIRTIO_CRYPTO_SERVICE_AEAD (3) /* AEAD (Authenticated Encryption with Associated Data) service */
+\end{lstlisting}
+
+The last driver-read-only fields specify detailed algorithms masks
+the device offers for corresponding services. The following CIPHER algorithms
+are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_CIPHER 0
+#define VIRTIO_CRYPTO_CIPHER_ARC4 1
+#define VIRTIO_CRYPTO_CIPHER_AES_ECB 2
+#define VIRTIO_CRYPTO_CIPHER_AES_CBC 3
+#define VIRTIO_CRYPTO_CIPHER_AES_CTR 4
+#define VIRTIO_CRYPTO_CIPHER_DES_ECB 5
+#define VIRTIO_CRYPTO_CIPHER_DES_CBC 6
+#define VIRTIO_CRYPTO_CIPHER_3DES_ECB 7
+#define VIRTIO_CRYPTO_CIPHER_3DES_CBC 8
+#define VIRTIO_CRYPTO_CIPHER_3DES_CTR 9
+#define VIRTIO_CRYPTO_CIPHER_KASUMI_F8 10
+#define VIRTIO_CRYPTO_CIPHER_SNOW3G_UEA2 11
+#define VIRTIO_CRYPTO_CIPHER_AES_F8 12
+#define VIRTIO_CRYPTO_CIPHER_AES_XTS 13
+#define VIRTIO_CRYPTO_CIPHER_ZUC_EEA3 14
+\end{lstlisting}
+
+The following HASH algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_HASH 0
+#define VIRTIO_CRYPTO_HASH_MD5 1
+#define VIRTIO_CRYPTO_HASH_SHA1 2
+#define VIRTIO_CRYPTO_HASH_SHA_224 3
+#define VIRTIO_CRYPTO_HASH_SHA_256 4
+#define VIRTIO_CRYPTO_HASH_SHA_384 5
+#define VIRTIO_CRYPTO_HASH_SHA_512 6
+#define VIRTIO_CRYPTO_HASH_SHA3_224 7
+#define VIRTIO_CRYPTO_HASH_SHA3_256 8
+#define VIRTIO_CRYPTO_HASH_SHA3_384 9
+#define VIRTIO_CRYPTO_HASH_SHA3_512 10
+#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE128 11
+#define VIRTIO_CRYPTO_HASH_SHA3_SHAKE256 12
+\end{lstlisting}
+
+The following MAC algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_MAC 0
+#define VIRTIO_CRYPTO_MAC_HMAC_MD5 1
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA1 2
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_224 3
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_256 4
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_384 5
+#define VIRTIO_CRYPTO_MAC_HMAC_SHA_512 6
+#define VIRTIO_CRYPTO_MAC_CMAC_3DES 25
+#define VIRTIO_CRYPTO_MAC_CMAC_AES 26
+#define VIRTIO_CRYPTO_MAC_KASUMI_F9 27
+#define VIRTIO_CRYPTO_MAC_SNOW3G_UIA2 28
+#define VIRTIO_CRYPTO_MAC_GMAC_AES 41
+#define VIRTIO_CRYPTO_MAC_GMAC_TWOFISH 42
+#define VIRTIO_CRYPTO_MAC_CBCMAC_AES 49
+#define VIRTIO_CRYPTO_MAC_CBCMAC_KASUMI_F9 50
+#define VIRTIO_CRYPTO_MAC_XCBC_AES 53
+#define VIRTIO_CRYPTO_MAC_ZUC_EIA3 54
+\end{lstlisting}
+
+The following AEAD algorithms are defined:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_NO_AEAD 0
+#define VIRTIO_CRYPTO_AEAD_GCM 1
+#define VIRTIO_CRYPTO_AEAD_CCM 2
+#define VIRTIO_CRYPTO_AEAD_CHACHA20_POLY1305 3
+\end{lstlisting}
+
+\begin{note}
+More algorithms will be defined in the future.
+\end{note}
+
+\devicenormative{\subsubsection}{Device configuration layout}{Device Types / Crypto Device / Device configuration layout}
+
+\begin{itemize*}
+\item The device MUST set \field{max_dataqueues} to between 1 and 65535 inclusive.
+\item The device MUST set \field{status} based on the status of the hardware-backed implementation.
+ If the backend crypto accelerator is ready for work, then set the ready \field{status} to VIRTIO_CRYPTO_S_HW_READY.
+\item The device MUST set \field{crypto_services} based on the crypto services the device offer.
+\item The device MUST set detailed algorithms masks based on the \field{crypto_services} field.
+\end{itemize*}
+
+\drivernormative{\subsubsection}{Device configuration layout}{Device Types / Crypto Device / Device configuration layout}
+
+\begin{itemize*}
+\item The driver MUST read the ready \field{status} from the bottom bit of status to check whether the hardware-backed
+ implementation is ready or not, and the driver MUST reread it after the device reset.
+\item The driver MUST NOT transmit any packets to the device if the ready \filed{status} is not set.
+\item The driver MAY read \field{max_dataqueues} field to discover the number of data queues the device supports.
