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zhenwei pi

2022-May-05 09:24 UTC

[PATCH v5 0/5] virtio-crypto: Improve performance

v4 -> v5:
 - Fix potentially dereferencing uninitialized variables in
   'virtio-crypto: use private buffer for control request'.
   Thanks to Dan Carpenter!

v3 -> v4:
 - Don't create new file virtio_common.c, the new functions are added
   into virtio_crypto_core.c
 - Split the first patch into two parts:
     1, change code style,
     2, use private buffer instead of shared buffer
 - Remove relevant change.
 - Other minor changes.

v2 -> v3:
 - Jason suggested that spliting the first patch into two part:
     1, using private buffer
     2, remove the busy polling
   Rework as Jason's suggestion, this makes the smaller change in
   each one and clear.

v1 -> v2:
 - Use kfree instead of kfree_sensitive for insensitive buffer.
 - Several coding style fix.
 - Use memory from current node, instead of memory close to device
 - Add more message in commit, also explain why removing per-device
   request buffer.
 - Add necessary comment in code to explain why using kzalloc to
   allocate struct virtio_crypto_ctrl_request.

v1:
The main point of this series is to improve the performance for
virtio crypto:
- Use wait mechanism instead of busy polling for ctrl queue, this
  reduces CPU and lock racing, it's possiable to create/destroy session
  parallelly, QPS increases from ~40K/s to ~200K/s.
- Enable retry on crypto engine to improve performance for data queue,
  this allows the larger depth instead of 1.
- Fix dst data length in akcipher service.
- Other style fix.

lei he (2):
  virtio-crypto: adjust dst_len at ops callback
  virtio-crypto: enable retry for virtio-crypto-dev

zhenwei pi (3):
  virtio-crypto: change code style
  virtio-crypto: use private buffer for control request
  virtio-crypto: wait ctrl queue instead of busy polling

 .../virtio/virtio_crypto_akcipher_algs.c      |  95 ++++++------
 drivers/crypto/virtio/virtio_crypto_common.h  |  21 ++-
 drivers/crypto/virtio/virtio_crypto_core.c    |  55 ++++++-
 .../virtio/virtio_crypto_skcipher_algs.c      | 140 ++++++++----------
 4 files changed, 182 insertions(+), 129 deletions(-)

-- 
2.20.1

zhenwei pi

2022-May-05 09:24 UTC

head link

[PATCH v5 1/5] virtio-crypto: change code style

Use temporary variable to make code easy to read and maintain.
	/* 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);
-->
	sym_create_session = &ctrl->u.sym_create_session;
	sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
	sym_create_session->u.cipher.para.algo = ctrl->header.algo;
	sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
	sym_create_session->u.cipher.para.op = cpu_to_le32(op);

The new style shows more obviously:
- the variable we want to operate.
- an assignment statement in a single line.

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
 .../virtio/virtio_crypto_akcipher_algs.c      | 40 ++++++-----
 .../virtio/virtio_crypto_skcipher_algs.c      | 72 +++++++++----------
 2 files changed, 59 insertions(+), 53 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index f3ec9420215e..20901a263fc8 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -106,23 +106,27 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	unsigned int inlen;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_session_input *input;
 
 	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);
+	ctrl = &vcrypto->ctrl;
+	memcpy(&ctrl->header, header, sizeof(ctrl->header));
+	memcpy(&ctrl->u, para, sizeof(ctrl->u));
+	input = &vcrypto->input;
+	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 
-	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr_sg, ctrl, sizeof(*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));
+	sg_init_one(&inhdr_sg, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
@@ -134,12 +138,12 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
+	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 		err = -EINVAL;
 		goto out;
 	}
 
-	ctx->session_id = le64_to_cpu(vcrypto->input.session_id);
+	ctx->session_id = le64_to_cpu(input->session_id);
 	ctx->session_valid = true;
 	err = 0;
 
