[PATCH v3 01/10] crypto: virtio: Add spinlock protection with virtqueue notification

[PATCH v3 01/10] crypto: virtio: Add spinlock protection with virtqueue notification

[Bibo Mao]

When VM boots with one virtio-crypto PCI device and builtin backend,
run openssl benchmark command with multiple processes, such as
  openssl speed -evp aes-128-cbc -engine afalg  -seconds 10 -multi 32

openssl processes will hangup and there is error reported like this:
 virtio_crypto virtio0: dataq.0:id 3 is not a head!

It seems that the data virtqueue need protection when it is handled
for virtio done notification. If the spinlock protection is added
in virtcrypto_done_task(), openssl benchmark with multiple processes
works well.

Fixes: fed93fb62e05 ("crypto: virtio - Handle dataq logic with tasklet")
Cc: stable@vger.kernel.org
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 drivers/crypto/virtio/virtio_crypto_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/crypto/virtio/virtio_crypto_core.c b/drivers/crypto/virtio/virtio_crypto_core.c
index 3d241446099c..ccc6b5c1b24b 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -75,15 +75,20 @@ static void virtcrypto_done_task(unsigned long data)
 	struct data_queue *data_vq = (struct data_queue *)data;
 	struct virtqueue *vq = data_vq->vq;
 	struct virtio_crypto_request *vc_req;
+	unsigned long flags;
 	unsigned int len;
 
+	spin_lock_irqsave(&data_vq->lock, flags);
 	do {
 		virtqueue_disable_cb(vq);
 		while ((vc_req = virtqueue_get_buf(vq, &len)) != NULL) {
+			spin_unlock_irqrestore(&data_vq->lock, flags);
 			if (vc_req->alg_cb)
 				vc_req->alg_cb(vc_req, len);
+			spin_lock_irqsave(&data_vq->lock, flags);
 		}
 	} while (!virtqueue_enable_cb(vq));
+	spin_unlock_irqrestore(&data_vq->lock, flags);
 }
 
 static void virtcrypto_dataq_callback(struct virtqueue *vq)
-- 
2.39.3

Re: [PATCH v3 01/10] crypto: virtio: Add spinlock protection with virtqueue notification

[Jason Wang]

On Tue, Dec 9, 2025 at 10:23 AM Bibo Mao <maobibo@loongson.cn> wrote:
>
> When VM boots with one virtio-crypto PCI device and builtin backend,
> run openssl benchmark command with multiple processes, such as
>   openssl speed -evp aes-128-cbc -engine afalg  -seconds 10 -multi 32
>
> openssl processes will hangup and there is error reported like this:
>  virtio_crypto virtio0: dataq.0:id 3 is not a head!
>
> It seems that the data virtqueue need protection when it is handled
> for virtio done notification. If the spinlock protection is added
> in virtcrypto_done_task(), openssl benchmark with multiple processes
> works well.
>
> Fixes: fed93fb62e05 ("crypto: virtio - Handle dataq logic with tasklet")
> Cc: stable@vger.kernel.org
> Signed-off-by: Bibo Mao <maobibo@loongson.cn>

Acked-by: Jason Wang <jasowang@redhat.com>

Thanks

[PATCH v3 02/10] crypto: virtio: Remove duplicated virtqueue_kick in virtio_crypto_skcipher_crypt_req

[Bibo Mao]

With function virtio_crypto_skcipher_crypt_req(), there is already
virtqueue_kick() call with spinlock held in funtion
__virtio_crypto_skcipher_do_req(). Remove duplicated virtqueue_kick()
function call here.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 drivers/crypto/virtio/virtio_crypto_skcipher_algs.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 1b3fb21a2a7d..11053d1786d4 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -541,8 +541,6 @@ int virtio_crypto_skcipher_crypt_req(
 	if (ret < 0)
 		return ret;
 
-	virtqueue_kick(data_vq->vq);
-
 	return 0;
 }
 
-- 
2.39.3

[PATCH v3 03/10] crypto: virtio: Replace package id with numa node id

[Bibo Mao]

With multiple virtio crypto devices supported with different NUMA
nodes, when crypto session is created, it will search virtio crypto
device with the same numa node of current CPU.

