qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Qemu-devel] [PATCH v6 2/2] crypto: add virtio-crypto driver


From: Gonglei (Arei)
Subject: Re: [Qemu-devel] [PATCH v6 2/2] crypto: add virtio-crypto driver
Date: Mon, 12 Dec 2016 06:25:12 +0000

Hi, Michael & Herbert

Because the virtio-crypto device emulation had been in QEMU 2.8,
would you please merge the virtio-crypto driver for 4.10 if no other
comments? If so, Miachel pls ack and/or review the patch, then
Herbert will take it (I asked him last week). Thank you!

Ps: Note on 4.10 merge window timing from Linus
 https://lkml.org/lkml/2016/12/7/506

Dec 23rd is the deadline for 4.10 merge window.

Regards,
-Gonglei


> -----Original Message-----
> From: Gonglei (Arei)
> Sent: Thursday, December 08, 2016 12:37 PM
> Subject: [PATCH v6 2/2] crypto: add virtio-crypto driver
> 
> This patch introduces virtio-crypto driver for Linux Kernel.
> 
> The virtio crypto device is a virtual cryptography device
> as well as a kind of virtual hardware accelerator for
> virtual machines. The encryption anddecryption requests
> are placed in the data queue and are ultimately handled by
> thebackend 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 the following
> cryptoservices: CIPHER, MAC, HASH, and AEAD.
> 
> For more information about virtio-crypto device, please see:
>   http://qemu-project.org/Features/VirtioCrypto
> 
> CC: Michael S. Tsirkin <address@hidden>
> CC: Cornelia Huck <address@hidden>
> CC: Stefan Hajnoczi <address@hidden>
> CC: Herbert Xu <address@hidden>
> CC: Halil Pasic <address@hidden>
> CC: David S. Miller <address@hidden>
> CC: Zeng Xin <address@hidden>
> Signed-off-by: Gonglei <address@hidden>
> ---
>  MAINTAINERS                                  |   9 +
>  drivers/crypto/Kconfig                       |   2 +
>  drivers/crypto/Makefile                      |   1 +
>  drivers/crypto/virtio/Kconfig                |  10 +
>  drivers/crypto/virtio/Makefile               |   5 +
>  drivers/crypto/virtio/virtio_crypto_algs.c   | 541
> +++++++++++++++++++++++++++
>  drivers/crypto/virtio/virtio_crypto_common.h | 122 ++++++
>  drivers/crypto/virtio/virtio_crypto_core.c   | 464
> +++++++++++++++++++++++
>  drivers/crypto/virtio/virtio_crypto_mgr.c    | 264 +++++++++++++
>  include/uapi/linux/Kbuild                    |   1 +
>  include/uapi/linux/virtio_crypto.h           | 450
> ++++++++++++++++++++++
>  include/uapi/linux/virtio_ids.h              |   1 +
>  12 files changed, 1870 insertions(+)
>  create mode 100644 drivers/crypto/virtio/Kconfig
>  create mode 100644 drivers/crypto/virtio/Makefile
>  create mode 100644 drivers/crypto/virtio/virtio_crypto_algs.c
>  create mode 100644 drivers/crypto/virtio/virtio_crypto_common.h
>  create mode 100644 drivers/crypto/virtio/virtio_crypto_core.c
>  create mode 100644 drivers/crypto/virtio/virtio_crypto_mgr.c
>  create mode 100644 include/uapi/linux/virtio_crypto.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index ad9b965..cccaaf0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12810,6 +12810,7 @@ F:    drivers/net/virtio_net.c
>  F:   drivers/block/virtio_blk.c
>  F:   include/linux/virtio_*.h
>  F:   include/uapi/linux/virtio_*.h
> +F:   drivers/crypto/virtio/
> 
>  VIRTIO DRIVERS FOR S390
>  M:   Christian Borntraeger <address@hidden>
> @@ -12846,6 +12847,14 @@ S:   Maintained
>  F:   drivers/virtio/virtio_input.c
>  F:   include/uapi/linux/virtio_input.h
> 
> +VIRTIO CRYPTO DRIVER
> +M:  Gonglei <address@hidden>
> +L:  address@hidden
> +L:  address@hidden
> +S:  Maintained
> +F:  drivers/crypto/virtio/
> +F:  include/uapi/linux/virtio_crypto.h
> +
>  VIA RHINE NETWORK DRIVER
>  S:   Orphan
>  F:   drivers/net/ethernet/via/via-rhine.c
> diff --git a/drivers/crypto/Kconfig b/drivers/crypto/Kconfig
> index 4d2b81f..7956478 100644
> --- a/drivers/crypto/Kconfig
> +++ b/drivers/crypto/Kconfig
> @@ -555,4 +555,6 @@ config CRYPTO_DEV_ROCKCHIP
> 
>  source "drivers/crypto/chelsio/Kconfig"
> 
> +source "drivers/crypto/virtio/Kconfig"
> +
>  endif # CRYPTO_HW
> diff --git a/drivers/crypto/Makefile b/drivers/crypto/Makefile
> index ad7250f..bc53cb8 100644
> --- a/drivers/crypto/Makefile
> +++ b/drivers/crypto/Makefile
> @@ -32,3 +32,4 @@ obj-$(CONFIG_CRYPTO_DEV_VMX) += vmx/
>  obj-$(CONFIG_CRYPTO_DEV_SUN4I_SS) += sunxi-ss/
>  obj-$(CONFIG_CRYPTO_DEV_ROCKCHIP) += rockchip/
>  obj-$(CONFIG_CRYPTO_DEV_CHELSIO) += chelsio/
> +obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio/
> diff --git a/drivers/crypto/virtio/Kconfig b/drivers/crypto/virtio/Kconfig
> new file mode 100644
> index 0000000..d80f733
> --- /dev/null
> +++ b/drivers/crypto/virtio/Kconfig
> @@ -0,0 +1,10 @@
> +config CRYPTO_DEV_VIRTIO
> +     tristate "VirtIO crypto driver"
> +     depends on VIRTIO
> +     select CRYPTO_AEAD
> +     select CRYPTO_AUTHENC
> +     select CRYPTO_BLKCIPHER
> +     default m
> +     help
> +       This driver provides support for virtio crypto device. If you
> +       choose 'M' here, this module will be called virtio_crypto.
> diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile
> new file mode 100644
> index 0000000..dd342c9
> --- /dev/null
> +++ b/drivers/crypto/virtio/Makefile
> @@ -0,0 +1,5 @@
> +obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio_crypto.o
> +virtio_crypto-objs := \
> +     virtio_crypto_algs.o \
> +     virtio_crypto_mgr.o \
> +     virtio_crypto_core.o
> diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c
> b/drivers/crypto/virtio/virtio_crypto_algs.c
> new file mode 100644
> index 0000000..7130dc9
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_algs.c
> @@ -0,0 +1,541 @@
> + /* Algorithms supported by virtio crypto device
> +  *
> +  * Authors: Gonglei <address@hidden>
> +  *
> +  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
> +  *
> +  * This program is free software; you can redistribute it and/or modify
> +  * it under the terms of the GNU General Public License as published by
> +  * the Free Software Foundation; either version 2 of the License, or
> +  * (at your option) any later version.
> +  *
> +  * This program is distributed in the hope that it will be useful,
> +  * but WITHOUT ANY WARRANTY; without even the implied warranty of
> +  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +  * GNU General Public License for more details.
> +  *
> +  * You should have received a copy of the GNU General Public License
> +  * along with this program; if not, see <http://www.gnu.org/licenses/>.
> +  */
> +
> +#include <linux/scatterlist.h>
> +#include <crypto/algapi.h>
> +#include <linux/err.h>
> +#include <crypto/scatterwalk.h>
> +#include <linux/atomic.h>
> +
> +#include <uapi/linux/virtio_crypto.h>
> +#include "virtio_crypto_common.h"
> +
> +/*
> + * The algs_lock protects the below global virtio_crypto_active_devs
> + * and crypto algorithms registion.