@@ -149,7 +153,7 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 
 	if (err < 0)
 		pr_err("virtio_crypto: Create session failed status: %u\n",
-			le32_to_cpu(vcrypto->input.status));
+			le32_to_cpu(input->status));
 
 	return err;
 }
@@ -161,23 +165,27 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
 	unsigned int num_out = 0, num_in = 0, inlen;
 	int err;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_inhdr *ctrl_status;
 
 	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;
+	ctrl_status = &vcrypto->ctrl_status;
+	ctrl_status->status = VIRTIO_CRYPTO_ERR;
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
+	ctrl->header.queue_id = 0;
 
-	destroy_session = &vcrypto->ctrl.u.destroy_session;
+	destroy_session = &ctrl->u.destroy_session;
 	destroy_session->session_id = cpu_to_le64(ctx->session_id);
 
-	sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr_sg;
 
-	sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status,
sizeof(vcrypto->ctrl_status.status));
+	sg_init_one(&inhdr_sg, &ctrl_status->status,
sizeof(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);
@@ -189,7 +197,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
+	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 		err = -EINVAL;
 		goto out;
 	}
@@ -201,7 +209,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	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);
+			ctrl_status->status, destroy_session->session_id);
 	}
 
 	return err;
diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index a618c46a52b8..e3c5bc8d6112 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -123,6 +123,9 @@ static int virtio_crypto_alg_skcipher_init_session(
 	int op = encrypt ? VIRTIO_CRYPTO_OP_ENCRYPT : VIRTIO_CRYPTO_OP_DECRYPT;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_session_input *input;
+	struct virtio_crypto_sym_create_session_req *sym_create_session;
 
 	/*
 	 * Avoid to do DMA from the stack, switch to using
@@ -135,24 +138,22 @@ static int virtio_crypto_alg_skcipher_init_session(
 
 	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);
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
+	ctrl->header.algo = cpu_to_le32(alg);
 	/* Set the default dataqueue id to 0 */
-	vcrypto->ctrl.header.queue_id = 0;
+	ctrl->header.queue_id = 0;
 
-	vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
+	input = &vcrypto->input;
+	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));
+	sym_create_session = &ctrl->u.sym_create_session;
+	sym_create_session->op_type = cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
+	sym_create_session->u.cipher.para.algo = ctrl->header.algo;
+	sym_create_session->u.cipher.para.keylen = cpu_to_le32(keylen);
+	sym_create_session->u.cipher.para.op = cpu_to_le32(op);
+
+	sg_init_one(&outhdr, ctrl, sizeof(*ctrl));
 	sgs[num_out++] = &outhdr;
 
 	/* Set key */
@@ -160,7 +161,7 @@ static int virtio_crypto_alg_skcipher_init_session(
 	sgs[num_out++] = &key_sg;
 
 	/* Return status and session id back */
-	sg_init_one(&inhdr, &vcrypto->input, sizeof(vcrypto->input));
+	sg_init_one(&inhdr, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
@@ -180,20 +181,18 @@ static int virtio_crypto_alg_skcipher_init_session(
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
+	if (le32_to_cpu(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));
+			le32_to_cpu(input->status));
 		kfree_sensitive(cipher_key);
 		return -EINVAL;
 	}
 
 	if (encrypt)
-		ctx->enc_sess_info.session_id -		
le64_to_cpu(vcrypto->input.session_id);
+		ctx->enc_sess_info.session_id = le64_to_cpu(input->session_id);
 	else
-		ctx->dec_sess_info.session_id -		
le64_to_cpu(vcrypto->input.session_id);
+		ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
 
 	spin_unlock(&vcrypto->ctrl_lock);
 
@@ -211,30 +210,30 @@ static int virtio_crypto_alg_skcipher_close_session(
 	struct virtio_crypto *vcrypto = ctx->vcrypto;
 	int err;
 	unsigned int num_out = 0, num_in = 0;
+	struct virtio_crypto_op_ctrl_req *ctrl;
+	struct virtio_crypto_inhdr *ctrl_status;
 
 	spin_lock(&vcrypto->ctrl_lock);
-	vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
+	ctrl_status = &vcrypto->ctrl_status;
+	ctrl_status->status = VIRTIO_CRYPTO_ERR;
 	/* Pad ctrl header */
-	vcrypto->ctrl.header.opcode -	
cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
+	ctrl = &vcrypto->ctrl;
+	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
 	/* Set the default virtqueue id to 0 */
-	vcrypto->ctrl.header.queue_id = 0;
+	ctrl->header.queue_id = 0;
 
