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From:   "Gonglei (Arei)" <arei.gonglei@huawei.com>
To:     zhenwei pi <pizhenwei@bytedance.com>,
        "mst@redhat.com" <mst@redhat.com>
CC:     "jasowang@redhat.com" <jasowang@redhat.com>,
        "virtualization@lists.linux-foundation.org" 
        <virtualization@lists.linux-foundation.org>,
        "linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "helei.sig11@bytedance.com" <helei.sig11@bytedance.com>,
        "herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
        kernel test robot <lkp@intel.com>
Subject: RE: [PATCH v2 3/3] virtio-crypto: implement RSA algorithm
Thread-Topic: [PATCH v2 3/3] virtio-crypto: implement RSA algorithm
Thread-Index: AQHYHyNdmQ1PUS7bOkm8+NDZ9iI5BayXq8sQ
Date:   Thu, 17 Feb 2022 12:07:22 +0000
Message-ID: <c9144b0d82e34566a960f210ddc32696@huawei.com>
References: <20220211084108.1254218-1-pizhenwei@bytedance.com>
 <20220211084108.1254218-4-pizhenwei@bytedance.com>
In-Reply-To: <20220211084108.1254218-4-pizhenwei@bytedance.com>
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> -----Original Message-----
> From: zhenwei pi [mailto:pizhenwei@bytedance.com]
> Sent: Friday, February 11, 2022 4:41 PM
> To: Gonglei (Arei) <arei.gonglei@huawei.com>; mst@redhat.com
> Cc: jasowang@redhat.com; virtualization@lists.linux-foundation.org;
> linux-crypto@vger.kernel.org; linux-kernel@vger.kernel.org;
> helei.sig11@bytedance.com; herbert@gondor.apana.org.au; zhenwei pi
> <pizhenwei@bytedance.com>; kernel test robot <lkp@intel.com>
> Subject: [PATCH v2 3/3] virtio-crypto: implement RSA algorithm
> 
> Support rsa & pkcs1pad(rsa,sha1) with priority 150.
> 
> Test with QEMU built-in backend, it works fine.
> 1, The self-test framework of crypto layer works fine in guest kernel 2, Test with
> Linux guest(with asym support), the following script test(note that pkey_XXX is
> supported only in a newer version of keyutils):
>   - both public key & private key
>   - create/close session
>   - encrypt/decrypt/sign/verify basic driver operation
>   - also test with kernel crypto layer(pkey add/query)
> 
> All the cases work fine.
> 
> rm -rf *.der *.pem *.pfx
> modprobe pkcs8_key_parser # if CONFIG_PKCS8_PRIVATE_KEY_PARSER=m rm
> -rf /tmp/data dd if=/dev/random of=/tmp/data count=1 bs=226
> 
> openssl req -nodes -x509 -newkey rsa:2048 -keyout key.pem -out cert.pem -subj
> "/C=CN/ST=BJ/L=HD/O=qemu/OU=dev/CN=qemu/emailAddress=qemu@qemu
> .org"
> openssl pkcs8 -in key.pem -topk8 -nocrypt -outform DER -out key.der openssl
> x509 -in cert.pem -inform PEM -outform DER -out cert.der
> 
> PRIV_KEY_ID=`cat key.der | keyctl padd asymmetric test_priv_key @s` echo "priv
> key id = "$PRIV_KEY_ID PUB_KEY_ID=`cat cert.der | keyctl padd asymmetric
> test_pub_key @s` echo "pub key id = "$PUB_KEY_ID
> 
> keyctl pkey_query $PRIV_KEY_ID 0
> keyctl pkey_query $PUB_KEY_ID 0
> 
> echo "Enc with priv key..."
> keyctl pkey_encrypt $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.priv echo
> "Dec with pub key..."
> keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.priv enc=pkcs1 >/tmp/dec cmp
> /tmp/data /tmp/dec
> 
> echo "Sign with priv key..."
> keyctl pkey_sign $PRIV_KEY_ID 0 /tmp/data enc=pkcs1 hash=sha1 > /tmp/sig
> echo "Verify with pub key..."
> keyctl pkey_verify $PRIV_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1
> 
> echo "Enc with pub key..."
> keyctl pkey_encrypt $PUB_KEY_ID 0 /tmp/data enc=pkcs1 >/tmp/enc.pub echo
> "Dec with priv key..."