Here API topology_physical_package_id() is replaced with cpu_to_node()
since package id is physical concept, and one package id have multiple
memory numa id.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 drivers/crypto/virtio/virtio_crypto_common.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_common.h b/drivers/crypto/virtio/virtio_crypto_common.h
index 19c934af3df6..e559bdadf4f9 100644
--- a/drivers/crypto/virtio/virtio_crypto_common.h
+++ b/drivers/crypto/virtio/virtio_crypto_common.h
@@ -135,7 +135,7 @@ static inline int virtio_crypto_get_current_node(void)
 	int cpu, node;
 
 	cpu = get_cpu();
-	node = topology_physical_package_id(cpu);
+	node = cpu_to_node(cpu);
 	put_cpu();
 
 	return node;
-- 
2.39.3

[PATCH v3 04/10] crypto: virtio: Add algo pointer in virtio_crypto_skcipher_ctx

[Bibo Mao]

Structure virtio_crypto_skcipher_ctx is allocated together with
crypto_skcipher, and skcipher_alg is set in strucutre crypto_skcipher
when it is created.

Here add virtio_crypto_algo pointer in virtio_crypto_skcipher_ctx and
set it in function virtio_crypto_skcipher_init(). So crypto service
and algo can be acquired from virtio_crypto_algo pointer.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 20 ++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 11053d1786d4..8a139de3d064 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -15,9 +15,11 @@
 #include "virtio_crypto_common.h"
 
 
+struct virtio_crypto_algo;
 struct virtio_crypto_skcipher_ctx {
 	struct virtio_crypto *vcrypto;
 
+	struct virtio_crypto_algo *alg;
 	struct virtio_crypto_sym_session_info enc_sess_info;
 	struct virtio_crypto_sym_session_info dec_sess_info;
 };
@@ -108,9 +110,7 @@ virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
 
 static int virtio_crypto_alg_skcipher_init_session(
 		struct virtio_crypto_skcipher_ctx *ctx,
-		uint32_t alg, const uint8_t *key,
-		unsigned int keylen,
-		int encrypt)
+		const uint8_t *key, unsigned int keylen, int encrypt)
 {
 	struct scatterlist outhdr, key_sg, inhdr, *sgs[3];
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
@@ -140,7 +140,7 @@ static int virtio_crypto_alg_skcipher_init_session(
 	/* Pad ctrl header */
 	ctrl = &vc_ctrl_req->ctrl;
 	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
-	ctrl->header.algo = cpu_to_le32(alg);
+	ctrl->header.algo = cpu_to_le32(ctx->alg->algonum);
 	/* Set the default dataqueue id to 0 */
 	ctrl->header.queue_id = 0;
 
@@ -261,13 +261,11 @@ static int virtio_crypto_alg_skcipher_init_sessions(
 		return -EINVAL;
 
 	/* Create encryption session */
-	ret = virtio_crypto_alg_skcipher_init_session(ctx,
-			alg, key, keylen, 1);
+	ret = virtio_crypto_alg_skcipher_init_session(ctx, key, keylen, 1);
 	if (ret)
 		return ret;
 	/* Create decryption session */
-	ret = virtio_crypto_alg_skcipher_init_session(ctx,
-			alg, key, keylen, 0);
+	ret = virtio_crypto_alg_skcipher_init_session(ctx, key, keylen, 0);
 	if (ret) {
 		virtio_crypto_alg_skcipher_close_session(ctx, 1);
 		return ret;
@@ -293,7 +291,7 @@ static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
 		int node = virtio_crypto_get_current_node();
 		struct virtio_crypto *vcrypto =
 				      virtcrypto_get_dev_node(node,
-				      VIRTIO_CRYPTO_SERVICE_CIPHER, alg);
+				      ctx->alg->service, ctx->alg->algonum);
 		if (!vcrypto) {
 			pr_err("virtio_crypto: Could not find a virtio device in the system or unsupported algo\n");
 			return -ENODEV;
@@ -509,7 +507,11 @@ static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
 
 static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
 {
+	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+
 	crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
+	ctx->alg = container_of(alg, struct virtio_crypto_algo, algo.base);
 
 	return 0;
 }
-- 
2.39.3

[PATCH v3 05/10] crypto: virtio: Use generic API aes_check_keylen()