> + */
> +static DEFINE_MUTEX(algs_lock);
> +static unsigned int virtio_crypto_active_devs;
> +
> +static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
> +{
> +     u64 total = 0;
> +
> +     for (total = 0; sg; sg = sg_next(sg))
> +             total += sg->length;
> +
> +     return total;
> +}
> +
> +static int
> +virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
> +{
> +     switch (key_len) {
> +     case AES_KEYSIZE_128:
> +     case AES_KEYSIZE_192:
> +     case AES_KEYSIZE_256:
> +             *alg = VIRTIO_CRYPTO_CIPHER_AES_CBC;
> +             break;
> +     default:
> +             pr_err("virtio_crypto: Unsupported key length: %d\n",
> +                     key_len);
> +             return -EINVAL;
> +     }
> +     return 0;
> +}
> +
> +static int virtio_crypto_alg_ablkcipher_init_session(
> +             struct virtio_crypto_ablkcipher_ctx *ctx,
> +             uint32_t alg, const uint8_t *key,
> +             unsigned int keylen,
> +             int encrypt)
> +{
> +     struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
> +     unsigned int tmp;
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +     int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT :
> VIRTIO_CRYPTO_OP_DECRYPT;
> +     int err;
> +     unsigned int num_out = 0, num_in = 0;
> +
> +     /*
> +      * Avoid to do DMA from the stack, switch to using
> +      * dynamically-allocated for the key
> +      */
> +     uint8_t *cipher_key = kmalloc(keylen, GFP_ATOMIC);
> +
> +     if (!cipher_key)
> +             return -ENOMEM;
> +
> +     memcpy(cipher_key, key, keylen);
> +
> +     spin_lock(&vcrypto->ctrl_lock);
> +     /* Pad ctrl header */
> +     vcrypto->ctrl.header.opcode =
> +             cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
> +     vcrypto->ctrl.header.algo = cpu_to_le32(alg);
> +     /* Set the default dataqueue id to 0 */
> +     vcrypto->ctrl.header.queue_id = 0;
> +
> +     vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
> +     /* Pad cipher's parameters */
> +     vcrypto->ctrl.u.sym_create_session.op_type =
> +             cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> +     vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo =
> +             vcrypto->ctrl.header.algo;
> +     vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen =
> +             cpu_to_le32(keylen);
> +     vcrypto->ctrl.u.sym_create_session.u.cipher.para.op =
> +             cpu_to_le32(op);
> +
> +     sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> +     sgs[num_out++] = &outhdr;
> +
> +     /* Set key */
> +     sg_init_one(&key_sg, cipher_key, keylen);
> +     sgs[num_out++] = &key_sg;
> +
> +     /* Return status and session id back */
> +     sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
> +     sgs[num_out + num_in++] = &inhdr;
> +
> +     err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
> +                             num_in, vcrypto, GFP_ATOMIC);
> +     if (err < 0) {
> +             spin_unlock(&vcrypto->ctrl_lock);
> +             kzfree(cipher_key);
> +             return err;
> +     }
> +     virtqueue_kick(vcrypto->ctrl_vq);
> +
> +     /*
> +      * Trapping into the hypervisor, so the request should be
> +      * handled immediately.
> +      */
> +     while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
> +            !virtqueue_is_broken(vcrypto->ctrl_vq))
> +             cpu_relax();
> +
> +     if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
> +             spin_unlock(&vcrypto->ctrl_lock);
> +             pr_err("virtio_crypto: Create session failed status: %u\n",
> +                     le32_to_cpu(vcrypto->input.status));
> +             kzfree(cipher_key);
> +             return -EINVAL;
> +     }
> +
> +     if (encrypt)
> +             ctx->enc_sess_info.session_id =
> +                     le64_to_cpu(vcrypto->input.session_id);
> +     else
> +             ctx->dec_sess_info.session_id =
> +                     le64_to_cpu(vcrypto->input.session_id);
> +
> +     spin_unlock(&vcrypto->ctrl_lock);
> +
> +     kzfree(cipher_key);
> +     return 0;
> +}
> +
> +static int virtio_crypto_alg_ablkcipher_close_session(
> +             struct virtio_crypto_ablkcipher_ctx *ctx,
> +             int encrypt)
> +{
> +     struct scatterlist outhdr, status_sg, *sgs[2];
> +     unsigned int tmp;
> +     struct virtio_crypto_destroy_session_req *destroy_session;
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +     int err;
> +     unsigned int num_out = 0, num_in = 0;
> +
> +     spin_lock(&vcrypto->ctrl_lock);
> +     vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
> +     /* Pad ctrl header */
> +     vcrypto->ctrl.header.opcode =
> +             cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
> +     /* Set the default virtqueue id to 0 */
> +     vcrypto->ctrl.header.queue_id = 0;
> +
> +     destroy_session = &vcrypto->ctrl.u.destroy_session;
> +
> +     if (encrypt)
> +             destroy_session->session_id =
> +                     cpu_to_le64(ctx->enc_sess_info.session_id);
> +     else
> +             destroy_session->session_id =
> +                     cpu_to_le64(ctx->dec_sess_info.session_id);
> +
> +     sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> +     sgs[num_out++] = &outhdr;
> +
> +     /* Return status and session id back */
> +     sg_init_one(&status_sg, &vcrypto->ctrl_status.status,
> +             sizeof(vcrypto->ctrl_status.status));
> +     sgs[num_out + num_in++] = &status_sg;
> +
> +     err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
> +                     num_in, vcrypto, GFP_ATOMIC);
> +     if (err < 0) {
> +             spin_unlock(&vcrypto->ctrl_lock);
> +             return err;
> +     }
> +     virtqueue_kick(vcrypto->ctrl_vq);
> +
> +     while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
> +            !virtqueue_is_broken(vcrypto->ctrl_vq))
> +             cpu_relax();
> +
> +     if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
> +             spin_unlock(&vcrypto->ctrl_lock);
> +             pr_err("virtio_crypto: Close session failed status: %u, 
> session_id:
> 0x%llx\n",
> +                     vcrypto->ctrl_status.status,
> +                     destroy_session->session_id);
> +
> +             return -EINVAL;
> +     }
> +     spin_unlock(&vcrypto->ctrl_lock);
> +
> +     return 0;
> +}
> +
> +static int virtio_crypto_alg_ablkcipher_init_sessions(
> +             struct virtio_crypto_ablkcipher_ctx *ctx,
> +             const uint8_t *key, unsigned int keylen)
> +{
> +     uint32_t alg;
> +     int ret;
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +
> +     if (keylen > vcrypto->max_cipher_key_len) {
> +             pr_err("virtio_crypto: the key is too long\n");
> +             goto bad_key;
> +     }
> +
> +     if (virtio_crypto_alg_validate_key(keylen, &alg))
> +             goto bad_key;
> +
> +     /* Create encryption session */
> +     ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
> +                     alg, key, keylen, 1);
> +     if (ret)
> +             return ret;
> +     /* Create decryption session */
> +     ret = virtio_crypto_alg_ablkcipher_init_session(ctx,
> +                     alg, key, keylen, 0);
> +     if (ret) {
> +             virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
> +             return ret;
> +     }
> +     return 0;
> +
> +bad_key:
> +     crypto_tfm_set_flags(ctx->tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
> +     return -EINVAL;
> +}
> +
> +/* Note: kernel crypto API realization */
> +static int virtio_crypto_ablkcipher_setkey(struct crypto_ablkcipher *tfm,
> +                                      const uint8_t *key,
> +                                      unsigned int keylen)
> +{
> +     struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(tfm);
> +     int ret;
> +
> +     if (!ctx->vcrypto) {
> +             /* New key */
> +             int node = virtio_crypto_get_current_node();
> +             struct virtio_crypto *vcrypto =
> +                                   virtcrypto_get_dev_node(node);
> +             if (!vcrypto) {
> +                     pr_err("virtio_crypto: Could not find a virtio device 
> in the
> system");
> +                     return -ENODEV;
> +             }
> +
> +             ctx->vcrypto = vcrypto;
> +     } else {
> +             /* Rekeying, we should close the created sessions previously */
> +             virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
> +             virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
> +     }
> +
> +     ret = virtio_crypto_alg_ablkcipher_init_sessions(ctx, key, keylen);
> +     if (ret) {
> +             virtcrypto_dev_put(ctx->vcrypto);
> +             ctx->vcrypto = NULL;
> +
> +             return ret;
> +     }
> +
> +     return 0;
> +}
> +
> +static int
> +__virtio_crypto_ablkcipher_do_req(struct virtio_crypto_request *vc_req,