-	destroy_session = &vcrypto->ctrl.u.destroy_session;
+	destroy_session = &ctrl->u.destroy_session;
 
 	if (encrypt)
-		destroy_session->session_id -		
cpu_to_le64(ctx->enc_sess_info.session_id);
+		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);
+		destroy_session->session_id =
cpu_to_le64(ctx->dec_sess_info.session_id);
 
-	sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+	sg_init_one(&outhdr, ctrl, sizeof(*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));
+	sg_init_one(&status_sg, &ctrl_status->status,
sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &status_sg;
 
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
@@ -249,11 +248,10 @@ static int virtio_crypto_alg_skcipher_close_session(
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
 
-	if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
+	if (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);
+			ctrl_status->status, destroy_session->session_id);
 
 		return -EINVAL;
 	}
-- 
2.20.1

zhenwei pi

2022-May-05 09:24 UTC

head link

[PATCH v5 2/5] virtio-crypto: use private buffer for control request

Originally, all of the control requests share a single buffer(
ctrl & input & ctrl_status fields in struct virtio_crypto), this
allows queue depth 1 only, the performance of control queue gets
limited by this design.

In this patch, each request allocates request buffer dynamically, and
free buffer after request, so the scope protected by ctrl_lock also
get optimized here.
It's possible to optimize control queue depth in the next step.

A necessary comment is already in code, still describe it again:
/*
 * Note: there are padding fields in request, clear them to zero before
 * sending to host to avoid to divulge any information.
 * Ex, virtio_crypto_ctrl_request::ctrl::u::destroy_session::padding[48]
 */
So use kzalloc to allocate buffer of struct virtio_crypto_ctrl_request.

Potentially dereferencing uninitialized variables:
Reported-by: kernel test robot <lkp at intel.com>
Reported-by: Dan Carpenter <dan.carpenter at oracle.com>

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
 .../virtio/virtio_crypto_akcipher_algs.c      | 57 ++++++++++++-------
 drivers/crypto/virtio/virtio_crypto_common.h  | 17 ++++--
 .../virtio/virtio_crypto_skcipher_algs.c      | 50 ++++++++++------
 3 files changed, 79 insertions(+), 45 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 20901a263fc8..698ea57e2649 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -108,16 +108,22 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	unsigned int num_out = 0, num_in = 0;
 	struct virtio_crypto_op_ctrl_req *ctrl;
 	struct virtio_crypto_session_input *input;
+	struct virtio_crypto_ctrl_request *vc_ctrl_req;
 
 	pkey = kmemdup(key, keylen, GFP_ATOMIC);
 	if (!pkey)
 		return -ENOMEM;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	ctrl = &vcrypto->ctrl;
+	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+	if (!vc_ctrl_req) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	ctrl = &vc_ctrl_req->ctrl;
 	memcpy(&ctrl->header, header, sizeof(ctrl->header));
 	memcpy(&ctrl->u, para, sizeof(ctrl->u));
-	input = &vcrypto->input;
+	input = &vc_ctrl_req->input;
 	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 
 	sg_init_one(&outhdr_sg, ctrl, sizeof(*ctrl));
@@ -129,16 +135,22 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	sg_init_one(&inhdr_sg, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
+	spin_lock(&vcrypto->ctrl_lock);
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
-	if (err < 0)
+	if (err < 0) {
+		spin_unlock(&vcrypto->ctrl_lock);
 		goto out;
+	}
 
 	virtqueue_kick(vcrypto->ctrl_vq);
 	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
+	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
+		pr_err("virtio_crypto: Create session failed status: %u\n",
+			le32_to_cpu(input->status));
 		err = -EINVAL;
 		goto out;
 	}
@@ -148,13 +160,9 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	err = 0;
 
 out:
-	spin_unlock(&vcrypto->ctrl_lock);
+	kfree(vc_ctrl_req);
 	kfree_sensitive(pkey);
 