[Bibo Mao]

With AES algo, generic API aes_check_keylen() is used to check length
of key.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 20 ++++++++-----------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 8a139de3d064..682d192a4ed7 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -94,18 +94,16 @@ static u64 virtio_crypto_alg_sg_nents_length(struct scatterlist *sg)
 }
 
 static int
-virtio_crypto_alg_validate_key(int key_len, uint32_t *alg)
+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;
+	switch (alg) {
+	case VIRTIO_CRYPTO_CIPHER_AES_ECB:
+	case VIRTIO_CRYPTO_CIPHER_AES_CBC:
+	case VIRTIO_CRYPTO_CIPHER_AES_CTR:
+		return aes_check_keylen(key_len);
 	default:
 		return -EINVAL;
 	}
-	return 0;
 }
 
 static int virtio_crypto_alg_skcipher_init_session(
@@ -248,7 +246,6 @@ static int virtio_crypto_alg_skcipher_init_sessions(
 		struct virtio_crypto_skcipher_ctx *ctx,
 		const uint8_t *key, unsigned int keylen)
 {
-	uint32_t alg;
 	int ret;
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
 
@@ -257,7 +254,7 @@ static int virtio_crypto_alg_skcipher_init_sessions(
 		return -EINVAL;
 	}
 
-	if (virtio_crypto_alg_validate_key(keylen, &alg))
+	if (virtio_crypto_alg_validate_key(keylen, ctx->alg->algonum))
 		return -EINVAL;
 
 	/* Create encryption session */
@@ -279,10 +276,9 @@ static int virtio_crypto_skcipher_setkey(struct crypto_skcipher *tfm,
 					 unsigned int keylen)
 {
 	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
-	uint32_t alg;
 	int ret;
 
-	ret = virtio_crypto_alg_validate_key(keylen, &alg);
+	ret = virtio_crypto_alg_validate_key(keylen, ctx->alg->algonum);
 	if (ret)
 		return ret;
 
-- 
2.39.3

[PATCH v3 06/10] crypto: virtio: Remove AES specified marcro AES_BLOCK_SIZE

[Bibo Mao]

Macro AES_BLOCK_SIZE is meaningful only for algo AES, replace it
with generic API crypto_skcipher_blocksize(), so that new algo can
be added in later.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../crypto/virtio/virtio_crypto_skcipher_algs.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 682d192a4ed7..788d2d4a9b83 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -416,8 +416,8 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	memcpy(iv, req->iv, ivsize);
 	if (!vc_sym_req->encrypt)
 		scatterwalk_map_and_copy(req->iv, req->src,
-					 req->cryptlen - AES_BLOCK_SIZE,
-					 AES_BLOCK_SIZE, 0);
+					 req->cryptlen - ivsize,
+					 ivsize, 0);
 
 	sg_init_one(&iv_sg, iv, ivsize);
 	sgs[num_out++] = &iv_sg;
@@ -459,6 +459,7 @@ static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
 	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
+	unsigned int blocksize = crypto_skcipher_blocksize(atfm);
 	struct virtio_crypto_sym_request *vc_sym_req =
 				skcipher_request_ctx(req);
 	struct virtio_crypto_request *vc_req = &vc_sym_req->base;
@@ -468,7 +469,7 @@ static int virtio_crypto_skcipher_encrypt(struct skcipher_request *req)
 
 	if (!req->cryptlen)
 		return 0;
-	if (req->cryptlen % AES_BLOCK_SIZE)
+	if (req->cryptlen % blocksize)
 		return -EINVAL;
 
 	vc_req->dataq = data_vq;
@@ -482,6 +483,7 @@ static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
 {
 	struct crypto_skcipher *atfm = crypto_skcipher_reqtfm(req);
 	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(atfm);
+	unsigned int blocksize = crypto_skcipher_blocksize(atfm);
 	struct virtio_crypto_sym_request *vc_sym_req =
 				skcipher_request_ctx(req);
 	struct virtio_crypto_request *vc_req = &vc_sym_req->base;
@@ -491,7 +493,7 @@ static int virtio_crypto_skcipher_decrypt(struct skcipher_request *req)
 