+\item The driver MUST read \field{crypto_services} field to discover which services the device is able to offer.
+\item The driver MUST read the detailed algorithms fields based on \field{crypto_services} field.
+\end{itemize*}
+
+\subsection{Device Initialization}\label{sec:Device Types / Crypto Device / Device Initialization}
+
+\drivernormative{\subsubsection}{Device Initialization}{Device Types / Crypto Device / Device Initialization}
+
+\begin{itemize*}
+\item The driver MUST identify and initialize the control virtqueue.
+\item The driver MUST read the supported crypto services from bits of \field{crypto_servies}.
+\item The driver MUST read the supported algorithms based on \field{crypto_services} field.
+\end{itemize*}
+
+\devicenormative{\subsubsection}{Device Initialization}{Device Types / Crypto Device / Device Initialization}
+
+\begin{itemize*}
+\item The device MUST be configured with at least one accelerator which executes real crypto operations.
+\item The device MUST write the \field{crypto_services} field based on the capacities of the backend accelerator.
+\end{itemize*}
+
+\subsection{Device Operation}\label{sec:Device Types / Crypto Device / Device Operation}
+
+Packets can be transmitted by placing them in both the controlq and dataq.
+Packets consist of a general header and a service-specific request.
+Where 'general header' is for all crypto requests, and 'service specific requests'
+are composed of operation parameter + output data + input data in general.
+Operation parameters are algorithm-specific parameters, output data is the
+data that should be utilized in operations, and input data is equal to
+"operation result + result buffer".
+
+The general header for controlq is as follows:
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_OPCODE(service, op) ((service << 8) | (op))
+
+struct virtio_crypto_ctrl_header {
+#define VIRTIO_CRYPTO_CIPHER_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x02)
+#define VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x03)
+#define VIRTIO_CRYPTO_HASH_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x02)
+#define VIRTIO_CRYPTO_HASH_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x03)
+#define VIRTIO_CRYPTO_MAC_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x02)
+#define VIRTIO_CRYPTO_MAC_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x03)
+#define VIRTIO_CRYPTO_AEAD_CREATE_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x02)
+#define VIRTIO_CRYPTO_AEAD_DESTROY_SESSION \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x03)
+ le32 opcode;
+ le32 algo;
+ le32 flag;
+ /* data virtqueue id */
+ le32 queue_id;
+};
+\end{lstlisting}
+
+The general header of dataq:
+
+\begin{lstlisting}
+struct virtio_crypto_op_header {
+#define VIRTIO_CRYPTO_CIPHER_ENCRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x00)
+#define VIRTIO_CRYPTO_CIPHER_DECRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_CIPHER, 0x01)
+#define VIRTIO_CRYPTO_HASH \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_HASH, 0x00)
+#define VIRTIO_CRYPTO_MAC \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_MAC, 0x00)
+#define VIRTIO_CRYPTO_AEAD_ENCRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x00)
+#define VIRTIO_CRYPTO_AEAD_DECRYPT \
+ VIRTIO_CRYPTO_OPCODE(VIRTIO_CRYPTO_SERVICE_AEAD, 0x01)
+ le32 opcode;
+ /* algo should be service-specific algorithms */
+ le32 algo;
+ /* session_id should be service-specific algorithms */
+ le64 session_id;
+ /* control flag to control the request */
+ le32 flag;
+ le32 padding;
+};
+\end{lstlisting}
+
+The device can set the operation status as follows: VIRTIO_CRYPTO_OP_OK: success;
+VIRTIO_CRYPTO_OP_ERR: failure or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not supported;
+VIRTIO_CRYPTO_OP_INVSESS: invalid session ID when executing crypto operations.
+
+\begin{lstlisting}
+#define VIRTIO_CRYPTO_OP_OK 0
+#define VIRTIO_CRYPTO_OP_ERR 1
+#define VIRTIO_CRYPTO_OP_BADMSG 2
+#define VIRTIO_CRYPTO_OP_NOTSUPP 3
+#define VIRTIO_CRYPTO_OP_INVSESS 4
+\end{lstlisting}
+
+\subsubsection{Control Virtqueue}\label{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue}
+
+The driver uses the control virtqueue to send control commands to the
+device which handles the non-data plane operations, such as session
+operations (See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}).
+The packet of controlq:
+
+\begin{lstlisting}
+struct virtio_crypto_op_ctrl_req {
+ struct virtio_crypto_ctrl_header header;
+
+ union {
+ struct virtio_crypto_sym_create_session_req sym_create_session;
+ struct virtio_crypto_hash_create_session_req hash_create_session;
+ struct virtio_crypto_mac_create_session_req mac_create_session;
+ struct virtio_crypto_aead_create_session_req aead_create_session;
+ struct virtio_crypto_destroy_session_req destroy_session;
+ } u;
+};
+\end{lstlisting}
+
+The header is the general header, and the union is of the algorithm-specific type,
+which is set by the driver. All the properties in the union are shown as follows.