-	if (err < 0)
-		pr_err("virtio_crypto: Create session failed status: %u\n",
-			le32_to_cpu(input->status));
-
 	return err;
 }
 
@@ -167,15 +175,18 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	int err;
 	struct virtio_crypto_op_ctrl_req *ctrl;
 	struct virtio_crypto_inhdr *ctrl_status;
+	struct virtio_crypto_ctrl_request *vc_ctrl_req;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	if (!ctx->session_valid) {
-		err = 0;
-		goto out;
-	}
-	ctrl_status = &vcrypto->ctrl_status;
+	if (!ctx->session_valid)
+		return 0;
+
+	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+	if (!vc_ctrl_req)
+		return -ENOMEM;
+
+	ctrl_status = &vc_ctrl_req->ctrl_status;
 	ctrl_status->status = VIRTIO_CRYPTO_ERR;
-	ctrl = &vcrypto->ctrl;
+	ctrl = &vc_ctrl_req->ctrl;
 	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
 	ctrl->header.queue_id = 0;
 
@@ -188,16 +199,22 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	sg_init_one(&inhdr_sg, &ctrl_status->status,
sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
+	spin_lock(&vcrypto->ctrl_lock);
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
-	if (err < 0)
+	if (err < 0) {
+		spin_unlock(&vcrypto->ctrl_lock);
 		goto out;
+	}
 
 	virtqueue_kick(vcrypto->ctrl_vq);
 	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &inlen) &&
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
+	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
+		pr_err("virtio_crypto: Close session failed status: %u, session_id:
0x%llx\n",
+			ctrl_status->status, destroy_session->session_id);
 		err = -EINVAL;
 		goto out;
 	}
@@ -206,11 +223,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	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",
-			ctrl_status->status, destroy_session->session_id);
-	}
+	kfree(vc_ctrl_req);
 
 	return err;
 }
diff --git a/drivers/crypto/virtio/virtio_crypto_common.h
b/drivers/crypto/virtio/virtio_crypto_common.h
index e693d4ee83a6..2422237ec4e6 100644
--- a/drivers/crypto/virtio/virtio_crypto_common.h
+++ b/drivers/crypto/virtio/virtio_crypto_common.h
@@ -13,6 +13,7 @@
 #include <crypto/aead.h>
 #include <crypto/aes.h>
 #include <crypto/engine.h>
+#include <uapi/linux/virtio_crypto.h>
 
 
 /* Internal representation of a data virtqueue */
@@ -65,11 +66,6 @@ struct virtio_crypto {
 	/* 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;
@@ -85,6 +81,17 @@ struct virtio_crypto_sym_session_info {
 	__u64 session_id;
 };
 
+/*
+ * Note: there are padding fields in request, clear them to zero before
+ *       sending to host to avoid to divulge any information.
+ * Ex, virtio_crypto_ctrl_request::ctrl::u::destroy_session::padding[48]
+ */
+struct virtio_crypto_ctrl_request {
+	struct virtio_crypto_op_ctrl_req ctrl;
+	struct virtio_crypto_session_input input;
+	struct virtio_crypto_inhdr ctrl_status;
+};
+
 struct virtio_crypto_request;
 typedef void (*virtio_crypto_data_callback)
 		(struct virtio_crypto_request *vc_req, int len);
diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index e3c5bc8d6112..6aaf0869b211 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -126,6 +126,7 @@ static int virtio_crypto_alg_skcipher_init_session(
 	struct virtio_crypto_op_ctrl_req *ctrl;
 	struct virtio_crypto_session_input *input;
 	struct virtio_crypto_sym_create_session_req *sym_create_session;
+	struct virtio_crypto_ctrl_request *vc_ctrl_req;
 
 	/*
 	 * Avoid to do DMA from the stack, switch to using
@@ -136,15 +137,20 @@ static int virtio_crypto_alg_skcipher_init_session(
 	if (!cipher_key)
 		return -ENOMEM;
 