> keyctl pkey_decrypt $PRIV_KEY_ID 0 /tmp/enc.pub enc=pkcs1 >/tmp/dec cmp
> /tmp/data /tmp/dec
> 
> echo "Verify with pub key..."
> keyctl pkey_verify $PUB_KEY_ID 0 /tmp/data /tmp/sig enc=pkcs1 hash=sha1
> 
> [1 compiling warning during development]
> Reported-by: kernel test robot <lkp@intel.com>
> 
> Co-developed-by: lei he <helei.sig11@bytedance.com>
> Signed-off-by: lei he <helei.sig11@bytedance.com>
> Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
> ---
>  drivers/crypto/virtio/Makefile                |   1 +
>  .../virtio/virtio_crypto_akcipher_algo.c      | 584 ++++++++++++++++++
>  drivers/crypto/virtio/virtio_crypto_common.h  |   3 +
>  drivers/crypto/virtio/virtio_crypto_core.c    |   6 +-
>  drivers/crypto/virtio/virtio_crypto_mgr.c     |  11 +
>  5 files changed, 604 insertions(+), 1 deletion(-)  create mode 100644
> drivers/crypto/virtio/virtio_crypto_akcipher_algo.c
> 
> diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile index
> cbfccccfa135..06b23c5e784e 100644
> --- a/drivers/crypto/virtio/Makefile
> +++ b/drivers/crypto/virtio/Makefile
> @@ -2,5 +2,6 @@
>  obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio_crypto.o  virtio_crypto-objs :=
> \
>  	virtio_crypto_algs.o \
> +	virtio_crypto_akcipher_algo.o \
>  	virtio_crypto_mgr.o \
>  	virtio_crypto_core.o
> diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algo.c
> b/drivers/crypto/virtio/virtio_crypto_akcipher_algo.c
> new file mode 100644
> index 000000000000..2b3f8780b755
> --- /dev/null
> +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algo.c
> @@ -0,0 +1,584 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> + /* Asymmetric algorithms supported by virtio crypto device
> +  *
> +  * Authors: zhenwei pi <pizhenwei@bytedance.com>
> +  *          lei he <helei.sig11@bytedance.com>
> +  *
> +  * Copyright 2022 Bytedance CO., LTD.
> +  */
> +
> +#include <linux/mpi.h>
> +#include <linux/scatterlist.h>
> +#include <crypto/algapi.h>
> +#include <crypto/internal/akcipher.h>
> +#include <crypto/internal/rsa.h>
> +#include <linux/err.h>
> +#include <crypto/scatterwalk.h>
> +#include <linux/atomic.h>
> +
> +#include <uapi/linux/virtio_crypto.h>
> +#include "virtio_crypto_common.h"
> +
> +struct virtio_crypto_rsa_ctx {
> +	MPI n;
> +};
> +
> +struct virtio_crypto_akcipher_ctx {
> +	struct crypto_engine_ctx enginectx;
> +	struct virtio_crypto *vcrypto;
> +	struct crypto_akcipher *tfm;
> +	bool session_valid;
> +	__u64 session_id;
> +	union {
> +		struct virtio_crypto_rsa_ctx rsa_ctx;
> +	};
> +};
> +
> +struct virtio_crypto_akcipher_request {
> +	struct virtio_crypto_request base;
> +	struct virtio_crypto_akcipher_ctx *akcipher_ctx;
> +	struct akcipher_request *akcipher_req;
> +	void *src_buf;
> +	void *dst_buf;
> +	uint32_t opcode;
> +};
> +
> +struct virtio_crypto_akcipher_algo {
> +	uint32_t algonum;
> +	uint32_t service;
> +	unsigned int active_devs;
> +	struct akcipher_alg algo;
> +};
> +
> +static DEFINE_MUTEX(algs_lock);
> +
> +static void virtio_crypto_akcipher_finalize_req(
> +	struct virtio_crypto_akcipher_request *vc_akcipher_req,
> +	struct akcipher_request *req, int err) {
> +	virtcrypto_clear_request(&vc_akcipher_req->base);
> +
> +	crypto_finalize_akcipher_request(vc_akcipher_req->base.dataq->engine,
> +req, err); }
> +
> +static void virtio_crypto_dataq_akcipher_callback(struct
> +virtio_crypto_request *vc_req, int len) {