+
+\paragraph{Session operation}\label{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation}
+
+The symmetric algorithms involve the concept of sessions. A session is a
+handle which describes the cryptographic parameters to be applied to
+a number of buffers. The data within a session handle includes the following:
+
+\begin{enumerate}
+\item The operation (CIPHER, HASH/MAC or both, and if both, the order in
+ which the algorithms should be applied).
+\item The CIPHER set data, including the CIPHER algorithm and mode,
+ the key and its length, and the direction (encrypt or decrypt).
+\item The HASH/MAC set data, including the HASH algorithm or MAC algorithm,
+ and digest result length (to allow for truncation).
+\begin{itemize*}
+\item Authenticated mode can refer to MAC, which requires that the key and
+ its length are also specified.
+\item For nested mode, the inner and outer prefix data and length are specified,
+ as well as the outer HASH algorithm.
+\end{itemize*}
+\end{enumerate}
+
+The following structure stores the result of session creation set by the device:
+
+\begin{lstlisting}
+struct virtio_crypto_session_input {
+ /* Device-writable part */
+ le64 session_id;
+ le32 status;
+ le32 padding;
+};
+\end{lstlisting}
+
+A request to destroy a session includs the following information:
+
+\begin{lstlisting}
+struct virtio_crypto_destroy_session_req {
+ /* Device-readable part */
+ le64 session_id;
+ /* Device-writable part */
+ le32 status;
+ le32 padding;
+};
+\end{lstlisting}
+
+\subparagraph{Session operation: HASH session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: HASH session}
+
+The packet of HASH session is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_hash_session_para {
+ /* See VIRTIO_CRYPTO_HASH_* above */
+ le32 algo;
+ /* hash result length */
+ le32 hash_result_len;
+};
+struct virtio_crypto_hash_create_session_req {
+ /* Device-readable part */
+ struct virtio_crypto_hash_session_para para;
+ /* Device-writable part */
+ struct virtio_crypto_session_input input;
+};
+\end{lstlisting}
+
+\subparagraph{Session operation: MAC session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: MAC session}
+
+The packet of MAC session is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_mac_session_para {
+ /* See VIRTIO_CRYPTO_MAC_* above */
+ le32 algo;
+ /* hash result length */
+ le32 hash_result_len;
+ /* length of authenticated key */
+ le32 auth_key_len;
+ le32 padding;
+};
+struct virtio_crypto_mac_session_output {
+ le64 auth_key_addr; /* guest key physical address */
+};
+
+struct virtio_crypto_mac_create_session_req {
+ /* Device-readable part */
+ struct virtio_crypto_mac_session_para para;
+ struct virtio_crypto_mac_session_output out;
+ /* Device-writable part */
+ struct virtio_crypto_session_input input;
+};
+\end{lstlisting}
+
+\subparagraph{Session operation: Symmetric algorithms session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: Symmetric algorithms session}
+
+The request of symmetric session includes two parts, CIPHER algorithms and chain
+algorithms (chaining CIPHER and HASH/MAC). The packet for CIPHER session is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_cipher_session_para {
+ /* See VIRTIO_CRYPTO_CIPHER* above */
+ le32 algo;
+ /* length of key */
+ le32 keylen;
+#define VIRTIO_CRYPTO_OP_ENCRYPT 1
+#define VIRTIO_CRYPTO_OP_DECRYPT 2
+ /* encrypt or decrypt */
+ le32 op;
+ le32 padding;
+};
+
+struct virtio_crypto_cipher_session_output {
+ le64 key_addr; /* guest key physical address */
+};
+
+struct virtio_crypto_cipher_session_req {
+ struct virtio_crypto_cipher_session_para para;
+ struct virtio_crypto_cipher_session_output out;
+ struct virtio_crypto_session_input input;
+};
+\end{lstlisting}
+
+The packet for algorithm chaining is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_alg_chain_session_para {
+#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_HASH_THEN_CIPHER 1
+#define VIRTIO_CRYPTO_SYM_ALG_CHAIN_ORDER_CIPHER_THEN_HASH 2
+ le32 alg_chain_order;
+/* Plain hash */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_PLAIN 1
+/* Authenticated hash (mac) */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH 2
+/* Nested hash */
+#define VIRTIO_CRYPTO_SYM_HASH_MODE_NESTED 3
+ le32 hash_mode;
+ struct virtio_crypto_cipher_session_para cipher_param;
+ union {
+ struct virtio_crypto_hash_session_para hash_param;
+ struct virtio_crypto_mac_session_para mac_param;
+ } u;
+ /* length of the additional authenticated data (AAD) in bytes */
+ le32 aad_len;
+ le32 padding;
+};
+
+struct virtio_crypto_alg_chain_session_output {
+ struct virtio_crypto_cipher_session_output cipher;
+ struct virtio_crypto_mac_session_output mac;
+};
+
+struct virtio_crypto_alg_chain_session_req {
+ struct virtio_crypto_alg_chain_session_para para;
+ struct virtio_crypto_alg_chain_session_output out;