-	spin_lock(&vcrypto->ctrl_lock);
+	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+	if (!vc_ctrl_req) {
+		err = -ENOMEM;
+		goto out;
+	}
+
 	/* Pad ctrl header */
-	ctrl = &vcrypto->ctrl;
+	ctrl = &vc_ctrl_req->ctrl;
 	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
 	ctrl->header.algo = cpu_to_le32(alg);
 	/* Set the default dataqueue id to 0 */
 	ctrl->header.queue_id = 0;
 
-	input = &vcrypto->input;
+	input = &vc_ctrl_req->input;
 	input->status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
 	/* Pad cipher's parameters */
 	sym_create_session = &ctrl->u.sym_create_session;
@@ -164,12 +170,12 @@ static int virtio_crypto_alg_skcipher_init_session(
 	sg_init_one(&inhdr, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr;
 
+	spin_lock(&vcrypto->ctrl_lock);
 	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
 				num_in, vcrypto, GFP_ATOMIC);
 	if (err < 0) {
 		spin_unlock(&vcrypto->ctrl_lock);
-		kfree_sensitive(cipher_key);
-		return err;
+		goto out;
 	}
 	virtqueue_kick(vcrypto->ctrl_vq);
 
@@ -180,13 +186,13 @@ static int virtio_crypto_alg_skcipher_init_session(
 	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
+	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
-		spin_unlock(&vcrypto->ctrl_lock);
 		pr_err("virtio_crypto: Create session failed status: %u\n",
 			le32_to_cpu(input->status));
-		kfree_sensitive(cipher_key);
-		return -EINVAL;
+		err = -EINVAL;
+		goto out;
 	}
 
 	if (encrypt)
@@ -194,10 +200,11 @@ static int virtio_crypto_alg_skcipher_init_session(
 	else
 		ctx->dec_sess_info.session_id = le64_to_cpu(input->session_id);
 
-	spin_unlock(&vcrypto->ctrl_lock);
-
+	err = 0;
+out:
+	kfree(vc_ctrl_req);
 	kfree_sensitive(cipher_key);
-	return 0;
+	return err;
 }
 
 static int virtio_crypto_alg_skcipher_close_session(
@@ -212,12 +219,16 @@ static int virtio_crypto_alg_skcipher_close_session(
 	unsigned int num_out = 0, num_in = 0;
 	struct virtio_crypto_op_ctrl_req *ctrl;
 	struct virtio_crypto_inhdr *ctrl_status;
+	struct virtio_crypto_ctrl_request *vc_ctrl_req;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	ctrl_status = &vcrypto->ctrl_status;
+	vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+	if (!vc_ctrl_req)
+		return -ENOMEM;
+
+	ctrl_status = &vc_ctrl_req->ctrl_status;
 	ctrl_status->status = VIRTIO_CRYPTO_ERR;
 	/* Pad ctrl header */
-	ctrl = &vcrypto->ctrl;
+	ctrl = &vc_ctrl_req->ctrl;
 	ctrl->header.opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
 	/* Set the default virtqueue id to 0 */
 	ctrl->header.queue_id = 0;
@@ -236,28 +247,31 @@ static int virtio_crypto_alg_skcipher_close_session(
 	sg_init_one(&status_sg, &ctrl_status->status,
sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &status_sg;
 
+	spin_lock(&vcrypto->ctrl_lock);
 	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;
+		goto out;
 	}
 	virtqueue_kick(vcrypto->ctrl_vq);
 
 	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
 	       !virtqueue_is_broken(vcrypto->ctrl_vq))
 		cpu_relax();
+	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (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",
 			ctrl_status->status, destroy_session->session_id);
 
 		return -EINVAL;
 	}
-	spin_unlock(&vcrypto->ctrl_lock);
 
-	return 0;
+	err = 0;
+out:
+	kfree(vc_ctrl_req);
+	return err;
 }
 
 static int virtio_crypto_alg_skcipher_init_sessions(
-- 
2.20.1

zhenwei pi

2022-May-05 09:24 UTC

head link

[PATCH v5 3/5] virtio-crypto: wait ctrl queue instead of busy polling

Originally, after submitting request into virtio crypto control
queue, the guest side polls the result from the virt queue. This
works like following:
    CPU0   CPU1               ...             CPUx  CPUy
     |      |                                  |     |
     \      \                                  /     /
      \--------spin_lock(&vcrypto->ctrl_lock)-------/
                           |
                 virtqueue add & kick
                           |
                  busy poll virtqueue
                           |
              spin_unlock(&vcrypto->ctrl_lock)
                          ...