> +	struct virtio_crypto_akcipher_request *vc_akcipher_req =
> +		container_of(vc_req, struct virtio_crypto_akcipher_request, base);
> +	struct akcipher_request *akcipher_req;
> +	int error;
> +
> +	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;
> +
> +	case VIRTIO_CRYPTO_KEY_REJECTED:
> +		error = -EKEYREJECTED;
> +		break;
> +
> +	default:
> +		error = -EIO;
> +		break;
> +	}
> +
> +	akcipher_req = vc_akcipher_req->akcipher_req;
> +	sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst),
> +			    vc_akcipher_req->dst_buf, akcipher_req->dst_len);
> +	virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req,
> +error); }
> +
> +static int virtio_crypto_alg_akcipher_init_session(struct
> virtio_crypto_akcipher_ctx *ctx,
> +		struct virtio_crypto_ctrl_header *header, void *para,
> +		const uint8_t *key, unsigned int keylen) {
> +	struct scatterlist outhdr_sg, key_sg, inhdr_sg, *sgs[3];
> +	struct virtio_crypto *vcrypto = ctx->vcrypto;
> +	uint8_t *pkey;
> +	unsigned int inlen;
> +	int err;
> +	unsigned int num_out = 0, num_in = 0;
> +
> +	pkey = kmemdup(key, keylen, GFP_ATOMIC);
> +	if (!pkey)
> +		return -ENOMEM;
> +
> +	spin_lock(&vcrypto->ctrl_lock);
> +	memcpy(&vcrypto->ctrl.header, header, sizeof(vcrypto->ctrl.header));
> +	memcpy(&vcrypto->ctrl.u, para, sizeof(vcrypto->ctrl.u));
> +	vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
> +
> +	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> +	sgs[num_out++] = &outhdr_sg;
> +
> +	sg_init_one(&key_sg, pkey, keylen);
> +	sgs[num_out++] = &key_sg;
> +
> +	sg_init_one(&inhdr_sg, &vcrypto->input, sizeof(vcrypto->input));
> +	sgs[num_out + num_in++] = &inhdr_sg;
> +
> +	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
> GFP_ATOMIC);
> +	if (err < 0)
> +		goto out;
> +
> +	virtqueue_kick(vcrypto->ctrl_vq);
> +	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
> +	       !virtqueue_is_broken(vcrypto->ctrl_vq))
> +		cpu_relax();
> +
> +	if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	ctx->session_id = le64_to_cpu(vcrypto->input.session_id);
> +	ctx->session_valid = true;
> +	err = 0;
> +
> +out:
> +	spin_unlock(&vcrypto->ctrl_lock);
> +	kfree_sensitive(pkey);
> +
> +	if (err < 0)
> +		pr_err("virtio_crypto: Create session failed status: %u\n",
> +			le32_to_cpu(vcrypto->input.status));
> +
> +	return err;
> +}
> +
> +static int virtio_crypto_alg_akcipher_close_session(struct
> +virtio_crypto_akcipher_ctx *ctx) {
> +	struct scatterlist outhdr_sg, inhdr_sg, *sgs[2];
> +	struct virtio_crypto_destroy_session_req *destroy_session;
> +	struct virtio_crypto *vcrypto = ctx->vcrypto;
> +	unsigned int num_out = 0, num_in = 0, inlen;
> +	int err;
> +
> +	spin_lock(&vcrypto->ctrl_lock);
> +	if (!ctx->session_valid) {
> +		err = 0;
> +		goto out;
> +	}
> +	vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
> +	vcrypto->ctrl.header.opcode =
> cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
> +	vcrypto->ctrl.header.queue_id = 0;
> +
> +	destroy_session = &vcrypto->ctrl.u.destroy_session;
> +	destroy_session->session_id = cpu_to_le64(ctx->session_id);
> +
> +	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
> +	sgs[num_out++] = &outhdr_sg;
> +
> +	sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status,
> sizeof(vcrypto->ctrl_status.status));
> +	sgs[num_out + num_in++] = &inhdr_sg;
> +
> +	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
> GFP_ATOMIC);