 	if (!req->cryptlen)
 		return 0;
-	if (req->cryptlen % AES_BLOCK_SIZE)
+	if (req->cryptlen % blocksize)
 		return -EINVAL;
 
 	vc_req->dataq = data_vq;
@@ -547,10 +549,13 @@ static void virtio_crypto_skcipher_finalize_req(
 	struct skcipher_request *req,
 	int err)
 {
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	unsigned int ivsize = crypto_skcipher_ivsize(tfm);
+
 	if (vc_sym_req->encrypt)
 		scatterwalk_map_and_copy(req->iv, req->dst,
-					 req->cryptlen - AES_BLOCK_SIZE,
-					 AES_BLOCK_SIZE, 0);
+					 req->cryptlen - ivsize,
+					 ivsize, 0);
 	kfree_sensitive(vc_sym_req->iv);
 	virtcrypto_clear_request(&vc_sym_req->base);
 
-- 
2.39.3

[PATCH v3 07/10] crypto: virtio: Add req_data with structure virtio_crypto_sym_request

[Bibo Mao]

With normal encrypt/decrypt workflow, req_data with struct type
virtio_crypto_op_data_req will be allocated. Here put req_data in
virtio_crypto_sym_request, it is pre-allocated when encrypt/decrypt
interface is called.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 drivers/crypto/virtio/virtio_crypto_skcipher_algs.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 788d2d4a9b83..bf9fdf56c2a3 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -26,6 +26,7 @@ struct virtio_crypto_skcipher_ctx {
 
 struct virtio_crypto_sym_request {
 	struct virtio_crypto_request base;
+	struct virtio_crypto_op_data_req req_data;
 
 	/* Cipher or aead */
 	uint32_t type;
@@ -350,14 +351,8 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	if (!sgs)
 		return -ENOMEM;
 
-	req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
-				dev_to_node(&vcrypto->vdev->dev));
-	if (!req_data) {
-		kfree(sgs);
-		return -ENOMEM;
-	}
-
-	vc_req->req_data = req_data;
+	req_data = &vc_sym_req->req_data;
+	vc_req->req_data = NULL;
 	vc_sym_req->type = VIRTIO_CRYPTO_SYM_OP_CIPHER;
 	/* Head of operation */
 	if (vc_sym_req->encrypt) {
@@ -450,7 +445,7 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 free_iv:
 	kfree_sensitive(iv);
 free:
-	kfree_sensitive(req_data);
+	memzero_explicit(req_data, sizeof(*req_data));
 	kfree(sgs);
 	return err;
 }
-- 
2.39.3

[PATCH v3 08/10] crypto: virtio: Add IV buffer in structure virtio_crypto_sym_request

[Bibo Mao]

Add IV buffer in structure virtio_crypto_sym_request to avoid unnecessary
IV buffer allocation in encrypt/decrypt process. And IV buffer is cleared
when encrypt/decrypt is finished.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c       | 18 +++++++-----------
 1 file changed, 7 insertions(+), 11 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index bf9fdf56c2a3..3d47e7c30c6b 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -30,9 +30,9 @@ struct virtio_crypto_sym_request {
 
 	/* Cipher or aead */
 	uint32_t type;
-	uint8_t *iv;
 	/* Encryption? */
 	bool encrypt;
+	uint8_t iv[0];
 };
 
 struct virtio_crypto_algo {
@@ -402,12 +402,7 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	 * 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;
-	}
+	iv = vc_sym_req->iv;
 	memcpy(iv, req->iv, ivsize);
 	if (!vc_sym_req->encrypt)
 		scatterwalk_map_and_copy(req->iv, req->src,
@@ -416,7 +411,6 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 
 	sg_init_one(&iv_sg, iv, ivsize);
 	sgs[num_out++] = &iv_sg;
-	vc_sym_req->iv = iv;
 