There are two problems:
1, The queue depth is always 1, the performance of a virtio crypto
   device gets limited. Multi user processes share a single control
   queue, and hit spin lock race from control queue. Test on Intel
   Platinum 8260, a single worker gets ~35K/s create/close session
   operations, and 8 workers get ~40K/s operations with 800% CPU
   utilization.
2, The control request is supposed to get handled immediately, but
   in the current implementation of QEMU(v6.2), the vCPU thread kicks
   another thread to do this work, the latency also gets unstable.
   Tracking latency of virtio_crypto_alg_akcipher_close_session in 5s:
        usecs               : count     distribution
         0 -> 1          : 0        |                        |
         2 -> 3          : 7        |                        |
         4 -> 7          : 72       |                        |
         8 -> 15         : 186485   |************************|
        16 -> 31         : 687      |                        |
        32 -> 63         : 5        |                        |
        64 -> 127        : 3        |                        |
       128 -> 255        : 1        |                        |
       256 -> 511        : 0        |                        |
       512 -> 1023       : 0        |                        |
      1024 -> 2047       : 0        |                        |
      2048 -> 4095       : 0        |                        |
      4096 -> 8191       : 0        |                        |
      8192 -> 16383      : 2        |                        |
This means that a CPU may hold vcrypto->ctrl_lock as long as 8192~16383us.

To improve the performance of control queue, a request on control queue
waits completion instead of busy polling to reduce lock racing, and gets
completed by control queue callback.
    CPU0   CPU1               ...             CPUx  CPUy
     |      |                                  |     |
     \      \                                  /     /
      \--------spin_lock(&vcrypto->ctrl_lock)-------/
                           |
                 virtqueue add & kick
                           |
      ---------spin_unlock(&vcrypto->ctrl_lock)------
     /      /                                  \     \
     |      |                                  |     |
    wait   wait                               wait  wait

Test this patch, the guest side get ~200K/s operations with 300% CPU
utilization.

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
 .../virtio/virtio_crypto_akcipher_algs.c      | 29 ++---------
 drivers/crypto/virtio/virtio_crypto_common.h  |  4 ++
 drivers/crypto/virtio/virtio_crypto_core.c    | 52 ++++++++++++++++++-
 .../virtio/virtio_crypto_skcipher_algs.c      | 34 ++----------
 4 files changed, 64 insertions(+), 55 deletions(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 698ea57e2649..382ccec9ab12 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -103,7 +103,6 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	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;
 	struct virtio_crypto_op_ctrl_req *ctrl;
@@ -135,18 +134,9 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
 	sg_init_one(&inhdr_sg, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
-	if (err < 0) {
-		spin_unlock(&vcrypto->ctrl_lock);
+	err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+	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();
-	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 		pr_err("virtio_crypto: Create session failed status: %u\n",
@@ -171,7 +161,7 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	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;
+	unsigned int num_out = 0, num_in = 0;
 	int err;
 	struct virtio_crypto_op_ctrl_req *ctrl;
 	struct virtio_crypto_inhdr *ctrl_status;
@@ -199,18 +189,9 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
 	sg_init_one(&inhdr_sg, &ctrl_status->status,
sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &inhdr_sg;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
-	if (err < 0) {
-		spin_unlock(&vcrypto->ctrl_lock);
+	err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+	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();
-	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 		pr_err("virtio_crypto: Close session failed status: %u, session_id:
0x%llx\n",
diff --git a/drivers/crypto/virtio/virtio_crypto_common.h
b/drivers/crypto/virtio/virtio_crypto_common.h
index 2422237ec4e6..59a4c0259456 100644
--- a/drivers/crypto/virtio/virtio_crypto_common.h
+++ b/drivers/crypto/virtio/virtio_crypto_common.h
@@ -90,6 +90,7 @@ struct virtio_crypto_ctrl_request {
 	struct virtio_crypto_op_ctrl_req ctrl;
 	struct virtio_crypto_session_input input;
 	struct virtio_crypto_inhdr ctrl_status;
+	struct completion compl;
 };
 