> +	if (err < 0)
> +		goto out;
> +
> +	virtqueue_kick(vcrypto->ctrl_vq);
> +	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
> +	       !virtqueue_is_broken(vcrypto->ctrl_vq))
> +		cpu_relax();
> +
> +	if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
> +		err = -EINVAL;
> +		goto out;
> +	}
> +
> +	err = 0;
> +	ctx->session_valid = false;
> +
> +out:
> +	spin_unlock(&vcrypto->ctrl_lock);
> +	if (err < 0) {
> +		pr_err("virtio_crypto: Close session failed status: %u, session_id:
> 0x%llx\n",
> +			vcrypto->ctrl_status.status, destroy_session->session_id);
> +	}
> +
> +	return err;
> +}
> +
> +static int __virtio_crypto_akcipher_do_req(struct
> virtio_crypto_akcipher_request *vc_akcipher_req,
> +		struct akcipher_request *req, struct data_queue *data_vq) {
> +	struct virtio_crypto_akcipher_ctx *ctx = vc_akcipher_req->akcipher_ctx;
> +	struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
> +	struct virtio_crypto *vcrypto = ctx->vcrypto;
> +	struct virtio_crypto_op_data_req *req_data = vc_req->req_data;
> +	struct scatterlist *sgs[4], outhdr_sg, inhdr_sg, srcdata_sg, dstdata_sg;
> +	void *src_buf = NULL, *dst_buf = NULL;
> +	unsigned int num_out = 0, num_in = 0;
> +	int node = dev_to_node(&vcrypto->vdev->dev);
> +	unsigned long flags;
> +	int ret = -ENOMEM;
> +	bool verify = vc_akcipher_req->opcode ==
> VIRTIO_CRYPTO_AKCIPHER_VERIFY;
> +	unsigned int src_len = verify ? req->src_len + req->dst_len :
> +req->src_len;
> +
> +	/* out header */
> +	sg_init_one(&outhdr_sg, req_data, sizeof(*req_data));
> +	sgs[num_out++] = &outhdr_sg;
> +
> +	/* src data */
> +	src_buf = kcalloc_node(src_len, 1, GFP_KERNEL, node);
> +	if (!src_buf)
> +		goto err;
> +
> +	if (verify) {
> +		/* for verify operation, both src and dst data work as OUT direction */
> +		sg_copy_to_buffer(req->src, sg_nents(req->src), src_buf, src_len);
> +		sg_init_one(&srcdata_sg, src_buf, src_len);
> +		sgs[num_out++] = &srcdata_sg;
> +	} else {
> +		sg_copy_to_buffer(req->src, sg_nents(req->src), src_buf, src_len);
> +		sg_init_one(&srcdata_sg, src_buf, src_len);
> +		sgs[num_out++] = &srcdata_sg;
> +
> +		/* dst data */
> +		dst_buf = kcalloc_node(req->dst_len, 1, GFP_KERNEL, node);
> +		if (!dst_buf)
> +			goto err;
> +
> +		sg_init_one(&dstdata_sg, dst_buf, req->dst_len);
> +		sgs[num_out + num_in++] = &dstdata_sg;
> +	}
> +
> +	/* in header */
> +	sg_init_one(&inhdr_sg, &vc_req->status, sizeof(vc_req->status));
> +	sgs[num_out + num_in++] = &inhdr_sg;
> +
> +	spin_lock_irqsave(&data_vq->lock, flags);
> +	ret = virtqueue_add_sgs(data_vq->vq, sgs, num_out, num_in, vc_req,
> GFP_ATOMIC);
> +	virtqueue_kick(data_vq->vq);
> +	spin_unlock_irqrestore(&data_vq->lock, flags);
> +	if (ret)
> +		goto err;
> +
> +	vc_akcipher_req->src_buf = src_buf;
> +	vc_akcipher_req->dst_buf = dst_buf;
> +
> +	return 0;
> +
> +err:
> +	kfree(src_buf);
> +	kfree(dst_buf);
> +
> +	return -ENOMEM;
> +}
> +
> +static int virtio_crypto_rsa_do_req(struct crypto_engine *engine, void
> +*vreq) {
> +	struct akcipher_request *req = container_of(vreq, struct akcipher_request,
> base);
> +	struct virtio_crypto_akcipher_request *vc_akcipher_req =
> akcipher_request_ctx(req);
> +	struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
> +	struct virtio_crypto_akcipher_ctx *ctx = vc_akcipher_req->akcipher_ctx;
> +	struct virtio_crypto *vcrypto = ctx->vcrypto;
> +	struct data_queue *data_vq = vc_req->dataq;