+ struct virtio_crypto_session_input input;
+};
+\end{lstlisting}
+
+The packet for symmetric algorithm is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_create_session_req {
+ union {
+ struct virtio_crypto_cipher_session_req cipher;
+ struct virtio_crypto_alg_chain_session_req chain;
+ } u;
+
+ /* Device-readable part */
+
+/* No operation */
+#define VIRTIO_CRYPTO_SYM_OP_NONE 0
+/* Cipher only operation on the data */
+#define VIRTIO_CRYPTO_SYM_OP_CIPHER 1
+/* Chain any cipher with any hash or mac operation. The order
+ depends on the value of alg_chain_order param */
+#define VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING 2
+ le32 op_type;
+ le32 padding;
+};
+\end{lstlisting}
+
+\subparagraph{Session operation: AEAD session}\label{sec:Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: AEAD session}
+
+The packet for AEAD session is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_aead_session_para {
+ /* See VIRTIO_CRYPTO_AEAD_* above*/
+ le32 algo;
+ /* length of key */
+ le32 key_len;
+ /* digest result length */
+ le32 digest_result_len;
+ /* The length of the additional authenticated data (AAD) in bytes */
+ le32 aad_len;
+ /* encrypt or decrypt, See above VIRTIO_CRYPTO_OP_* */
+ le32 op;
+ le32 padding;
+};
+
+struct virtio_crypto_aead_session_output {
+ le64 key_addr; /* guest key phycial address */
+};
+
+struct virtio_crypto_aead_create_session_req {
+ struct virtio_crypto_aead_session_para para;
+ struct virtio_crypto_aead_session_output out;
+ struct virtio_crypto_session_input input;
+};
+\end{lstlisting}
+
+\drivernormative{\subparagraph}{Session operation: create session}{Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation / Session operation: create session}
+
+The driver MUST set the control general header and corresponding properties of the union in structure virtio_crypto_op_ctrl_req. See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue}.
+The driver MUST set \field{opcode} field based on service type: CIPHER, HASH, MAC, or AEAD.
+The driver MUST set \field{queue_id} field to show used dataq.
+
+\devicenormative{\subparagraph}{Session operation: create session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: create session}
+
+The device MUST return a session identifier to the driver when the device finishes processing session creation.
+The device MUST set session creation request ended by \field{status} and \field{session_id} fields.
+
+Both \field{status} and \field{session_id} are written by the device: VIRTIO_CRYPTO_OP_OK: success;
+VIRTIO_CRYPTO_OP_ERR: creation failed or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not supported;
+VIRTIO_CRYPTO_OP_INVSESS: invalid session ID when the crypto operation is implemented.
+
+\drivernormative{\subparagraph}{Session operation: destroy session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: destroy session}
+
+The driver MUST set \field{opcode} field based on service type: CIPHER, HASH, MAC, or AEAD.
+The driver MUST set the \field{session_id} to a valid value which assigned by the device when a session is created.
+
+\devicenormative{\subparagraph}{Session operation: destroy session}{Device Types / Crypto Device / Device
+Operation / Control Virtqueue / Session operation / Session operation: destroy session}
+
+\field{status} field is written by the device: either VIRTIO_CRYPTO_OP_OK for success, VIRTIO_CRYPTO_OP_ERR for failure or device error.
+
+\subsubsection{Data Virtqueue}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue}
+
+The driver uses the data virtqueue to transmit the requests of crypto operation to the device,
+and completes the data plane operations (such as crypto operation).
+
+The packet of dataq is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_op_data_req {
+ struct virtio_crypto_op_header header;
+
+ union {
+ struct virtio_crypto_sym_data_req sym_req;
+ struct virtio_crypto_hash_data_req hash_req;
+ struct virtio_crypto_mac_data_req mac_req;
+ struct virtio_crypto_aead_data_req aead_req;
+ } u;
+};
+\end{lstlisting}
+
+The header is the general header and the union is of the algorithm-specific type,
+which is set by the driver. All properties in the union are shown as follows.
+
+There is a unified idata structure for all symmetric algorithms, including CIPHER, HASH, MAC, and AEAD.
+
+The structure is defined as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_input {
+ /* destination data, it's useless for plain HASH and MAC */
+ struct virtio_crypto_iovec dst_data;
+ /* digest result guest address, it's useless for plain cipher algos */
+ le64 digest_result_addr;
+ /* digest result length which is the same with session para above */
+ le32 digest_result_len;
+
+ le32 status;
+};
+\end{lstlisting}
+
+For scatter/gather chain support, a buffer can be represented by virtio_crypto_iovec structure.