 struct virtio_crypto_request;
@@ -141,5 +142,8 @@ int virtio_crypto_skcipher_algs_register(struct
virtio_crypto *vcrypto);
 void virtio_crypto_skcipher_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);
+int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct
scatterlist *sgs[],
+				  unsigned int out_sgs, unsigned int in_sgs,
+				  struct virtio_crypto_ctrl_request *vc_ctrl_req);
 
 #endif /* _VIRTIO_CRYPTO_COMMON_H */
diff --git a/drivers/crypto/virtio/virtio_crypto_core.c
b/drivers/crypto/virtio/virtio_crypto_core.c
index c6f482db0bc0..60490ffa3df1 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -22,6 +22,56 @@ virtcrypto_clear_request(struct virtio_crypto_request
*vc_req)
 	}
 }
 
+static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request
*vc_ctrl_req)
+{
+	complete(&vc_ctrl_req->compl);
+}
+
+static void virtcrypto_ctrlq_callback(struct virtqueue *vq)
+{
+	struct virtio_crypto *vcrypto = vq->vdev->priv;
+	struct virtio_crypto_ctrl_request *vc_ctrl_req;
+	unsigned long flags;
+	unsigned int len;
+
+	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+	do {
+		virtqueue_disable_cb(vq);
+		while ((vc_ctrl_req = virtqueue_get_buf(vq, &len)) != NULL) {
+			spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+			virtio_crypto_ctrlq_callback(vc_ctrl_req);
+			spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+		}
+		if (unlikely(virtqueue_is_broken(vq)))
+			break;
+	} while (!virtqueue_enable_cb(vq));
+	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+}
+
+int virtio_crypto_ctrl_vq_request(struct virtio_crypto *vcrypto, struct
scatterlist *sgs[],
+		unsigned int out_sgs, unsigned int in_sgs,
+		struct virtio_crypto_ctrl_request *vc_ctrl_req)
+{
+	int err;
+	unsigned long flags;
+
+	init_completion(&vc_ctrl_req->compl);
+
+	spin_lock_irqsave(&vcrypto->ctrl_lock, flags);
+	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, out_sgs, in_sgs,
vc_ctrl_req, GFP_ATOMIC);
+	if (err < 0) {
+		spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+		return err;
+	}
+
+	virtqueue_kick(vcrypto->ctrl_vq);
+	spin_unlock_irqrestore(&vcrypto->ctrl_lock, flags);
+
+	wait_for_completion(&vc_ctrl_req->compl);
+
+	return 0;
+}
+
 static void virtcrypto_dataq_callback(struct virtqueue *vq)
 {
 	struct virtio_crypto *vcrypto = vq->vdev->priv;
@@ -73,7 +123,7 @@ static int virtcrypto_find_vqs(struct virtio_crypto *vi)
 		goto err_names;
 
 	/* Parameters for control virtqueue */
-	callbacks[total_vqs - 1] = NULL;
+	callbacks[total_vqs - 1] = virtcrypto_ctrlq_callback;
 	names[total_vqs - 1] = "controlq";
 