> +	struct virtio_crypto_op_header *header;
> +	struct virtio_crypto_akcipher_data_req *akcipher_req;
> +	int ret;
> +
> +	vc_req->sgs = NULL;
> +	vc_req->req_data = kzalloc_node(sizeof(*vc_req->req_data),
> +		GFP_KERNEL, dev_to_node(&vcrypto->vdev->dev));
> +	if (!vc_req->req_data)
> +		return -ENOMEM;
> +
> +	/* build request header */
> +	header = &vc_req->req_data->header;
> +	header->opcode = cpu_to_le32(vc_akcipher_req->opcode);
> +	header->algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
> +	header->session_id = cpu_to_le64(ctx->session_id);
> +
> +	/* build request akcipher data */
> +	akcipher_req = &vc_req->req_data->u.akcipher_req;
> +	akcipher_req->para.src_data_len = cpu_to_le32(req->src_len);
> +	akcipher_req->para.dst_data_len = cpu_to_le32(req->dst_len);
> +
> +	ret = __virtio_crypto_akcipher_do_req(vc_akcipher_req, req, data_vq);
> +	if (ret < 0) {
> +		kfree_sensitive(vc_req->req_data);
> +		vc_req->req_data = NULL;
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int virtio_crypto_rsa_req(struct akcipher_request *req, uint32_t
> +opcode) {
> +	struct crypto_akcipher *atfm = crypto_akcipher_reqtfm(req);
> +	struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(atfm);
> +	struct virtio_crypto_akcipher_request *vc_akcipher_req =
> akcipher_request_ctx(req);
> +	struct virtio_crypto_request *vc_req = &vc_akcipher_req->base;
> +	struct virtio_crypto *vcrypto = ctx->vcrypto;
> +	/* Use the first data virtqueue as default */
> +	struct data_queue *data_vq = &vcrypto->data_vq[0];
> +
> +	vc_req->dataq = data_vq;
> +	vc_req->alg_cb = virtio_crypto_dataq_akcipher_callback;
> +	vc_akcipher_req->akcipher_ctx = ctx;
> +	vc_akcipher_req->akcipher_req = req;
> +	vc_akcipher_req->opcode = opcode;
> +
> +	return crypto_transfer_akcipher_request_to_engine(data_vq->engine,
> +req); }
> +
> +static int virtio_crypto_rsa_encrypt(struct akcipher_request *req) {
> +	return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_ENCRYPT); }
> +
> +static int virtio_crypto_rsa_decrypt(struct akcipher_request *req) {
> +	return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_DECRYPT); }
> +
> +static int virtio_crypto_rsa_sign(struct akcipher_request *req) {
> +	return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_SIGN); }
> +
> +static int virtio_crypto_rsa_verify(struct akcipher_request *req) {
> +	return virtio_crypto_rsa_req(req, VIRTIO_CRYPTO_AKCIPHER_VERIFY); }
> +
> +static int virtio_crypto_rsa_set_key(struct crypto_akcipher *tfm,
> +				     const void *key,
> +				     unsigned int keylen,
> +				     bool private,
> +				     int padding_algo,
> +				     int hash_algo)
> +{
> +	struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
> +	struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
> +	struct virtio_crypto *vcrypto;
> +	struct virtio_crypto_ctrl_header header;
> +	struct virtio_crypto_akcipher_session_para para;
> +	struct rsa_key rsa_key = {0};
> +	int node = virtio_crypto_get_current_node();
> +	uint32_t keytype;
> +	int ret;
> +
> +	/* mpi_free will test n, just free it. */
> +	mpi_free(rsa_ctx->n);
> +	rsa_ctx->n = NULL;
> +
> +	if (private) {
> +		keytype = VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PRIVATE;
> +		ret = rsa_parse_priv_key(&rsa_key, key, keylen);
> +	} else {
> +		keytype = VIRTIO_CRYPTO_AKCIPHER_KEY_TYPE_PUBLIC;
> +		ret = rsa_parse_pub_key(&rsa_key, key, keylen);