> +             struct ablkcipher_request *req,
> +             struct data_queue *data_vq,
> +             __u8 op)
> +{
> +     struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req);
> +     unsigned int ivsize = crypto_ablkcipher_ivsize(tfm);
> +     struct virtio_crypto_ablkcipher_ctx *ctx = vc_req->ablkcipher_ctx;
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +     struct virtio_crypto_op_data_req *req_data;
> +     int src_nents, dst_nents;
> +     int err;
> +     unsigned long flags;
> +     struct scatterlist outhdr, iv_sg, status_sg, **sgs;
> +     int i;
> +     u64 dst_len;
> +     unsigned int num_out = 0, num_in = 0;
> +     int sg_total;
> +     uint8_t *iv;
> +
> +     src_nents = sg_nents_for_len(req->src, req->nbytes);
> +     dst_nents = sg_nents(req->dst);
> +
> +     pr_debug("virtio_crypto: Number of sgs (src_nents: %d,
> dst_nents: %d)\n",
> +                     src_nents, dst_nents);
> +
> +     /* Why 3?  outhdr + iv + inhdr */
> +     sg_total = src_nents + dst_nents + 3;
> +     sgs = kzalloc_node(sg_total * sizeof(*sgs), GFP_ATOMIC,
> +                             dev_to_node(&vcrypto->vdev->dev));
> +     if (!sgs)
> +             return -ENOMEM;
> +
> +     req_data = kzalloc_node(sizeof(*req_data), GFP_ATOMIC,
> +                             dev_to_node(&vcrypto->vdev->dev));
> +     if (!req_data) {
> +             kfree(sgs);
> +             return -ENOMEM;
> +     }
> +
> +     vc_req->req_data = req_data;
> +     vc_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
> +     /* Head of operation */
> +     if (op) {
> +             req_data->header.session_id =
> +                     cpu_to_le64(ctx->enc_sess_info.session_id);
> +             req_data->header.opcode =
> +                     cpu_to_le32(VIRTIO_CRYPTO_CIPHER_ENCRYPT);
> +     } else {
> +             req_data->header.session_id =
> +                     cpu_to_le64(ctx->dec_sess_info.session_id);
> +         req_data->header.opcode =
> +                     cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DECRYPT);
> +     }
> +     req_data->u.sym_req.op_type =
> cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
> +     req_data->u.sym_req.u.cipher.para.iv_len = cpu_to_le32(ivsize);
> +     req_data->u.sym_req.u.cipher.para.src_data_len =
> +                     cpu_to_le32(req->nbytes);
> +
> +     dst_len = virtio_crypto_alg_sg_nents_length(req->dst);
> +     if (unlikely(dst_len > U32_MAX)) {
> +             pr_err("virtio_crypto: The dst_len is beyond U32_MAX\n");
> +             err = -EINVAL;
> +             goto free;
> +     }
> +
> +     pr_debug("virtio_crypto: src_len: %u, dst_len: %llu\n",
> +                     req->nbytes, dst_len);
> +
> +     if (unlikely(req->nbytes + dst_len + ivsize +
> +             sizeof(vc_req->status) > vcrypto->max_size)) {
> +             pr_err("virtio_crypto: The length is too big\n");
> +             err = -EINVAL;
> +             goto free;
> +     }
> +
> +     req_data->u.sym_req.u.cipher.para.dst_data_len =
> +                     cpu_to_le32((uint32_t)dst_len);
> +
> +     /* Outhdr */
> +     sg_init_one(&outhdr, req_data, sizeof(*req_data));
> +     sgs[num_out++] = &outhdr;
> +
> +     /* IV */
> +
> +     /*
> +      * Avoid to do DMA from the stack, switch to using
> +      * dynamically-allocated for the IV
> +      */
> +     iv = kzalloc_node(ivsize, GFP_ATOMIC,
> +                             dev_to_node(&vcrypto->vdev->dev));
> +     if (!iv) {
> +             err = -ENOMEM;
> +             goto free;
> +     }
> +     memcpy(iv, req->info, ivsize);
> +     sg_init_one(&iv_sg, iv, ivsize);
> +     sgs[num_out++] = &iv_sg;
> +     vc_req->iv = iv;
> +
> +     /* Source data */
> +     for (i = 0; i < src_nents; i++)
> +             sgs[num_out++] = &req->src[i];
> +
> +     /* Destination data */
> +     for (i = 0; i < dst_nents; i++)
> +             sgs[num_out + num_in++] = &req->dst[i];
> +
> +     /* Status */
> +     sg_init_one(&status_sg, &vc_req->status, sizeof(vc_req->status));
> +     sgs[num_out + num_in++] = &status_sg;
> +
> +     vc_req->sgs = sgs;
> +
> +     spin_lock_irqsave(&vcrypto->lock, flags);
> +     err = virtqueue_add_sgs(data_vq->vq, sgs, num_out,
> +                             num_in, vc_req, GFP_ATOMIC);
> +     spin_unlock_irqrestore(&vcrypto->lock, flags);
> +     if (unlikely(err < 0))
> +             goto free_iv;
> +
> +     return 0;
> +
> +free_iv:
> +     kzfree(iv);
> +free:
> +     kzfree(req_data);
> +     kfree(sgs);
> +     return err;
> +}
> +
> +static int virtio_crypto_ablkcipher_encrypt(struct ablkcipher_request *req)
> +{
> +     struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
> +     struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
> +     struct virtio_crypto_request *vc_req = ablkcipher_request_ctx(req);
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +     int ret;
> +     /* Use the first data virtqueue as default */
> +     struct data_queue *data_vq = &vcrypto->data_vq[0];
> +
> +     vc_req->ablkcipher_ctx = ctx;
> +     vc_req->ablkcipher_req = req;
> +     ret = __virtio_crypto_ablkcipher_do_req(vc_req, req, data_vq, 1);
> +     if (ret < 0) {
> +             pr_err("virtio_crypto: Encryption failed!\n");
> +             return ret;
> +     }
> +     virtqueue_kick(data_vq->vq);
> +
> +     return -EINPROGRESS;
> +}
> +
> +static int virtio_crypto_ablkcipher_decrypt(struct ablkcipher_request *req)
> +{
> +     struct crypto_ablkcipher *atfm = crypto_ablkcipher_reqtfm(req);
> +     struct virtio_crypto_ablkcipher_ctx *ctx = crypto_ablkcipher_ctx(atfm);
> +     struct virtio_crypto_request *vc_req = ablkcipher_request_ctx(req);
> +     struct virtio_crypto *vcrypto = ctx->vcrypto;
> +     int ret;
> +     /* Use the first data virtqueue as default */
> +     struct data_queue *data_vq = &vcrypto->data_vq[0];
> +
> +     vc_req->ablkcipher_ctx = ctx;
> +     vc_req->ablkcipher_req = req;
> +
> +     ret = __virtio_crypto_ablkcipher_do_req(vc_req, req, data_vq, 0);
> +     if (ret < 0) {
> +             pr_err("virtio_crypto: Decryption failed!\n");
> +             return ret;
> +     }
> +     virtqueue_kick(data_vq->vq);
> +
> +     return -EINPROGRESS;
> +}
> +
> +static int virtio_crypto_ablkcipher_init(struct crypto_tfm *tfm)
> +{
> +     struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
> +
> +     tfm->crt_ablkcipher.reqsize = sizeof(struct virtio_crypto_request);
> +     ctx->tfm = tfm;
> +
> +     return 0;
> +}
> +
> +static void virtio_crypto_ablkcipher_exit(struct crypto_tfm *tfm)
> +{
> +     struct virtio_crypto_ablkcipher_ctx *ctx = crypto_tfm_ctx(tfm);
> +
> +     if (!ctx->vcrypto)
> +             return;
> +
> +     virtio_crypto_alg_ablkcipher_close_session(ctx, 1);
> +     virtio_crypto_alg_ablkcipher_close_session(ctx, 0);
> +     virtcrypto_dev_put(ctx->vcrypto);
> +     ctx->vcrypto = NULL;
> +}
> +
> +static struct crypto_alg virtio_crypto_algs[] = { {
> +     .cra_name = "cbc(aes)",
> +     .cra_driver_name = "virtio_crypto_aes_cbc",
> +     .cra_priority = 501,
> +     .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
> +     .cra_blocksize = AES_BLOCK_SIZE,
> +     .cra_ctxsize  = sizeof(struct virtio_crypto_ablkcipher_ctx),
> +     .cra_alignmask = 0,
> +     .cra_module = THIS_MODULE,
> +     .cra_type = &crypto_ablkcipher_type,
> +     .cra_init = virtio_crypto_ablkcipher_init,
> +     .cra_exit = virtio_crypto_ablkcipher_exit,
> +     .cra_u = {
> +        .ablkcipher = {
> +                     .setkey = virtio_crypto_ablkcipher_setkey,
> +                     .decrypt = virtio_crypto_ablkcipher_decrypt,
> +                     .encrypt = virtio_crypto_ablkcipher_encrypt,
> +                     .min_keysize = AES_MIN_KEY_SIZE,
> +                     .max_keysize = AES_MAX_KEY_SIZE,
> +                     .ivsize = AES_BLOCK_SIZE,
> +             },
> +     },
> +} };
> +
> +int virtio_crypto_algs_register(void)
> +{
> +     int ret = 0;
> +
> +     mutex_lock(&algs_lock);
> +     if (++virtio_crypto_active_devs != 1)
> +             goto unlock;
> +
> +     ret = crypto_register_algs(virtio_crypto_algs,
> +                     ARRAY_SIZE(virtio_crypto_algs));
> +     if (ret)
> +             virtio_crypto_active_devs--;
> +
> +unlock:
> +     mutex_unlock(&algs_lock);
> +     return ret;
> +}
> +
> +void virtio_crypto_algs_unregister(void)
> +{
> +     mutex_lock(&algs_lock);
> +     if (--virtio_crypto_active_devs != 0)
> +             goto unlock;
> +
> +     crypto_unregister_algs(virtio_crypto_algs,
> +                     ARRAY_SIZE(virtio_crypto_algs));
> +
> +unlock:
> +     mutex_unlock(&algs_lock);
> +}
> diff --git a/drivers/crypto/virtio/virtio_crypto_common.h
> b/drivers/crypto/virtio/virtio_crypto_common.h
> new file mode 100644
> index 0000000..975404b
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_common.h
> @@ -0,0 +1,122 @@
> +/* Common header for Virtio crypto device.