+
+The structure is defined as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_iovec {
+ /* Guest physical address */
+ le64 addr;
+ /* Length of guest physical address */
+ le32 len;
+
+/* This marks a buffer as continuing via the next field */
+#define VIRTIO_CRYPTO_IOVEC_F_NEXT 1
+ /* The flags as indicated above VIRTIO_CRYPTO_IOVEC_F_*. */
+ le32 flags;
+ /* Pointer to next struct virtio_crypto_iovec if flags & NEXT */
+ le64 next_iovec;
+};
+\end{lstlisting}
+
+\paragraph{HASH Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue / HASH Service Operation}
+
+\begin{lstlisting}
+struct virtio_crypto_hash_input {
+ struct virtio_crypto_sym_input input;
+};
+
+struct virtio_crypto_hash_output {
+ /* source data */
+ struct virtio_crypto_iovec src_data;
+ le32 padding;
+};
+
+struct virtio_crypto_hash_data_req {
+ /* Device-readable part */
+ struct virtio_crypto_hash_output odata;
+ /* Device-writable part */
+ struct virtio_crypto_hash_input idata;
+};
+\end{lstlisting}
+
+Each data request uses virtio_crypto_hash_data_req structure to store information
+used to run the HASH operations. The request only occupies one entry
+in the Vring Descriptor Table in the virtio crypto device's dataq, which improves
+the throughput of data transmitted for the HASH service, so that the virtio crypto
+device can be better accelerated.
+
+The information includes the source data guest physical address stored by \field{src_data}.\field{addr},
+length of source data stored by \field{src_data}.\field{len}, and the digest result guest physical address
+stored by \field{digest_result_addr} used to save the results of the HASH operations.
+The address and length can determine the exclusive content in the guest memory.
+
+\begin{note}
+The guest memory is always guaranteed to be allocated and physically-contiguous
+pointed by \field{digest_result_addr} in struct virtio_crypto_hash_input and
+\field{src_data}.\field{addr} in struct virtio_crypto_hash_output is of single buffer.
+If the source data is a scatter/gather chain, then each entry of s/g chain is always guaranteed to be physically-contiguous.
+\end{note}
+
+\drivernormative{\subparagraph}{HASH Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / HASH Service Operation}
+
+The driver MUST set the \field{session_id} in struct virtio_crypto_op_header to a valid value which assigned by the device when a session is created.
+The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_HASH.
+The driver MUST set the \field{queue_id} field to show used dataq in struct virtio_crypto_op_header.
+The driver MUST specify all fields in struct virtio_crypto_hash_data_req, including \field{para}, \field{odata} and \field{idata} sub structures.
+The driver MUST set \field{src_data}.\field{flag} to VIRTIO_CRYPTO_IOVEC_F_NEXT and set the \field{src_data}.\field{next_iovec} if the source data is of a s/g chain.
+The driver MUST set \field{src_data}.\field{flag} to ~VIRTIO_CRYPTO_IOVEC_F_NEXT if it's a single buffer or the last entry of one s/g chain.
+
+\devicenormative{\subparagraph}{HASH Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / HASH Service Operation}
+
+The device MUST copy the results of HASH operations to the guest memory recorded by \field{digest_result_addr} filed in struct virtio_crypto_hash_input.
+The device MUST set \field{status} in strut virtio_crypto_hash_input: VIRTIO_CRYPTO_OP_OK: success; VIRTIO_CRYPTO_OP_ERR: creation failed or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not support.
+
+\paragraph{MAC Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue / MAC Service Operation}
+
+\begin{lstlisting}
+struct virtio_crypto_mac_input {
+ struct virtio_crypto_sym_input input;
+};
+
+struct virtio_crypto_mac_output {
+ struct virtio_crypto_hash_output hash_output;
+};
+
+struct virtio_crypto_mac_data_req {
+ /* Device-readable part */
+ struct virtio_crypto_mac_output odata;
+ /* Device-writable part */
+ struct virtio_crypto_mac_input idata;
+};
+\end{lstlisting}
+
+Each data request uses virtio_crypto_mac_data_req structure to store information
+used to run the MAC operations. The request only occupies one entry
+in the Vring Descriptor Table in the virtio crypto device's dataq, which improves
+the throughput of data transmitted for the MAC service, so that the virtio crypto
+device can get the better result of acceleration.
+
+The information includes the source data guest physical address stored by \field{hash_output}.\field{src_data}.\field{addr},
+the length of source data stored by \field{hash_output}.\field{src_data}.\field{len}, and the digest result guest physical address
+stored by \field{digest_result_addr} used to save the results of the MAC operations.
+The address and length can determine the exclusive content in the guest memory.
+
+\begin{note}
+The guest memory is always guaranteed to be allocated and physically-contiguous
+pointed by \field{digest_result_addr} in struct virtio_crypto_sym_input and
+\field{hash_output}.\field{src_data}.\field{addr} in struct virtio_crypto_mac_output is of single buffer.
+If the source data is a scatter/gather chain, then each entry of s/g chain is always guaranteed to be physically-contiguous.
+\end{note}
+
+\drivernormative{\subparagraph}{MAC Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / MAC Service Operation}
+
+The driver MUST set the \field{session_id} in struct virtio_crypto_op_header to a valid value which assigned by the device when a session is created.
+The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_MAC.
+The driver MUST set the \field{queue_id} field to show used dataq in struct virtio_crypto_op_header.
+The driver MUST specify all fields in struct virtio_crypto_hash_data_req, including \field{para}, \field{odata} and \field{idata} sub structures.
+The driver MUST set \field{hash_output}.\field{src_data}.\field{flag} to VIRTIO_CRYPTO_IOVEC_F_NEXT and set the \field{hash_output}.\field{src_data}.\field{next_iovec} if the source data is of a s/g chain.