> +	}
> +
> +	if (ret)
> +		return ret;
> +
> +	rsa_ctx->n = mpi_read_raw_data(rsa_key.n, rsa_key.n_sz);
> +	if (!rsa_ctx->n)
> +		return -ENOMEM;
> +
> +	if (!ctx->vcrypto) {
> +		vcrypto = virtcrypto_get_dev_node(node,
> VIRTIO_CRYPTO_SERVICE_AKCIPHER,
> +						VIRTIO_CRYPTO_AKCIPHER_RSA);
> +		if (!vcrypto) {
> +			pr_err("virtio_crypto: Could not find a virtio device in the system
> or unsupported algo\n");
> +			return -ENODEV;
> +		}
> +
> +		ctx->vcrypto = vcrypto;
> +	} else {
> +		virtio_crypto_alg_akcipher_close_session(ctx);
> +	}
> +
> +	/* set ctrl header */
> +	header.opcode =
> 	cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_CREATE_SESSION);
> +	header.algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
> +	header.queue_id = 0;
> +
> +	/* set RSA para */
> +	para.algo = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_RSA);
> +	para.keytype = cpu_to_le32(keytype);
> +	para.keylen = cpu_to_le32(keylen);
> +	para.u.rsa.padding_algo = cpu_to_le32(padding_algo);
> +	para.u.rsa.hash_algo = cpu_to_le32(hash_algo);
> +
> +	return virtio_crypto_alg_akcipher_init_session(ctx, &header, &para,
> +key, keylen); }
> +
> +static int virtio_crypto_rsa_raw_set_priv_key(struct crypto_akcipher *tfm,
> +					      const void *key,
> +					      unsigned int keylen)
> +{
> +	return virtio_crypto_rsa_set_key(tfm, key, keylen, 1,
> +					 VIRTIO_CRYPTO_RSA_RAW_PADDING,
> +					 VIRTIO_CRYPTO_RSA_NO_HASH);
> +}
> +
> +
> +static int virtio_crypto_p1pad_rsa_sha1_set_priv_key(struct crypto_akcipher
> *tfm,
> +						     const void *key,
> +						     unsigned int keylen)
> +{
> +	return virtio_crypto_rsa_set_key(tfm, key, keylen, 1,
> +					 VIRTIO_CRYPTO_RSA_PKCS1_PADDING,
> +					 VIRTIO_CRYPTO_RSA_SHA1);
> +}
> +
> +static int virtio_crypto_rsa_raw_set_pub_key(struct crypto_akcipher *tfm,
> +					     const void *key,
> +					     unsigned int keylen)
> +{
> +	return virtio_crypto_rsa_set_key(tfm, key, keylen, 0,
> +					 VIRTIO_CRYPTO_RSA_RAW_PADDING,
> +					 VIRTIO_CRYPTO_RSA_NO_HASH);
> +}
> +
> +static int virtio_crypto_p1pad_rsa_sha1_set_pub_key(struct crypto_akcipher
> *tfm,
> +						    const void *key,
> +						    unsigned int keylen)
> +{
> +	return virtio_crypto_rsa_set_key(tfm, key, keylen, 0,
> +					 VIRTIO_CRYPTO_RSA_PKCS1_PADDING,
> +					 VIRTIO_CRYPTO_RSA_SHA1);
> +}
> +
> +static unsigned int virtio_crypto_rsa_max_size(struct crypto_akcipher
> +*tfm) {
> +	struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
> +	struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
> +
> +	return mpi_get_size(rsa_ctx->n);
> +}
> +
> +static int virtio_crypto_rsa_init_tfm(struct crypto_akcipher *tfm) {
> +	struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
> +
> +	ctx->tfm = tfm;
> +	ctx->enginectx.op.do_one_request = virtio_crypto_rsa_do_req;
> +	ctx->enginectx.op.prepare_request = NULL;
> +	ctx->enginectx.op.unprepare_request = NULL;
> +
> +	return 0;
> +}
> +
> +static void virtio_crypto_rsa_exit_tfm(struct crypto_akcipher *tfm) {
> +	struct virtio_crypto_akcipher_ctx *ctx = akcipher_tfm_ctx(tfm);
> +	struct virtio_crypto_rsa_ctx *rsa_ctx = &ctx->rsa_ctx;
> +
> +	virtio_crypto_alg_akcipher_close_session(ctx);
> +	virtcrypto_dev_put(ctx->vcrypto);
> +	mpi_free(rsa_ctx->n);
> +	rsa_ctx->n = NULL;
> +}
> +
> +static struct virtio_crypto_akcipher_algo virtio_crypto_akcipher_algs[] = {
> +	{
> +		.algonum = VIRTIO_CRYPTO_AKCIPHER_RSA,