> + *
> + * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _VIRTIO_CRYPTO_COMMON_H
> +#define _VIRTIO_CRYPTO_COMMON_H
> +
> +#include <linux/virtio.h>
> +#include <linux/crypto.h>
> +#include <linux/spinlock.h>
> +#include <crypto/aead.h>
> +#include <crypto/aes.h>
> +#include <crypto/authenc.h>
> +
> +
> +/* Internal representation of a data virtqueue */
> +struct data_queue {
> +     /* Virtqueue associated with this send _queue */
> +     struct virtqueue *vq;
> +
> +     /* Name of the tx queue: dataq.$index */
> +     char name[32];
> +};
> +
> +struct virtio_crypto {
> +     struct virtio_device *vdev;
> +     struct virtqueue *ctrl_vq;
> +     struct data_queue *data_vq;
> +
> +     /* To protect the vq operations for the dataq */
> +     spinlock_t lock;
> +
> +     /* To protect the vq operations for the controlq */
> +     spinlock_t ctrl_lock;
> +
> +     /* Maximum of data queues supported by the device */
> +     u32 max_data_queues;
> +
> +     /* Number of queue currently used by the driver */
> +     u32 curr_queue;
> +
> +     /* Maximum length of cipher key */
> +     u32 max_cipher_key_len;
> +     /* Maximum length of authenticated key */
> +     u32 max_auth_key_len;
> +     /* Maximum size of per request */
> +     u64 max_size;
> +
> +     /* Control VQ buffers: protected by the ctrl_lock */
> +     struct virtio_crypto_op_ctrl_req ctrl;
> +     struct virtio_crypto_session_input input;
> +     struct virtio_crypto_inhdr ctrl_status;
> +
> +     unsigned long status;
> +     atomic_t ref_count;
> +     struct list_head list;
> +     struct module *owner;
> +     uint8_t dev_id;
> +
> +     /* Does the affinity hint is set for virtqueues? */
> +     bool affinity_hint_set;
> +};
> +
> +struct virtio_crypto_sym_session_info {
> +     /* Backend session id, which come from the host side */
> +     __u64 session_id;
> +};
> +
> +struct virtio_crypto_ablkcipher_ctx {
> +     struct virtio_crypto *vcrypto;
> +     struct crypto_tfm *tfm;
> +
> +     struct virtio_crypto_sym_session_info enc_sess_info;
> +     struct virtio_crypto_sym_session_info dec_sess_info;
> +};
> +
> +struct virtio_crypto_request {
> +     /* Cipher or aead */
> +     uint32_t type;
> +     uint8_t status;
> +     struct virtio_crypto_ablkcipher_ctx *ablkcipher_ctx;
> +     struct ablkcipher_request *ablkcipher_req;
> +     struct virtio_crypto_op_data_req *req_data;
> +     struct scatterlist **sgs;
> +     uint8_t *iv;
> +};
> +
> +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev);
> +struct list_head *virtcrypto_devmgr_get_head(void);
> +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev);
> +struct virtio_crypto *virtcrypto_devmgr_get_first(void);
> +int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev);
> +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev);
> +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev);
> +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev);
> +struct virtio_crypto *virtcrypto_get_dev_node(int node);
> +int virtcrypto_dev_start(struct virtio_crypto *vcrypto);
> +void virtcrypto_dev_stop(struct virtio_crypto *vcrypto);
> +
> +static inline int virtio_crypto_get_current_node(void)
> +{
> +     return topology_physical_package_id(smp_processor_id());
> +}
> +
> +int virtio_crypto_algs_register(void);
> +void virtio_crypto_algs_unregister(void);
> +
> +#endif /* _VIRTIO_CRYPTO_COMMON_H */
> diff --git a/drivers/crypto/virtio/virtio_crypto_core.c
> b/drivers/crypto/virtio/virtio_crypto_core.c
> new file mode 100644
> index 0000000..286d829
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_core.c
> @@ -0,0 +1,464 @@
> + /* Driver for Virtio crypto device.
> +  *
> +  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
> +  *
> +  * This program is free software; you can redistribute it and/or modify
> +  * it under the terms of the GNU General Public License as published by
> +  * the Free Software Foundation; either version 2 of the License, or
> +  * (at your option) any later version.
> +  *
> +  * This program is distributed in the hope that it will be useful,
> +  * but WITHOUT ANY WARRANTY; without even the implied warranty of
> +  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +  * GNU General Public License for more details.
> +  *
> +  * You should have received a copy of the GNU General Public License
> +  * along with this program; if not, see <http://www.gnu.org/licenses/>.
> +  */
> +
> +#include <linux/err.h>
> +#include <linux/module.h>
> +#include <linux/virtio_config.h>
> +#include <linux/cpu.h>
> +
> +#include <uapi/linux/virtio_crypto.h>
> +#include "virtio_crypto_common.h"
> +
> +
> +static void virtcrypto_dataq_callback(struct virtqueue *vq)
> +{
> +     struct virtio_crypto *vcrypto = vq->vdev->priv;
> +     struct virtio_crypto_request *vc_req;
> +     unsigned long flags;
> +     unsigned int len;
> +     struct ablkcipher_request *ablk_req;
> +     int error;
> +
> +     spin_lock_irqsave(&vcrypto->lock, flags);
> +     do {
> +             virtqueue_disable_cb(vq);
> +             while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
> +                     if (vc_req->type == VIRTIO_CRYPTO_SYM_OP_CIPHER) {
> +                             switch (vc_req->status) {
> +                             case VIRTIO_CRYPTO_OK:
> +                                     error = 0;
> +                                     break;
> +                             case VIRTIO_CRYPTO_INVSESS:
> +                             case VIRTIO_CRYPTO_ERR:
> +                                     error = -EINVAL;
> +                                     break;
> +                             case VIRTIO_CRYPTO_BADMSG:
> +                                     error = -EBADMSG;
> +                                     break;
> +                             default:
> +                                     error = -EIO;
> +                                     break;
> +                             }
> +                             ablk_req = vc_req->ablkcipher_req;
> +                             /* Finish the encrypt or decrypt process */
> +                             ablk_req->base.complete(&ablk_req->base, error);
> +                     }
> +
> +                     kzfree(vc_req->iv);
> +                     kzfree(vc_req->req_data);
> +                     kfree(vc_req->sgs);
> +             }
> +     } while (!virtqueue_enable_cb(vq));
> +     spin_unlock_irqrestore(&vcrypto->lock, flags);
> +}
> +
> +static int virtcrypto_find_vqs(struct virtio_crypto *vi)
> +{
> +     vq_callback_t **callbacks;
> +     struct virtqueue **vqs;
> +     int ret = -ENOMEM;
> +     int i, total_vqs;
> +     const char **names;
> +
> +     /*
> +      * We expect 1 data virtqueue, followed by
> +      * possible N-1 data queues used in multiqueue mode,
> +      * followed by control vq.