 	/* Source data */
 	for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
@@ -443,7 +437,7 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	return 0;
 
 free_iv:
-	kfree_sensitive(iv);
+	memzero_explicit(iv, ivsize);
 free:
 	memzero_explicit(req_data, sizeof(*req_data));
 	kfree(sgs);
@@ -502,8 +496,10 @@ static int virtio_crypto_skcipher_init(struct crypto_skcipher *tfm)
 {
 	struct virtio_crypto_skcipher_ctx *ctx = crypto_skcipher_ctx(tfm);
 	struct skcipher_alg *alg = crypto_skcipher_alg(tfm);
+	int size;
 
-	crypto_skcipher_set_reqsize(tfm, sizeof(struct virtio_crypto_sym_request));
+	size = sizeof(struct virtio_crypto_sym_request) + crypto_skcipher_ivsize(tfm);
+	crypto_skcipher_set_reqsize(tfm, size);
 	ctx->alg = container_of(alg, struct virtio_crypto_algo, algo.base);
 
 	return 0;
@@ -551,7 +547,7 @@ static void virtio_crypto_skcipher_finalize_req(
 		scatterwalk_map_and_copy(req->iv, req->dst,
 					 req->cryptlen - ivsize,
 					 ivsize, 0);
-	kfree_sensitive(vc_sym_req->iv);
+	memzero_explicit(vc_sym_req->iv, ivsize);
 	virtcrypto_clear_request(&vc_sym_req->base);
 
 	crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine,
-- 
2.39.3

[PATCH v3 09/10] crypto: virtio: Add skcipher support without IV

[Bibo Mao]

Some skcipher algo has no IV buffer such as ecb(aes) also, here add
checking with ivsize.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 39 +++++++++++--------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 3d47e7c30c6b..a5e6993da2ef 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -345,7 +345,9 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 			src_nents, dst_nents);
 
 	/* Why 3?  outhdr + iv + inhdr */
-	sg_total = src_nents + dst_nents + 3;
+	sg_total = src_nents + dst_nents + 2;
+	if (ivsize)
+		sg_total += 1;
 	sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
 				dev_to_node(&vcrypto->vdev->dev));
 	if (!sgs)
@@ -402,15 +404,17 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	 * Avoid to do DMA from the stack, switch to using
 	 * dynamically-allocated for the IV
 	 */
-	iv = vc_sym_req->iv;
-	memcpy(iv, req->iv, ivsize);
-	if (!vc_sym_req->encrypt)
-		scatterwalk_map_and_copy(req->iv, req->src,
-					 req->cryptlen - ivsize,
-					 ivsize, 0);
-
-	sg_init_one(&iv_sg, iv, ivsize);
-	sgs[num_out++] = &iv_sg;
+	if (ivsize) {
+		iv = vc_sym_req->iv;
+		memcpy(iv, req->iv, ivsize);
+		if (!vc_sym_req->encrypt)
+			scatterwalk_map_and_copy(req->iv, req->src,
+					req->cryptlen - ivsize,
+					ivsize, 0);
+
+		sg_init_one(&iv_sg, iv, ivsize);
+		sgs[num_out++] = &iv_sg;
+	}
 
 	/* Source data */
 	for (sg = req->src; src_nents; sg = sg_next(sg), src_nents--)
@@ -437,7 +441,8 @@ __virtio_crypto_skcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 	return 0;
 
 free_iv:
-	memzero_explicit(iv, ivsize);
+	if (ivsize)
+		memzero_explicit(iv, ivsize);
 free:
 	memzero_explicit(req_data, sizeof(*req_data));
 	kfree(sgs);
@@ -543,11 +548,13 @@ static void virtio_crypto_skcipher_finalize_req(
 	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
 	unsigned int ivsize = crypto_skcipher_ivsize(tfm);
 
-	if (vc_sym_req->encrypt)
-		scatterwalk_map_and_copy(req->iv, req->dst,
-					 req->cryptlen - ivsize,
-					 ivsize, 0);
-	memzero_explicit(vc_sym_req->iv, ivsize);
+	if (ivsize) {
+		if (vc_sym_req->encrypt)
+			scatterwalk_map_and_copy(req->iv, req->dst,
+					req->cryptlen - ivsize,
+					ivsize, 0);
+		memzero_explicit(vc_sym_req->iv, ivsize);
+	}
 	virtcrypto_clear_request(&vc_sym_req->base);
 
 	crypto_finalize_skcipher_request(vc_sym_req->base.dataq->engine,
-- 
2.39.3

[PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Bibo Mao]