> +		.service = VIRTIO_CRYPTO_SERVICE_AKCIPHER,
> +		.algo = {
> +			.encrypt = virtio_crypto_rsa_encrypt,
> +			.decrypt = virtio_crypto_rsa_decrypt,
> +			.set_pub_key = virtio_crypto_rsa_raw_set_pub_key,
> +			.set_priv_key = virtio_crypto_rsa_raw_set_priv_key,
> +			.max_size = virtio_crypto_rsa_max_size,
> +			.init = virtio_crypto_rsa_init_tfm,
> +			.exit = virtio_crypto_rsa_exit_tfm,
> +			.reqsize = sizeof(struct virtio_crypto_akcipher_request),
> +			.base = {
> +				.cra_name = "rsa",
> +				.cra_driver_name = "virtio-crypto-rsa",
> +				.cra_priority = 150,
> +				.cra_module = THIS_MODULE,
> +				.cra_ctxsize = sizeof(struct virtio_crypto_akcipher_ctx),
> +			},
> +		},
> +	},
> +	{
> +		.algonum = VIRTIO_CRYPTO_AKCIPHER_RSA,
> +		.service = VIRTIO_CRYPTO_SERVICE_AKCIPHER,
> +		.algo = {
> +			.encrypt = virtio_crypto_rsa_encrypt,
> +			.decrypt = virtio_crypto_rsa_decrypt,
> +			.sign = virtio_crypto_rsa_sign,
> +			.verify = virtio_crypto_rsa_verify,
> +			.set_pub_key = virtio_crypto_p1pad_rsa_sha1_set_pub_key,
> +			.set_priv_key = virtio_crypto_p1pad_rsa_sha1_set_priv_key,
> +			.max_size = virtio_crypto_rsa_max_size,
> +			.init = virtio_crypto_rsa_init_tfm,
> +			.exit = virtio_crypto_rsa_exit_tfm,
> +			.reqsize = sizeof(struct virtio_crypto_akcipher_request),
> +			.base = {
> +				.cra_name = "pkcs1pad(rsa,sha1)",
> +				.cra_driver_name = "virtio-pkcs1-rsa-with-sha1",
> +				.cra_priority = 150,
> +				.cra_module = THIS_MODULE,
> +				.cra_ctxsize = sizeof(struct virtio_crypto_akcipher_ctx),
> +			},
> +		},
> +	},
> +};
> +
> +int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto)
> +{
> +	int ret = 0;
> +	int i = 0;
> +
> +	mutex_lock(&algs_lock);
> +
> +	for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
> +		uint32_t service = virtio_crypto_akcipher_algs[i].service;
> +		uint32_t algonum = virtio_crypto_akcipher_algs[i].algonum;
> +
> +		if (!virtcrypto_algo_is_supported(vcrypto, service, algonum))
> +			continue;
> +
> +		if (virtio_crypto_akcipher_algs[i].active_devs == 0) {
> +			ret =
> crypto_register_akcipher(&virtio_crypto_akcipher_algs[i].algo);
> +			if (ret)
> +				goto unlock;
> +		}
> +
> +		virtio_crypto_akcipher_algs[i].active_devs++;
> +		dev_info(&vcrypto->vdev->dev, "Registered akcipher algo %s\n",
> +			 virtio_crypto_akcipher_algs[i].algo.base.cra_name);
> +	}
> +
> +unlock:
> +	mutex_unlock(&algs_lock);
> +	return ret;
> +}
> +
> +void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto
> +*vcrypto) {
> +	int i = 0;
> +
> +	mutex_lock(&algs_lock);
> +
> +	for (i = 0; i < ARRAY_SIZE(virtio_crypto_akcipher_algs); i++) {
> +		uint32_t service = virtio_crypto_akcipher_algs[i].service;
> +		uint32_t algonum = virtio_crypto_akcipher_algs[i].algonum;
> +
> +		if (virtio_crypto_akcipher_algs[i].active_devs == 0 ||
> +		    !virtcrypto_algo_is_supported(vcrypto, service, algonum))
> +			continue;
> +
> +		if (virtio_crypto_akcipher_algs[i].active_devs == 1)
> +
> 	crypto_unregister_akcipher(&virtio_crypto_akcipher_algs[i].algo);
> +
> +		virtio_crypto_akcipher_algs[i].active_devs--;
> +	}
> +
> +	mutex_unlock(&algs_lock);
> +}

Why don't you reuse the virtio_crypto_algs_register/unregister functions? 
The current code is too repetitive. Maybe we don't need create the new file virtio_crypto_akcipher_algo.c
because we had virtio_crypto_algs.c which includes all algorithms.