> +      */
> +     total_vqs = vi->max_data_queues + 1;
> +
> +     /* Allocate space for find_vqs parameters */
> +     vqs = kcalloc(total_vqs, sizeof(*vqs), GFP_KERNEL);
> +     if (!vqs)
> +             goto err_vq;
> +     callbacks = kcalloc(total_vqs, sizeof(*callbacks), GFP_KERNEL);
> +     if (!callbacks)
> +             goto err_callback;
> +     names = kcalloc(total_vqs, sizeof(*names), GFP_KERNEL);
> +     if (!names)
> +             goto err_names;
> +
> +     /* Parameters for control virtqueue */
> +     callbacks[total_vqs - 1] = NULL;
> +     names[total_vqs - 1] = "controlq";
> +
> +     /* Allocate/initialize parameters for data virtqueues */
> +     for (i = 0; i < vi->max_data_queues; i++) {
> +             callbacks[i] = virtcrypto_dataq_callback;
> +             snprintf(vi->data_vq[i].name, sizeof(vi->data_vq[i].name),
> +                             "dataq.%d", i);
> +             names[i] = vi->data_vq[i].name;
> +     }
> +
> +     ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
> +                                      names);
> +     if (ret)
> +             goto err_find;
> +
> +     vi->ctrl_vq = vqs[total_vqs - 1];
> +
> +     for (i = 0; i < vi->max_data_queues; i++)
> +             vi->data_vq[i].vq = vqs[i];
> +
> +     kfree(names);
> +     kfree(callbacks);
> +     kfree(vqs);
> +
> +     return 0;
> +
> +err_find:
> +     kfree(names);
> +err_names:
> +     kfree(callbacks);
> +err_callback:
> +     kfree(vqs);
> +err_vq:
> +     return ret;
> +}
> +
> +static int virtcrypto_alloc_queues(struct virtio_crypto *vi)
> +{
> +     vi->data_vq = kcalloc(vi->max_data_queues, sizeof(*vi->data_vq),
> +                             GFP_KERNEL);
> +     if (!vi->data_vq)
> +             return -ENOMEM;
> +
> +     return 0;
> +}
> +
> +static void virtcrypto_clean_affinity(struct virtio_crypto *vi, long hcpu)
> +{
> +     int i;
> +
> +     if (vi->affinity_hint_set) {
> +             for (i = 0; i < vi->max_data_queues; i++)
> +                     virtqueue_set_affinity(vi->data_vq[i].vq, -1);
> +
> +             vi->affinity_hint_set = false;
> +     }
> +}
> +
> +static void virtcrypto_set_affinity(struct virtio_crypto *vcrypto)
> +{
> +     int i = 0;
> +     int cpu;
> +
> +     /*
> +      * In single queue mode, we don't set the cpu affinity.
> +      */
> +     if (vcrypto->curr_queue == 1 || vcrypto->max_data_queues == 1) {
> +             virtcrypto_clean_affinity(vcrypto, -1);
> +             return;
> +     }
> +
> +     /*
> +      * In multiqueue mode, we let the queue to be private to one cpu
> +      * by setting the affinity hint to eliminate the contention.
> +      *
> +      * TODO: adds cpu hotplug support by register cpu notifier.
> +      *
> +      */
> +     for_each_online_cpu(cpu) {
> +             virtqueue_set_affinity(vcrypto->data_vq[i].vq, cpu);
> +             if (++i >= vcrypto->max_data_queues)
> +                     break;
> +     }
> +
> +     vcrypto->affinity_hint_set = true;
> +}
> +
> +static void virtcrypto_free_queues(struct virtio_crypto *vi)
> +{
> +     kfree(vi->data_vq);
> +}
> +
> +static int virtcrypto_init_vqs(struct virtio_crypto *vi)
> +{
> +     int ret;
> +
> +     /* Allocate send & receive queues */
> +     ret = virtcrypto_alloc_queues(vi);
> +     if (ret)
> +             goto err;
> +
> +     ret = virtcrypto_find_vqs(vi);
> +     if (ret)
> +             goto err_free;
> +
> +     get_online_cpus();
> +     virtcrypto_set_affinity(vi);
> +     put_online_cpus();
> +
> +     return 0;
> +
> +err_free:
> +     virtcrypto_free_queues(vi);
> +err:
> +     return ret;
> +}
> +
> +static int virtcrypto_update_status(struct virtio_crypto *vcrypto)
> +{
> +     u32 status;
> +     int err;
> +     unsigned long flags;
> +
> +     virtio_cread(vcrypto->vdev,
> +         struct virtio_crypto_config, status, &status);
> +
> +     /*
> +      * Unknown status bits would be a host error and the driver
> +      * should consider the device to be broken.
> +      */
> +     if (status & (~VIRTIO_CRYPTO_S_HW_READY)) {
> +             dev_warn(&vcrypto->vdev->dev,
> +                             "Unknown status bits: 0x%x\n", status);
> +
> +             spin_lock_irqsave(&vcrypto->lock, flags);
> +             virtio_break_device(vcrypto->vdev);
> +             spin_unlock_irqrestore(&vcrypto->lock, flags);
> +             return -EPERM;
> +     }
> +
> +     if (vcrypto->status == status)
> +             return 0;
> +
> +     vcrypto->status = status;
> +
> +     if (vcrypto->status & VIRTIO_CRYPTO_S_HW_READY) {
> +             err = virtcrypto_dev_start(vcrypto);
> +             if (err) {
> +                     dev_err(&vcrypto->vdev->dev,
> +                             "Failed to start virtio crypto device.\n");
> +
> +                     return -EPERM;
> +             }
> +             dev_info(&vcrypto->vdev->dev, "Accelerator is ready\n");
> +     } else {
> +             virtcrypto_dev_stop(vcrypto);
> +             dev_info(&vcrypto->vdev->dev, "Accelerator is not ready\n");
> +     }
> +
> +     return 0;
> +}
> +
> +static void virtcrypto_del_vqs(struct virtio_crypto *vcrypto)
> +{
> +     struct virtio_device *vdev = vcrypto->vdev;
> +
> +     virtcrypto_clean_affinity(vcrypto, -1);
> +
> +     vdev->config->del_vqs(vdev);
> +
> +     virtcrypto_free_queues(vcrypto);
> +}
> +
> +static int virtcrypto_probe(struct virtio_device *vdev)
> +{
> +     int err = -EFAULT;
> +     struct virtio_crypto *vcrypto;
> +     u32 max_data_queues = 0, max_cipher_key_len = 0;
> +     u32 max_auth_key_len = 0;
> +     u64 max_size = 0;
> +
> +     if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
> +             return -ENODEV;
> +
> +     if (!vdev->config->get) {
> +             dev_err(&vdev->dev, "%s failure: config access disabled\n",
> +                     __func__);
> +             return -EINVAL;
> +     }
> +
> +     if (num_possible_nodes() > 1 && dev_to_node(&vdev->dev) < 0) {
> +             /*
> +              * If the accelerator is connected to a node with no memory
> +              * there is no point in using the accelerator since the remote
> +              * memory transaction will be very slow.