+The driver MUST set \field{hash_output}.\field{src_data}.\field{flag} to ~VIRTIO_CRYPTO_IOVEC_F_NEXT if it's a single buffer or the last entry of one s/g chain.
+
+\devicenormative{\subparagraph}{MAC Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / MAC Service Operation}
+
+The device MUST copy the results of MAC operations to the guest memory recorded by \field{digest_result_addr} filed in struct virtio_crypto_mac_input.
+The device MUST set \field{status} in strut virtio_crypto_mac_input: VIRTIO_CRYPTO_OP_OK: success; VIRTIO_CRYPTO_OP_ERR: creation failed or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not support.
+
+\paragraph{Symmetric algorithms Operation}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue / Symmetric algorithms Operation}
+
+The packet of plain CIPHER service is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_cipher_para {
+ le32 iv_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of dst data */
+ le32 dst_data_len;
+ le32 padding;
+};
+
+struct virtio_crypto_cipher_input {
+ struct virtio_crypto_sym_input input;
+};
+
+struct virtio_crypto_cipher_output {
+ /* iv guest address */
+ le64 iv_addr;
+ /* source data */
+ struct virtio_crypto_iovec src_data;
+};
+
+struct virtio_crypto_cipher_data_req {
+ /* Device-readable part */
+ struct virtio_crypto_cipher_para para;
+ struct virtio_crypto_cipher_output odata;
+ /* Device-writable part */
+ struct virtio_crypto_cipher_input idata;
+};
+\end{lstlisting}
+
+The packet of algorithm chaining is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_alg_chain_data_para {
+ struct virtio_crypto_cipher_para cipher;
+};
+
+struct virtio_crypto_alg_chain_data_output {
+ /* Device-writable part */
+ struct virtio_crypto_cipher_output cipher;
+
+ /* Device-readable part */
+ /* additional auth data guest address */
+ struct virtio_crypto_iovec add_data;
+};
+
+struct virtio_crypto_alg_chain_data_input {
+ struct virtio_crypto_sym_input input;
+};
+
+struct virtio_crypto_alg_chain_data_req {
+ /* Device-readable part */
+ struct virtio_crypto_alg_chain_data_para para;
+ struct virtio_crypto_alg_chain_data_output odata;
+ /* Device-writable part */
+ struct virtio_crypto_alg_chain_data_input idata;
+};
+\end{lstlisting}
+
+The packet of symmetric algorithm is as follows:
+
+\begin{lstlisting}
+struct virtio_crypto_sym_data_req {
+ union {
+ struct virtio_crypto_cipher_data_req cipher;
+ struct virtio_crypto_alg_chain_data_req chain;
+ } u;
+
+ /* Device-readable part */
+
+ /* See above VIRTIO_CRYPTO_SYM_OP_* */
+ le32 op_type;
+ le32 padding;
+};
+\end{lstlisting}
+
+Each data request uses the virtio_crypto_cipher_data_req structure to store information
+used to run the CIPHER operations. The request only occupies one entry
+in the Vring Descriptor Table in the virtio crypto device's dataq, which improves
+the throughput of data transmitted for the CIPHER service, so that the virtio crypto
+device can get the better result of acceleration.
+
+In the first virtio_crypto_cipher_para structure, \field{iv_len} specifies the length of the initialization vector,
+\field{src_data_len} specifies the length of the source data, and \field{dst_data_len} specifies the
+length of the destination data.
+
+In the following virtio_crypto_cipher_input structure, \field{dst_data_addr} specifies the destination
+data guest physical address used to store the results of the CIPHER operations, and \field{status} specifies
+the CIPHER operation status. See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation /
+Session operation: create session / Device Requirements: Session operation: create session}.
+
+In the virtio_crypto_cipher_output structure, \field{iv_addr} specifics the guest physical address of initialization vector,
+\field{src_data}.\field{addr} specifics the source data guest physical address.
+
+The addresses and length can determine the exclusive content in the guest memory.
+
+\begin{note}
+The guest memory is always guaranteed to be allocated and physically-contiguous
+pointed by \field{dst_data}.\field{addr} in struct virtio_crypto_cipher_input,
+\field{iv_addr} and \field{src_data}.\field{addr} in struct virtio_crypto_cipher_output is of single buffer.
+If the source data or destination data is a scatter/gather chain, then each entry of s/g chain is always guaranteed to be physically-contiguous.
+\end{note}
+
+\drivernormative{\subparagraph}{Symmetric algorithms Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / Symmetric algorithms Operation}
+
+The driver MUST set the \field{session_id} in struct virtio_crypto_op_header to a valid value which assigned by the device when a session is created.
+The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_CIPHER_ENCRYPT or VIRTIO_CRYPTO_CIPHER_DECRYPT.
+The driver MUST set the \field{queue_id} field to show used dataq in struct virtio_crypto_op_header.
+The driver MUST specify the fields in struct virtio_crypto_sym_data_req, including \field{para}, \field{odata} and \field{idata} sub structures based on the operation type of session.