ECB AES also is added here, its ivsize is zero and name is different
compared with CBC AES algo.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 74 +++++++++++++------
 1 file changed, 50 insertions(+), 24 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index a5e6993da2ef..193042e8e6ac 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -561,31 +561,57 @@ static void virtio_crypto_skcipher_finalize_req(
 					   req, err);
 }
 
-static struct virtio_crypto_algo virtio_crypto_algs[] = { {
-	.algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
-	.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
-	.algo.base = {
-		.base.cra_name		= "cbc(aes)",
-		.base.cra_driver_name	= "virtio_crypto_aes_cbc",
-		.base.cra_priority	= 150,
-		.base.cra_flags		= CRYPTO_ALG_ASYNC |
-					  CRYPTO_ALG_ALLOCATES_MEMORY,
-		.base.cra_blocksize	= AES_BLOCK_SIZE,
-		.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
-		.base.cra_module	= THIS_MODULE,
-		.init			= virtio_crypto_skcipher_init,
-		.exit			= virtio_crypto_skcipher_exit,
-		.setkey			= virtio_crypto_skcipher_setkey,
-		.decrypt		= virtio_crypto_skcipher_decrypt,
-		.encrypt		= virtio_crypto_skcipher_encrypt,
-		.min_keysize		= AES_MIN_KEY_SIZE,
-		.max_keysize		= AES_MAX_KEY_SIZE,
-		.ivsize			= AES_BLOCK_SIZE,
+static struct virtio_crypto_algo virtio_crypto_algs[] = {
+	{
+		.algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
+		.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
+		.algo.base = {
+			.base.cra_name		= "cbc(aes)",
+			.base.cra_driver_name	= "virtio_crypto_aes_cbc",
+			.base.cra_priority	= 150,
+			.base.cra_flags		= CRYPTO_ALG_ASYNC |
+				CRYPTO_ALG_ALLOCATES_MEMORY,
+			.base.cra_blocksize	= AES_BLOCK_SIZE,
+			.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
+			.base.cra_module	= THIS_MODULE,
+			.init			= virtio_crypto_skcipher_init,
+			.exit			= virtio_crypto_skcipher_exit,
+			.setkey			= virtio_crypto_skcipher_setkey,
+			.decrypt		= virtio_crypto_skcipher_decrypt,
+			.encrypt		= virtio_crypto_skcipher_encrypt,
+			.min_keysize		= AES_MIN_KEY_SIZE,
+			.max_keysize		= AES_MAX_KEY_SIZE,
+			.ivsize			= AES_BLOCK_SIZE,
+		},
+		.algo.op = {
+			.do_one_request = virtio_crypto_skcipher_crypt_req,
+		},
 	},
-	.algo.op = {
-		.do_one_request = virtio_crypto_skcipher_crypt_req,
-	},
-} };
+	{
+		.algonum = VIRTIO_CRYPTO_CIPHER_AES_ECB,
+		.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
+		.algo.base = {
+			.base.cra_name		= "ecb(aes)",
+			.base.cra_driver_name	= "virtio_crypto_aes_ecb",
+			.base.cra_priority	= 150,
+			.base.cra_flags		= CRYPTO_ALG_ASYNC |
+				CRYPTO_ALG_ALLOCATES_MEMORY,
+			.base.cra_blocksize	= AES_BLOCK_SIZE,
+			.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
+			.base.cra_module	= THIS_MODULE,
+			.init			= virtio_crypto_skcipher_init,
+			.exit			= virtio_crypto_skcipher_exit,
+			.setkey			= virtio_crypto_skcipher_setkey,
+			.decrypt		= virtio_crypto_skcipher_decrypt,
+			.encrypt		= virtio_crypto_skcipher_encrypt,
+			.min_keysize		= AES_MIN_KEY_SIZE,
+			.max_keysize		= AES_MAX_KEY_SIZE,
+		},
+		.algo.op = {
+			.do_one_request = virtio_crypto_skcipher_crypt_req,
+		},
+	}
+};
 
 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto)
 {
-- 
2.39.3

Re: [PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Eric Biggers]

On Tue, Dec 09, 2025 at 10:22:58AM +0800, Bibo Mao wrote:
> ECB AES also is added here, its ivsize is zero and name is different
> compared with CBC AES algo.