> +              */
> +             dev_err(&vdev->dev, "Invalid NUMA configuration.\n");
> +             return -EINVAL;
> +     }
> +
> +     vcrypto = kzalloc_node(sizeof(*vcrypto), GFP_KERNEL,
> +                                     dev_to_node(&vdev->dev));
> +     if (!vcrypto)
> +             return -ENOMEM;
> +
> +     virtio_cread(vdev, struct virtio_crypto_config,
> +                     max_dataqueues, &max_data_queues);
> +     if (max_data_queues < 1)
> +             max_data_queues = 1;
> +
> +     virtio_cread(vdev, struct virtio_crypto_config,
> +             max_cipher_key_len, &max_cipher_key_len);
> +     virtio_cread(vdev, struct virtio_crypto_config,
> +             max_auth_key_len, &max_auth_key_len);
> +     virtio_cread(vdev, struct virtio_crypto_config,
> +             max_size, &max_size);
> +
> +     /* Add virtio crypto device to global table */
> +     err = virtcrypto_devmgr_add_dev(vcrypto);
> +     if (err) {
> +             dev_err(&vdev->dev, "Failed to add new virtio crypto 
> device.\n");
> +             goto free;
> +     }
> +     vcrypto->owner = THIS_MODULE;
> +     vcrypto = vdev->priv = vcrypto;
> +     vcrypto->vdev = vdev;
> +     spin_lock_init(&vcrypto->lock);
> +     spin_lock_init(&vcrypto->ctrl_lock);
> +
> +     /* Use single data queue as default */
> +     vcrypto->curr_queue = 1;
> +     vcrypto->max_data_queues = max_data_queues;
> +     vcrypto->max_cipher_key_len = max_cipher_key_len;
> +     vcrypto->max_auth_key_len = max_auth_key_len;
> +     vcrypto->max_size = max_size;
> +
> +     dev_info(&vdev->dev,
> +             "max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u,
> max_size 0x%llx\n",
> +             vcrypto->max_data_queues,
> +             vcrypto->max_cipher_key_len,
> +             vcrypto->max_auth_key_len,
> +             vcrypto->max_size);
> +
> +     err = virtcrypto_init_vqs(vcrypto);
> +     if (err) {
> +             dev_err(&vdev->dev, "Failed to initialize vqs.\n");
> +             goto free_dev;
> +     }
> +     virtio_device_ready(vdev);
> +
> +     err = virtcrypto_update_status(vcrypto);
> +     if (err)
> +             goto free_vqs;
> +
> +     return 0;
> +
> +free_vqs:
> +     vcrypto->vdev->config->reset(vdev);
> +     virtcrypto_del_vqs(vcrypto);
> +free_dev:
> +     virtcrypto_devmgr_rm_dev(vcrypto);
> +free:
> +     kfree(vcrypto);
> +     return err;
> +}
> +
> +static void virtcrypto_free_unused_reqs(struct virtio_crypto *vcrypto)
> +{
> +     struct virtio_crypto_request *vc_req;
> +     int i;
> +     struct virtqueue *vq;
> +
> +     for (i = 0; i < vcrypto->max_data_queues; i++) {
> +             vq = vcrypto->data_vq[i].vq;
> +             while ((vc_req = virtqueue_detach_unused_buf(vq)) != NULL) {
> +                     kfree(vc_req->req_data);
> +                     kfree(vc_req->sgs);
> +             }
> +     }
> +}
> +
> +static void virtcrypto_remove(struct virtio_device *vdev)
> +{
> +     struct virtio_crypto *vcrypto = vdev->priv;
> +
> +     dev_info(&vdev->dev, "Start virtcrypto_remove.\n");
> +
> +     if (virtcrypto_dev_started(vcrypto))
> +             virtcrypto_dev_stop(vcrypto);
> +     vdev->config->reset(vdev);
> +     virtcrypto_free_unused_reqs(vcrypto);
> +     virtcrypto_del_vqs(vcrypto);
> +     virtcrypto_devmgr_rm_dev(vcrypto);
> +     kfree(vcrypto);
> +}
> +
> +static void virtcrypto_config_changed(struct virtio_device *vdev)
> +{
> +     struct virtio_crypto *vcrypto = vdev->priv;
> +
> +     virtcrypto_update_status(vcrypto);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int virtcrypto_freeze(struct virtio_device *vdev)
> +{
> +     struct virtio_crypto *vcrypto = vdev->priv;
> +
> +     vdev->config->reset(vdev);
> +     virtcrypto_free_unused_reqs(vcrypto);
> +     if (virtcrypto_dev_started(vcrypto))
> +             virtcrypto_dev_stop(vcrypto);
> +
> +     virtcrypto_del_vqs(vcrypto);
> +     return 0;
> +}
> +
> +static int virtcrypto_restore(struct virtio_device *vdev)
> +{
> +     struct virtio_crypto *vcrypto = vdev->priv;
> +     int err;
> +
> +     err = virtcrypto_init_vqs(vcrypto);
> +     if (err)
> +             return err;
> +
> +     virtio_device_ready(vdev);
> +     err = virtcrypto_dev_start(vcrypto);
> +     if (err) {
> +             dev_err(&vdev->dev, "Failed to start virtio crypto device.\n");
> +             return -EFAULT;
> +     }
> +
> +     return 0;
> +}
> +#endif
> +
> +static unsigned int features[] = {
> +     /* none */
> +};
> +
> +static struct virtio_device_id id_table[] = {
> +     { VIRTIO_ID_CRYPTO, VIRTIO_DEV_ANY_ID },
> +     { 0 },
> +};
> +
> +static struct virtio_driver virtio_crypto_driver = {
> +     .driver.name         = KBUILD_MODNAME,
> +     .driver.owner        = THIS_MODULE,
> +     .feature_table       = features,
> +     .feature_table_size  = ARRAY_SIZE(features),
> +     .id_table            = id_table,
> +     .probe               = virtcrypto_probe,
> +     .remove              = virtcrypto_remove,
> +     .config_changed = virtcrypto_config_changed,
> +#ifdef CONFIG_PM_SLEEP
> +     .freeze = virtcrypto_freeze,
> +     .restore = virtcrypto_restore,
> +#endif
> +};
> +
> +module_virtio_driver(virtio_crypto_driver);
> +
> +MODULE_DEVICE_TABLE(virtio, id_table);
> +MODULE_DESCRIPTION("virtio crypto device driver");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Gonglei <address@hidden>");
> diff --git a/drivers/crypto/virtio/virtio_crypto_mgr.c
> b/drivers/crypto/virtio/virtio_crypto_mgr.c
> new file mode 100644
> index 0000000..a69ff71
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_mgr.c
> @@ -0,0 +1,264 @@
> + /* Management for virtio crypto devices (refer to adf_dev_mgr.c)
> +  *
> +  * Copyright 2016 HUAWEI TECHNOLOGIES CO., LTD.
> +  *
> +  * This program is free software; you can redistribute it and/or modify
> +  * it under the terms of the GNU General Public License as published by
> +  * the Free Software Foundation; either version 2 of the License, or
> +  * (at your option) any later version.
> +  *
> +  * This program is distributed in the hope that it will be useful,
> +  * but WITHOUT ANY WARRANTY; without even the implied warranty of
> +  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> +  * GNU General Public License for more details.
> +  *
> +  * You should have received a copy of the GNU General Public License
> +  * along with this program; if not, see <http://www.gnu.org/licenses/>.
> +  */
> +
> +#include <linux/mutex.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +
> +#include <uapi/linux/virtio_crypto.h>
> +#include "virtio_crypto_common.h"
> +
> +static LIST_HEAD(virtio_crypto_table);
> +static uint32_t num_devices;
> +
> +/* The table_lock protects the above global list and num_devices */
> +static DEFINE_MUTEX(table_lock);
> +
> +#define VIRTIO_CRYPTO_MAX_DEVICES 32
> +
> +
> +/*
> + * virtcrypto_devmgr_add_dev() - Add vcrypto_dev to the acceleration
> + * framework.
> + * @vcrypto_dev:  Pointer to virtio crypto device.
> + *
> + * Function adds virtio crypto device to the global list.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: 0 on success, error code othewise.
> + */
> +int virtcrypto_devmgr_add_dev(struct virtio_crypto *vcrypto_dev)
> +{
> +     struct list_head *itr;
> +
> +     mutex_lock(&table_lock);
> +     if (num_devices == VIRTIO_CRYPTO_MAX_DEVICES) {
> +             pr_info("virtio_crypto: only support up to %d devices\n",
> +                         VIRTIO_CRYPTO_MAX_DEVICES);
> +             mutex_unlock(&table_lock);
> +             return -EFAULT;
> +     }
> +
> +     list_for_each(itr, &virtio_crypto_table) {
> +             struct virtio_crypto *ptr =
> +                             list_entry(itr, struct virtio_crypto, list);
> +
> +             if (ptr == vcrypto_dev) {
> +                     mutex_unlock(&table_lock);
> +                     return -EEXIST;
> +             }
> +     }
> +     atomic_set(&vcrypto_dev->ref_count, 0);
> +     list_add_tail(&vcrypto_dev->list, &virtio_crypto_table);
> +     vcrypto_dev->dev_id = num_devices++;
> +     mutex_unlock(&table_lock);
> +     return 0;
> +}
> +
> +struct list_head *virtcrypto_devmgr_get_head(void)
> +{
> +     return &virtio_crypto_table;
> +}
> +
> +/*
> + * virtcrypto_devmgr_rm_dev() - Remove vcrypto_dev from the acceleration
> + * framework.
> + * @vcrypto_dev:  Pointer to virtio crypto device.