+The driver MUST specify the fields of struct virtio_crypto_cipher_data_req in struct virtio_crypto_sym_data_req if the created session is based on VIRTIO_CRYPTO_SYM_OP_CIPHER.
+The driver MUST specify the fields of both struct virtio_crypto_cipher_data_req and struct virtio_crypto_mac_data_req in struct virtio_crypto_sym_data_req if the created session
+is of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING type and in the VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH mode.
+The driver MUST set \field{src_data}.\field{flag} to VIRTIO_CRYPTO_IOVEC_F_NEXT and set the \field{src_data}.\field{next_iovec} if the source data is of a s/g chain.
+The driver MUST set \field{src_data}.\field{flag} to ~VIRTIO_CRYPTO_IOVEC_F_NEXT if it's a single buffer or the last entry of one s/g chain.
+
+\devicenormative{\subparagraph}{Symmetric algorithms Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / Symmetric algorithms Operation}
+
+The device MUST parse the virtio_crypto_sym_data_req based on the \field{op_code} in general header.
+The device SHOULD only parse fields of struct virtio_crypto_cipher_data_req in struct virtio_crypto_sym_data_req if the created session is VIRTIO_CRYPTO_SYM_OP_CIPHER type.
+The device MUST parse fields of both struct virtio_crypto_cipher_data_req and struct virtio_crypto_mac_data_req in struct virtio_crypto_sym_data_req if the created
+session is of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING operation type and in the VIRTIO_CRYPTO_SYM_HASH_MODE_AUTH mode.
+The device MUST copy the result of cryptographic operation to the guest memory recorded by \filed{dst_data}.\field{addr} filed in struct virtio_crypto_cipher_input in plain CIPHER mode.
+The device MUST copy the result of HASH/MAC operation to the guest memory recorded by \filed{digest_result_addr} filed in struct virtio_crypto_alg_chain_data_input is of the VIRTIO_CRYPTO_SYM_OP_ALGORITHM_CHAINING type.
+The device MUST set the \filed{status} field in strut virtio_crypto_cipher_input or virtio_crypto_alg_chain_data_input structure:
+VIRTIO_CRYPTO_OP_OK: success; VIRTIO_CRYPTO_OP_ERR: creation failed or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not supported.
+
+\subparagraph{Steps of Operation}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue / Symmetric algorithms Operation / Steps of Operation}
+
+Step1: Create a session:
+\begin{enumerate}
+\item The driver specifies information in struct virtio_crypto_op_ctrl_req, including the algorithm name, key, keylen etc;
+\item The driver adds the request of session creation into the controlq's Vring Descriptor Table;
+\item The driver kicks the device;
+\item The device receives the request from controlq;
+\item The device parses information about the request, and determines the information concerning the backend crypto accelerator;
+\item The device packages information based on the APIs of the backend crypto accelerator;
+\item The device invokes the session creation APIs of the backend crypto accelerator to create a session;
+\item The device returns the session id to the driver.
+\end{enumerate}
+
+Step2: Execute cryptographic operation:
+\begin{enumerate}
+\item The driver specifies information in struct virtio_crypto_op_data_req, including struct virtio_crypto_op_header and struct virtio_crypto_sym_data_req, See \ref{sec:Device Types / Crypto Device / Device
+ Operation / Data Virtqueue / Symmetric algorithms Operation / Driver Requirements: Symmetric algorithms Operation};
+\item The driver adds the request for cryptographic operation into the dataq's Vring Descriptor Table;
+\item The driver kicks the device (Or the device actively polls the dataq's Vring Descriptor Table);
+\item The device receives the request from dataq;
+\item The device parses information about the request, and determines the identification information for the backend crypto accelerator;
+ For example, changing guest physical addresses to host physical addresses.
+\item The device packs identification information based on the API of the backend crypto accelerator;
+\item The device invokes the cryptographic APIs of the backend crypto accelerator;
+\item The backend crypto accelerator executes the cryptographic operation implicitly;
+\item The device receives the cryptographic results from the backend crypto accelerator (synchronous or asynchronous);
+\item The device sets the \field{status} in struct virtio_crypto_cipher_input;
+\item The device updates and flushes the Used Ring to return the cryptographic results to the driver;
+\item The device notifies the driver (Or the driver actively polls the dataq's Used Ring);
+\item The driver saves the cryptographic result.
+\end{enumerate}
+
+\begin{note}
+\begin{itemize*}
+\item The driver MAY support both synchronous and asynchronous cryptographic operation. Then the performance
+ is poor in synchronous operation since frequent context switching and virtualization overhead.
+ The driver should by preference use asynchronous cryptographic operation.
+\item For better performance, the device should by preference use vhost scheme (user space or kernel space)
+ as the backend crypto accelerator in the real production environment.