What is the use case for this feature?

- Eric

Re: [PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Bibo Mao]

On 2025/12/10 上午7:25, Eric Biggers wrote:
> On Tue, Dec 09, 2025 at 10:22:58AM +0800, Bibo Mao wrote:
>> ECB AES also is added here, its ivsize is zero and name is different
>> compared with CBC AES algo.
> 
> What is the use case for this feature?Currently qemu builtin backend and openssl afalg only support CBC AES, 
it depends on modified qemu and openssl to test this.

Maybe this patch adding ECB AES algo can be skipped now, it is just an 
example, the final target is to add SM4 cipher. currently virtio crypto 
has some problems such as:
1. there is RCU timeout issue with multiple AIO openssl processes
2. session number is limited with 256 so it is hard for actual use.

I want to solve these issues one by one.

Regards
Bibo Mao
> 
> - Eric
> 

Re: [PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Eric Biggers]

On Wed, Dec 10, 2025 at 09:36:06AM +0800, Bibo Mao wrote:
> 
> 
> On 2025/12/10 上午7:25, Eric Biggers wrote:
> > On Tue, Dec 09, 2025 at 10:22:58AM +0800, Bibo Mao wrote:
> > > ECB AES also is added here, its ivsize is zero and name is different
> > > compared with CBC AES algo.
> > 
> > What is the use case for this feature?Currently qemu builtin backend and
> > openssl afalg only support CBC AES,
> it depends on modified qemu and openssl to test this.
> 
> Maybe this patch adding ECB AES algo can be skipped now, it is just an
> example, the final target is to add SM4 cipher.

There's no need to add useless features.  The title of your patchset is
"crypto: virtio: Add ecb aes algo support".  So it sounds like the main
point of your patchset is to add a useless feature?  If there are
actually unrelated fixes you want, you should send those separately.

As for SM4 support (which mode?), if you really want that (you
shouldn't), why not use the existing CPU accelerated implementation?

- Eric

Re: [PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Bibo Mao]

On 2025/12/10 上午9:45, Eric Biggers wrote:
> On Wed, Dec 10, 2025 at 09:36:06AM +0800, Bibo Mao wrote:
>>
>>
>> On 2025/12/10 上午7:25, Eric Biggers wrote:
>>> On Tue, Dec 09, 2025 at 10:22:58AM +0800, Bibo Mao wrote:
>>>> ECB AES also is added here, its ivsize is zero and name is different
>>>> compared with CBC AES algo.
>>>
>>> What is the use case for this feature?Currently qemu builtin backend and
>>> openssl afalg only support CBC AES,
>> it depends on modified qemu and openssl to test this.
>>
>> Maybe this patch adding ECB AES algo can be skipped now, it is just an
>> example, the final target is to add SM4 cipher.
> 
> There's no need to add useless features.  The title of your patchset is
> "crypto: virtio: Add ecb aes algo support".  So it sounds like the main
> point of your patchset is to add a useless feature?  If there are
> actually unrelated fixes you want, you should send those separately.
yes, will change title of cover letter and remove this patch in next time.
> 
> As for SM4 support (which mode?), if you really want that (you
> shouldn't), why not use the existing CPU accelerated implementation?
The hardware supports SM4 ECB/CBC/CTL three modes, it depends on the 
detail application scenery.

I just notice that openssl removes engines support in recent. The 
purpose of use HW accel is that it is faster and can save CPU resource.

However it actually brings some troubles with applications on different 
HW platforms, I think HW crypto accel can be used for kernel and some 
key user applications, it is not suitable for all general applications 
for the present.