> diff --git a/drivers/crypto/virtio/virtio_crypto_common.h
> b/drivers/crypto/virtio/virtio_crypto_common.h
> index a24f85c589e7..214f9a6fcf84 100644
> --- a/drivers/crypto/virtio/virtio_crypto_common.h
> +++ b/drivers/crypto/virtio/virtio_crypto_common.h
> @@ -56,6 +56,7 @@ struct virtio_crypto {
>  	u32 mac_algo_l;
>  	u32 mac_algo_h;
>  	u32 aead_algo;
> +	u32 akcipher_algo;
> 
>  	/* Maximum length of cipher key */
>  	u32 max_cipher_key_len;
> @@ -131,5 +132,7 @@ static inline int virtio_crypto_get_current_node(void)
> 
>  int virtio_crypto_algs_register(struct virtio_crypto *vcrypto);  void
> virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto);
> +int virtio_crypto_akcipher_algs_register(struct virtio_crypto
> +*vcrypto); void virtio_crypto_akcipher_algs_unregister(struct
> +virtio_crypto *vcrypto);
> 
>  #endif /* _VIRTIO_CRYPTO_COMMON_H */
> diff --git a/drivers/crypto/virtio/virtio_crypto_core.c
> b/drivers/crypto/virtio/virtio_crypto_core.c
> index 8e977b7627cb..c6f482db0bc0 100644
> --- a/drivers/crypto/virtio/virtio_crypto_core.c
> +++ b/drivers/crypto/virtio/virtio_crypto_core.c
> @@ -297,6 +297,7 @@ static int virtcrypto_probe(struct virtio_device *vdev)
>  	u32 mac_algo_l = 0;
>  	u32 mac_algo_h = 0;
>  	u32 aead_algo = 0;
> +	u32 akcipher_algo = 0;
>  	u32 crypto_services = 0;
> 
>  	if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) @@ -348,6 +349,9 @@
> static int virtcrypto_probe(struct virtio_device *vdev)
>  			mac_algo_h, &mac_algo_h);
>  	virtio_cread_le(vdev, struct virtio_crypto_config,
>  			aead_algo, &aead_algo);
> +	if (crypto_services & (1 << VIRTIO_CRYPTO_SERVICE_AKCIPHER))
> +		virtio_cread_le(vdev, struct virtio_crypto_config,
> +				akcipher_algo, &akcipher_algo);
> 
>  	/* Add virtio crypto device to global table */
>  	err = virtcrypto_devmgr_add_dev(vcrypto);
> @@ -374,7 +378,7 @@ static int virtcrypto_probe(struct virtio_device *vdev)
>  	vcrypto->mac_algo_h = mac_algo_h;
>  	vcrypto->hash_algo = hash_algo;
>  	vcrypto->aead_algo = aead_algo;
> -
> +	vcrypto->akcipher_algo = akcipher_algo;
> 
>  	dev_info(&vdev->dev,
>  		"max_queues: %u, max_cipher_key_len: %u, max_auth_key_len: %u,
> max_size 0x%llx\n", diff --git a/drivers/crypto/virtio/virtio_crypto_mgr.c
> b/drivers/crypto/virtio/virtio_crypto_mgr.c
> index 6860f8180c7c..1cb92418b321 100644
> --- a/drivers/crypto/virtio/virtio_crypto_mgr.c
> +++ b/drivers/crypto/virtio/virtio_crypto_mgr.c
> @@ -242,6 +242,12 @@ int virtcrypto_dev_start(struct virtio_crypto *vcrypto)
>  		return -EFAULT;
>  	}
> 
> +	if (virtio_crypto_akcipher_algs_register(vcrypto)) {
> +		pr_err("virtio_crypto: Failed to register crypto akcipher algs\n");
> +		virtio_crypto_algs_unregister(vcrypto);
> +		return -EFAULT;
> +	}
> +

If so, the above codes can be removed too.

>  	return 0;
>  }
> 
> @@ -258,6 +264,7 @@ int virtcrypto_dev_start(struct virtio_crypto *vcrypto)
> void virtcrypto_dev_stop(struct virtio_crypto *vcrypto)  {
>  	virtio_crypto_algs_unregister(vcrypto);
> +	virtio_crypto_akcipher_algs_unregister(vcrypto);
>  }
> 
>  /*
> @@ -312,6 +319,10 @@ bool virtcrypto_algo_is_supported(struct virtio_crypto
> *vcrypto,
>  	case VIRTIO_CRYPTO_SERVICE_AEAD:
>  		algo_mask = vcrypto->aead_algo;
>  		break;
> +
> +	case VIRTIO_CRYPTO_SERVICE_AKCIPHER:
> +		algo_mask = vcrypto->akcipher_algo;
> +		break;
>  	}
> 
>  	if (!(algo_mask & (1u << algo)))
> --
> 2.20.1

Regards,
-Gonglei