> + *
> + * Function removes virtio crypto device from the acceleration framework.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: void
> + */
> +void virtcrypto_devmgr_rm_dev(struct virtio_crypto *vcrypto_dev)
> +{
> +     mutex_lock(&table_lock);
> +     list_del(&vcrypto_dev->list);
> +     num_devices--;
> +     mutex_unlock(&table_lock);
> +}
> +
> +/*
> + * virtcrypto_devmgr_get_first()
> + *
> + * Function returns the first virtio crypto device from the acceleration
> + * framework.
> + *
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: pointer to vcrypto_dev or NULL if not found.
> + */
> +struct virtio_crypto *virtcrypto_devmgr_get_first(void)
> +{
> +     struct virtio_crypto *dev = NULL;
> +
> +     mutex_lock(&table_lock);
> +     if (!list_empty(&virtio_crypto_table))
> +             dev = list_first_entry(&virtio_crypto_table,
> +                                     struct virtio_crypto,
> +                                 list);
> +     mutex_unlock(&table_lock);
> +     return dev;
> +}
> +
> +/*
> + * virtcrypto_dev_in_use() - Check whether vcrypto_dev is currently in use
> + * @vcrypto_dev: Pointer to virtio crypto device.
> + *
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: 1 when device is in use, 0 otherwise.
> + */
> +int virtcrypto_dev_in_use(struct virtio_crypto *vcrypto_dev)
> +{
> +     return atomic_read(&vcrypto_dev->ref_count) != 0;
> +}
> +
> +/*
> + * virtcrypto_dev_get() - Increment vcrypto_dev reference count
> + * @vcrypto_dev: Pointer to virtio crypto device.
> + *
> + * Increment the vcrypto_dev refcount and if this is the first time
> + * incrementing it during this period the vcrypto_dev is in use,
> + * increment the module refcount too.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: 0 when successful, EFAULT when fail to bump module refcount
> + */
> +int virtcrypto_dev_get(struct virtio_crypto *vcrypto_dev)
> +{
> +     if (atomic_add_return(1, &vcrypto_dev->ref_count) == 1)
> +             if (!try_module_get(vcrypto_dev->owner))
> +                     return -EFAULT;
> +     return 0;
> +}
> +
> +/*
> + * virtcrypto_dev_put() - Decrement vcrypto_dev reference count
> + * @vcrypto_dev: Pointer to virtio crypto device.
> + *
> + * Decrement the vcrypto_dev refcount and if this is the last time
> + * decrementing it during this period the vcrypto_dev is in use,
> + * decrement the module refcount too.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: void
> + */
> +void virtcrypto_dev_put(struct virtio_crypto *vcrypto_dev)
> +{
> +     if (atomic_sub_return(1, &vcrypto_dev->ref_count) == 0)
> +             module_put(vcrypto_dev->owner);
> +}
> +
> +/*
> + * virtcrypto_dev_started() - Check whether device has started
> + * @vcrypto_dev: Pointer to virtio crypto device.
> + *
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: 1 when the device has started, 0 otherwise
> + */
> +int virtcrypto_dev_started(struct virtio_crypto *vcrypto_dev)
> +{
> +     return (vcrypto_dev->status & VIRTIO_CRYPTO_S_HW_READY);
> +}
> +
> +/*
> + * virtcrypto_get_dev_node() - Get vcrypto_dev on the node.
> + * @node:  Node id the driver works.
> + *
> + * Function returns the virtio crypto device used fewest on the node.
> + *
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: pointer to vcrypto_dev or NULL if not found.
> + */
> +struct virtio_crypto *virtcrypto_get_dev_node(int node)
> +{
> +     struct virtio_crypto *vcrypto_dev = NULL, *tmp_dev;
> +     unsigned long best = ~0;
> +     unsigned long ctr;
> +
> +     mutex_lock(&table_lock);
> +     list_for_each_entry(tmp_dev, virtcrypto_devmgr_get_head(), list) {
> +
> +             if ((node == dev_to_node(&tmp_dev->vdev->dev) ||
> +                  dev_to_node(&tmp_dev->vdev->dev) < 0) &&
> +                 virtcrypto_dev_started(tmp_dev)) {
> +                     ctr = atomic_read(&tmp_dev->ref_count);
> +                     if (best > ctr) {
> +                             vcrypto_dev = tmp_dev;
> +                             best = ctr;
> +                     }
> +             }
> +     }
> +
> +     if (!vcrypto_dev) {
> +             pr_info("virtio_crypto: Could not find a device on node %d\n",
> +                             node);
> +             /* Get any started device */
> +             list_for_each_entry(tmp_dev,
> +                             virtcrypto_devmgr_get_head(), list) {
> +                     if (virtcrypto_dev_started(tmp_dev)) {
> +                             vcrypto_dev = tmp_dev;
> +                             break;
> +                     }
> +             }
> +     }
> +     mutex_unlock(&table_lock);
> +     if (!vcrypto_dev)
> +             return NULL;
> +
> +     virtcrypto_dev_get(vcrypto_dev);
> +     return vcrypto_dev;
> +}
> +
> +/*
> + * virtcrypto_dev_start() - Start virtio crypto device
> + * @vcrypto:    Pointer to virtio crypto device.
> + *
> + * Function notifies all the registered services that the virtio crypto 
> device
> + * is ready to be used.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: 0 on success, EFAULT when fail to register algorithms
> + */
> +int virtcrypto_dev_start(struct virtio_crypto *vcrypto)
> +{
> +     if (virtio_crypto_algs_register()) {
> +             pr_err("virtio_crypto: Failed to register crypto algs\n");
> +             return -EFAULT;
> +     }
> +
> +     return 0;
> +}
> +
> +/*
> + * virtcrypto_dev_stop() - Stop virtio crypto device
> + * @vcrypto:    Pointer to virtio crypto device.
> + *
> + * Function notifies all the registered services that the virtio crypto 
> device
> + * is ready to be used.
> + * To be used by virtio crypto device specific drivers.
> + *
> + * Return: void
> + */
> +void virtcrypto_dev_stop(struct virtio_crypto *vcrypto)
> +{
> +     virtio_crypto_algs_unregister();
> +}
> diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
> index cd2be1c..4bdb84c 100644
> --- a/include/uapi/linux/Kbuild
> +++ b/include/uapi/linux/Kbuild
> @@ -460,6 +460,7 @@ header-y += virtio_rng.h
>  header-y += virtio_scsi.h
>  header-y += virtio_types.h
>  header-y += virtio_vsock.h
> +header-y += virtio_crypto.h
>  header-y += vm_sockets.h
>  header-y += vt.h
>  header-y += vtpm_proxy.h
> diff --git a/include/uapi/linux/virtio_crypto.h
> b/include/uapi/linux/virtio_crypto.h
> new file mode 100644
> index 0000000..50cdc8a
> --- /dev/null
> +++ b/include/uapi/linux/virtio_crypto.h
> @@ -0,0 +1,450 @@
> +#ifndef _VIRTIO_CRYPTO_H
> +#define _VIRTIO_CRYPTO_H
> +/* This header is BSD licensed so anyone can use the definitions to implement
> + * compatible drivers/servers.
> + *
> + * Redistribution and use in source and binary forms, with or without
> + * modification, are permitted provided that the following conditions
> + * are met:
> + * 1. Redistributions of source code must retain the above copyright
> + *    notice, this list of conditions and the following disclaimer.
> + * 2. Redistributions in binary form must reproduce the above copyright
> + *    notice, this list of conditions and the following disclaimer in the
> + *    documentation and/or other materials provided with the distribution.
> + * 3. Neither the name of IBM nor the names of its contributors
> + *    may be used to endorse or promote products derived from this
> software
> + *    without specific prior written permission.
> + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
> CONTRIBUTORS
> + * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT
> NOT
> + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
> FITNESS
> + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL IBM
> OR
> + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
> + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
> NOT
> + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
> OF
> + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
> AND
> + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
> + * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
> OUT
> + * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
> + * SUCH DAMAGE.