Regards
Bibo Mao
> 
> - Eric
> 

[PATCH v3 10/10] crypto: virtio: Add ecb aes algo support

[Bibo Mao]

ECB AES also is added here, its ivsize is zero and name is different
compared with CBC AES algo.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
---
 .../virtio/virtio_crypto_skcipher_algs.c      | 74 +++++++++++++------
 1 file changed, 50 insertions(+), 24 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index a5e6993da2ef..193042e8e6ac 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -561,31 +561,57 @@ static void virtio_crypto_skcipher_finalize_req(
 					   req, err);
 }
 
-static struct virtio_crypto_algo virtio_crypto_algs[] = { {
-	.algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
-	.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
-	.algo.base = {
-		.base.cra_name		= "cbc(aes)",
-		.base.cra_driver_name	= "virtio_crypto_aes_cbc",
-		.base.cra_priority	= 150,
-		.base.cra_flags		= CRYPTO_ALG_ASYNC |
-					  CRYPTO_ALG_ALLOCATES_MEMORY,
-		.base.cra_blocksize	= AES_BLOCK_SIZE,
-		.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
-		.base.cra_module	= THIS_MODULE,
-		.init			= virtio_crypto_skcipher_init,
-		.exit			= virtio_crypto_skcipher_exit,
-		.setkey			= virtio_crypto_skcipher_setkey,
-		.decrypt		= virtio_crypto_skcipher_decrypt,
-		.encrypt		= virtio_crypto_skcipher_encrypt,
-		.min_keysize		= AES_MIN_KEY_SIZE,
-		.max_keysize		= AES_MAX_KEY_SIZE,
-		.ivsize			= AES_BLOCK_SIZE,
+static struct virtio_crypto_algo virtio_crypto_algs[] = {
+	{
+		.algonum = VIRTIO_CRYPTO_CIPHER_AES_CBC,
+		.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
+		.algo.base = {
+			.base.cra_name		= "cbc(aes)",
+			.base.cra_driver_name	= "virtio_crypto_aes_cbc",
+			.base.cra_priority	= 150,
+			.base.cra_flags		= CRYPTO_ALG_ASYNC |
+				CRYPTO_ALG_ALLOCATES_MEMORY,
+			.base.cra_blocksize	= AES_BLOCK_SIZE,
+			.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
+			.base.cra_module	= THIS_MODULE,
+			.init			= virtio_crypto_skcipher_init,
+			.exit			= virtio_crypto_skcipher_exit,
+			.setkey			= virtio_crypto_skcipher_setkey,
+			.decrypt		= virtio_crypto_skcipher_decrypt,
+			.encrypt		= virtio_crypto_skcipher_encrypt,
+			.min_keysize		= AES_MIN_KEY_SIZE,
+			.max_keysize		= AES_MAX_KEY_SIZE,
+			.ivsize			= AES_BLOCK_SIZE,
+		},
+		.algo.op = {
+			.do_one_request = virtio_crypto_skcipher_crypt_req,
+		},
 	},
-	.algo.op = {
-		.do_one_request = virtio_crypto_skcipher_crypt_req,
-	},
-} };
+	{
+		.algonum = VIRTIO_CRYPTO_CIPHER_AES_ECB,
+		.service = VIRTIO_CRYPTO_SERVICE_CIPHER,
+		.algo.base = {
+			.base.cra_name		= "ecb(aes)",
+			.base.cra_driver_name	= "virtio_crypto_aes_ecb",
+			.base.cra_priority	= 150,
+			.base.cra_flags		= CRYPTO_ALG_ASYNC |
+				CRYPTO_ALG_ALLOCATES_MEMORY,
+			.base.cra_blocksize	= AES_BLOCK_SIZE,
+			.base.cra_ctxsize	= sizeof(struct virtio_crypto_skcipher_ctx),
+			.base.cra_module	= THIS_MODULE,
+			.init			= virtio_crypto_skcipher_init,
+			.exit			= virtio_crypto_skcipher_exit,
+			.setkey			= virtio_crypto_skcipher_setkey,
+			.decrypt		= virtio_crypto_skcipher_decrypt,
+			.encrypt		= virtio_crypto_skcipher_encrypt,
+			.min_keysize		= AES_MIN_KEY_SIZE,
+			.max_keysize		= AES_MAX_KEY_SIZE,
+		},
+		.algo.op = {
+			.do_one_request = virtio_crypto_skcipher_crypt_req,
+		},
+	}
+};
 
 int virtio_crypto_skcipher_algs_register(struct virtio_crypto *vcrypto)
 {
-- 
2.39.3