+\end{itemize*}
+\end{note}
+
+\paragraph{AEAD Service Operation}\label{sec:Device Types / Crypto Device / Device Operation / Data Virtqueue / AEAD Service Operation}
+
+\begin{lstlisting}
+struct virtio_crypto_aead_para {
+ le32 iv_len;
+ /* length of additional auth data */
+ le32 aad_len;
+ /* length of source data */
+ le32 src_data_len;
+ /* length of dst data */
+ le32 dst_data_len;
+};
+
+struct virtio_crypto_aead_input {
+ struct virtio_crypto_sym_input input;
+};
+
+struct virtio_crypto_aead_output {
+ le64 iv_addr; /* iv guest address */
+ /* source data */
+ struct virtio_crypto_iovec src_data;
+ /* additional auth data guest address */
+ struct virtio_crypto_iovec add_data;
+};
+
+struct virtio_crypto_aead_data_req {
+ /* Device-readable part */
+ struct virtio_crypto_aead_para para;
+ struct virtio_crypto_aead_output odata;
+ /* Device-writable part */
+ struct virtio_crypto_aead_input idata;
+};
+\end{lstlisting}
+
+Each data request uses virtio_crypto_aead_data_req structure to store information
+used to implement the CIPHER operations. The request only occupies one entry
+in the Vring Descriptor Table in the virtio crypto device's dataq, which improves
+the throughput of data transmitted for the AEAD service, so that the virtio crypto
+device can be better accelerated.
+
+In the first virtio_crypto_aead_para structure, \field{iv_len} specifies the length of the initialization vector;
+\field{aad_len} specifies the length of additional authentication data, \field{src_data_len} specifies the
+length of the source data; \field{dst_data_len} specifies the length of the destination data.
+
+In the following virtio_crypto_aead_input structure, \field{dst_data}.\field{addr} specifies destination
+data guest physical address used to store the results of the CIPHER operations; \field{digest_result_addr} specifies
+the digest result guest physical address used to store the results of the HASH/MAC operations; \field{status} specifies
+the status of AEAD operation. See \ref{sec:Device Types / Crypto Device / Device Operation / Control Virtqueue / Session operation /
+Session operation: create session / Device Requirements: Session operation: create session}.
+
+In the virtio_crypto_aead_output structure, \field{iv_addr} specifics the guest physical address of initialization vector,
+\field{src_data}.\field{addr} specifics the source data guest physical address, \field{add_data}.\field{addr} specifics the guest physical address
+of additional authentication data.
+
+The addresses and length can determine the exclusive content in the guest memory.
+
+\begin{note}
+The guest memory MUST be guaranteed to be allocated and physically-contiguous
+pointed by \field{dst_data}.\field{addr} and \field{digest_result_addr} in struct virtio_crypto_aead_input,
+\field{iv_addr}, \field{add_data}.\field{addr} and \field{src_data}.\field{addr} in struct virtio_crypto_aead_output is of single buffer.
+If the source data, destination data or additional anthentication data is a scatter/gather chain, then each entry of s/g chain is always guaranteed to be physically-contiguous.
+\end{note}
+
+\drivernormative{\subparagraph}{AEAD Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / AEAD Service Operation}
+
+The driver MUST set the \field{session_id} in struct virtio_crypto_op_header to a valid value which assigned by the device when a session is created.
+The driver MUST set \field{opcode} in struct virtio_crypto_op_header to VIRTIO_CRYPTO_AEAD_ENCRYPT or VIRTIO_CRYPTO_AEAD_DECRYPT.
+The driver MUST set the \field{queue_id} field to show used dataq in struct virtio_crypto_op_header.
+The driver MUST specify the fields in struct virtio_crypto_aead_data_req, including \field{para}, \field{odata} and \field{idata} sub structures.
+The driver MUST set \field{src_data}.\field{flag} to VIRTIO_CRYPTO_IOVEC_F_NEXT and set the \field{src_data}.\field{next_iovec} if the source data is of a s/g chain.
+The driver MUST set \field{src_data}.\field{flag} to ~VIRTIO_CRYPTO_IOVEC_F_NEXT if it's a single buffer or the last entry of one s/g chain.
+
+\devicenormative{\subparagraph}{AEAD Service Operation}{Device Types / Crypto Device / Device Operation / Data Virtqueue / AEAD Service Operation}
+
+The device MUST parse the virtio_crypto_aead_data_req based on the \field{op_code} in general header.
+The device MUST copy the result of cryptographic operation to the guest memory recorded by \filed{dst_data}.\field{addr} filed in struct virtio_crypto_aead_input.
+The device MUST copy the digest result to the guest memory recorded by \filed{digest_result_addr} filed in struct virtio_crypto_aead_input.
+The device MUST set the \filed{status} field in strut virtio_crypto_aead_input: VIRTIO_CRYPTO_OP_OK: success; VIRTIO_CRYPTO_OP_ERR: creation failed or device error; VIRTIO_CRYPTO_OP_NOTSUPP: not supported.
+When the \field{op_code} is VIRTIO_CRYPTO_AEAD_DECRYPT, the device MUST verify and return the verification result to the driver, and if the verification result is incorrect, VIRTIO_CRYPTO_OP_BADMSG (bad message) MUST be returned to the driver.
\ No newline at end of file
--
1.7.12.4
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