> + */
> +#include <linux/types.h>
> +#include <linux/virtio_types.h>
> +#include <linux/virtio_ids.h>
> +#include <linux/virtio_config.h>
> +
> +
> +#define VIRTIO_CRYPTO_SERVICE_CIPHER 0
> +#define VIRTIO_CRYPTO_SERVICE_HASH   1
> +#define VIRTIO_CRYPTO_SERVICE_MAC    2
> +#define VIRTIO_CRYPTO_SERVICE_AEAD   3
> +
> +#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;
> +};
> +
> +struct virtio_crypto_cipher_session_para {
> +#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
> +     __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_session_input {
> +     /* Device-writable part */
> +     __le64 session_id;
> +     __le32 status;
> +     __le32 padding;
> +};
> +
> +struct virtio_crypto_cipher_session_req {
> +     struct virtio_crypto_cipher_session_para para;
> +     __u8 padding[32];
> +};
> +
> +struct virtio_crypto_hash_session_para {
> +#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
> +     __le32 algo;
> +     /* hash result length */
> +     __le32 hash_result_len;
> +     __u8 padding[8];
> +};
> +
> +struct virtio_crypto_hash_create_session_req {
> +     struct virtio_crypto_hash_session_para para;
> +     __u8 padding[40];
> +};
> +
> +struct virtio_crypto_mac_session_para {
> +#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
> +     __le32 algo;
> +     /* hash result length */
> +     __le32 hash_result_len;
> +     /* length of authenticated key */
> +     __le32 auth_key_len;
> +     __le32 padding;
> +};
> +
> +struct virtio_crypto_mac_create_session_req {
> +     struct virtio_crypto_mac_session_para para;
> +     __u8 padding[40];
> +};
> +
> +struct virtio_crypto_aead_session_para {
> +#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
> +     __le32 algo;
> +     /* length of key */
> +     __le32 key_len;
> +     /* hash result length */
> +     __le32 hash_result_len;
> +     /* 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_create_session_req {
> +     struct virtio_crypto_aead_session_para para;
> +     __u8 padding[32];
> +};
> +
> +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;
> +             __u8 padding[16];
> +     } u;
> +     /* length of the additional authenticated data (AAD) in bytes */
> +     __le32 aad_len;
> +     __le32 padding;
> +};
> +
> +struct virtio_crypto_alg_chain_session_req {
> +     struct virtio_crypto_alg_chain_session_para para;
> +};
> +
> +struct virtio_crypto_sym_create_session_req {
> +     union {
> +             struct virtio_crypto_cipher_session_req cipher;
> +             struct virtio_crypto_alg_chain_session_req chain;
> +             __u8 padding[48];
> +     } 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;
> +};
> +
> +struct virtio_crypto_destroy_session_req {
> +     /* Device-readable part */
> +     __le64  session_id;
> +     __u8 padding[48];
> +};
> +
> +/* The request of the control virtqueue's packet */
> +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;
> +             __u8 padding[56];
> +     } u;
> +};
> +
> +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;
> +};
> +
> +struct virtio_crypto_cipher_para {
> +     /*
> +      * Byte Length of valid IV/Counter
> +      *
> +      * For block ciphers in CBC or F8 mode, or for Kasumi in F8 mode, or for
> +      *   SNOW3G in UEA2 mode, this is the length of the IV (which
> +      *   must be the same as the block length of the cipher).
> +      * For block ciphers in CTR mode, this is the length of the counter
> +      *   (which must be the same as the block length of the cipher).
> +      * For AES-XTS, this is the 128bit tweak, i, from IEEE Std 1619-2007.
> +      *
> +      * The IV/Counter will be updated after every partial cryptographic
> +      * operation.
> +      */
> +     __le32 iv_len;
> +     /* length of source data */
> +     __le32 src_data_len;
> +     /* length of dst data */
> +     __le32 dst_data_len;
> +     __le32 padding;
> +};
> +
> +struct virtio_crypto_hash_para {
> +     /* length of source data */
> +     __le32 src_data_len;
> +     /* hash result length */
> +     __le32 hash_result_len;
> +};
> +
> +struct virtio_crypto_mac_para {
> +     struct virtio_crypto_hash_para hash;
> +};
> +
> +struct virtio_crypto_aead_para {
> +     /*
> +      * Byte Length of valid IV data pointed to by the below iv_addr
> +      * parameter.
> +      *
> +      * For GCM mode, this is either 12 (for 96-bit IVs) or 16, in which
> +      *   case iv_addr points to J0.
> +      * For CCM mode, this is the length of the nonce, which can be in the
> +      *   range 7 to 13 inclusive.
> +      */
> +     __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_cipher_data_req {
> +     /* Device-readable part */
> +     struct virtio_crypto_cipher_para para;
> +     __u8 padding[24];
> +};
> +
> +struct virtio_crypto_hash_data_req {
> +     /* Device-readable part */
> +     struct virtio_crypto_hash_para para;
> +     __u8 padding[40];
> +};
> +
> +struct virtio_crypto_mac_data_req {
> +     /* Device-readable part */
> +     struct virtio_crypto_mac_para para;
> +     __u8 padding[40];
> +};
> +
> +struct virtio_crypto_alg_chain_data_para {
> +     __le32 iv_len;
> +     /* Length of source data */
> +     __le32 src_data_len;
> +     /* Length of destination data */
> +     __le32 dst_data_len;
> +     /* Starting point for cipher processing in source data */
> +     __le32 cipher_start_src_offset;
> +     /* Length of the source data that the cipher will be computed on */
> +     __le32 len_to_cipher;
> +     /* Starting point for hash processing in source data */
> +     __le32 hash_start_src_offset;
> +     /* Length of the source data that the hash will be computed on */
> +     __le32 len_to_hash;
> +     /* Length of the additional auth data */
> +     __le32 aad_len;
> +     /* Length of the hash result */
> +     __le32 hash_result_len;
> +     __le32 reserved;
> +};
> +
> +struct virtio_crypto_alg_chain_data_req {
> +     /* Device-readable part */
> +     struct virtio_crypto_alg_chain_data_para para;
> +};
> +
> +struct virtio_crypto_sym_data_req {
> +     union {
> +             struct virtio_crypto_cipher_data_req cipher;
> +             struct virtio_crypto_alg_chain_data_req chain;
> +             __u8 padding[40];
> +     } u;
> +
> +     /* See above VIRTIO_CRYPTO_SYM_OP_* */
> +     __le32 op_type;
> +     __le32 padding;
> +};
> +
> +struct virtio_crypto_aead_data_req {
> +     /* Device-readable part */
> +     struct virtio_crypto_aead_para para;
> +     __u8 padding[32];
> +};
> +
> +/* The request of the data virtqueue's packet */
> +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;
> +             __u8 padding[48];
> +     } u;
> +};
> +
> +#define VIRTIO_CRYPTO_OK        0
> +#define VIRTIO_CRYPTO_ERR       1
> +#define VIRTIO_CRYPTO_BADMSG    2
> +#define VIRTIO_CRYPTO_NOTSUPP   3
> +#define VIRTIO_CRYPTO_INVSESS   4 /* Invalid session id */
> +
> +/* The accelerator hardware is ready */
> +#define VIRTIO_CRYPTO_S_HW_READY  (1 << 0)
> +
> +struct virtio_crypto_config {
> +     /* See VIRTIO_CRYPTO_OP_* above */
> +     __u32  status;
> +
> +     /*
> +      * Maximum number of data queue
> +      */
> +     __u32  max_dataqueues;
> +
> +     /*
> +      * Specifies the services mask which the device support,
> +      * see VIRTIO_CRYPTO_SERVICE_* above
> +      */
> +     __u32 crypto_services;
> +
> +     /* Detailed algorithms mask */
> +     __u32 cipher_algo_l;
> +     __u32 cipher_algo_h;
> +     __u32 hash_algo;
> +     __u32 mac_algo_l;
> +     __u32 mac_algo_h;
> +     __u32 aead_algo;
> +     /* Maximum length of cipher key */
> +     __u32 max_cipher_key_len;
> +     /* Maximum length of authenticated key */
> +     __u32 max_auth_key_len;
> +     __u32 reserve;
> +     /* Maximum size of each crypto request's content */
> +     __u64 max_size;
> +};
> +
> +struct virtio_crypto_inhdr {
> +     /* See VIRTIO_CRYPTO_* above */
> +     __u8 status;
> +};
> +#endif
> diff --git a/include/uapi/linux/virtio_ids.h b/include/uapi/linux/virtio_ids.h
> index 3228d58..6d5c3b2 100644
> --- a/include/uapi/linux/virtio_ids.h
> +++ b/include/uapi/linux/virtio_ids.h
> @@ -42,5 +42,6 @@
>  #define VIRTIO_ID_GPU          16 /* virtio GPU */
>  #define VIRTIO_ID_INPUT        18 /* virtio input */
>  #define VIRTIO_ID_VSOCK        19 /* virtio vsock transport */
> +#define VIRTIO_ID_CRYPTO       20 /* virtio crypto */
> 
>  #endif /* _LINUX_VIRTIO_IDS_H */
> --
> 1.8.3.1
> 




reply via email to

[Prev in Thread] Current Thread [Next in Thread]