 	/* Allocate/initialize parameters for data virtqueues */
diff --git a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
index 6aaf0869b211..e553ccadbcbc 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -118,7 +118,6 @@ static int virtio_crypto_alg_skcipher_init_session(
 		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;
@@ -170,23 +169,9 @@ static int virtio_crypto_alg_skcipher_init_session(
 	sg_init_one(&inhdr, input, sizeof(*input));
 	sgs[num_out + num_in++] = &inhdr;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
-				num_in, vcrypto, GFP_ATOMIC);
-	if (err < 0) {
-		spin_unlock(&vcrypto->ctrl_lock);
+	err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+	if (err < 0)
 		goto out;
-	}
-	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();
-	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (le32_to_cpu(input->status) != VIRTIO_CRYPTO_OK) {
 		pr_err("virtio_crypto: Create session failed status: %u\n",
@@ -212,7 +197,6 @@ static int virtio_crypto_alg_skcipher_close_session(
 		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;
@@ -247,19 +231,9 @@ static int virtio_crypto_alg_skcipher_close_session(
 	sg_init_one(&status_sg, &ctrl_status->status,
sizeof(ctrl_status->status));
 	sgs[num_out + num_in++] = &status_sg;
 
-	spin_lock(&vcrypto->ctrl_lock);
-	err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
-			num_in, vcrypto, GFP_ATOMIC);
-	if (err < 0) {
-		spin_unlock(&vcrypto->ctrl_lock);
+	err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+	if (err < 0)
 		goto out;
-	}
-	virtqueue_kick(vcrypto->ctrl_vq);
-
-	while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
-	       !virtqueue_is_broken(vcrypto->ctrl_vq))
-		cpu_relax();
-	spin_unlock(&vcrypto->ctrl_lock);
 
 	if (ctrl_status->status != VIRTIO_CRYPTO_OK) {
 		pr_err("virtio_crypto: Close session failed status: %u, session_id:
0x%llx\n",
-- 
2.20.1

zhenwei pi

2022-May-05 09:24 UTC

head link

[PATCH v5 4/5] virtio-crypto: adjust dst_len at ops callback

From: lei he <helei.sig11 at bytedance.com>

For some akcipher operations(eg, decryption of pkcs1pad(rsa)),
the length of returned result maybe less than akcipher_req->dst_len,
we need to recalculate the actual dst_len through the virt-queue
protocol.

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Signed-off-by: lei he <helei.sig11 at bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
 drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index 382ccec9ab12..2a60d0525cde 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -90,9 +90,12 @@ static void virtio_crypto_dataq_akcipher_callback(struct
virtio_crypto_request *
 	}
 
 	akcipher_req = vc_akcipher_req->akcipher_req;
-	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY)
+	if (vc_akcipher_req->opcode != VIRTIO_CRYPTO_AKCIPHER_VERIFY) {
+		/* actuall length maybe less than dst buffer */
+		akcipher_req->dst_len = len - sizeof(vc_req->status);
 		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);
 }
 
-- 
2.20.1

zhenwei pi

2022-May-05 09:24 UTC

head link

[PATCH v5 5/5] virtio-crypto: enable retry for virtio-crypto-dev

From: lei he <helei.sig11 at bytedance.com>

Enable retry for virtio-crypto-dev, so that crypto-engine
can process cipher-requests parallelly.

Cc: Michael S. Tsirkin <mst at redhat.com>
Cc: Jason Wang <jasowang at redhat.com>
Cc: Gonglei <arei.gonglei at huawei.com>
Signed-off-by: lei he <helei.sig11 at bytedance.com>
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
 drivers/crypto/virtio/virtio_crypto_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/virtio/virtio_crypto_core.c
b/drivers/crypto/virtio/virtio_crypto_core.c
index 60490ffa3df1..f67e0d4c1b0c 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -144,7 +144,8 @@ static int virtcrypto_find_vqs(struct virtio_crypto *vi)
 		spin_lock_init(&vi->data_vq[i].lock);
 		vi->data_vq[i].vq = vqs[i];
 		/* Initialize crypto engine */
-		vi->data_vq[i].engine = crypto_engine_alloc_init(dev, 1);
+		vi->data_vq[i].engine = crypto_engine_alloc_init_and_set(dev, true, NULL,
1,
+						virtqueue_get_vring_size(vqs[i]));
 		if (!vi->data_vq[i].engine) {
 			ret = -ENOMEM;
 			goto err_engine;
-- 
2.20.1

Linux Virtualization - May 2022 - [PATCH v5 4/5] virtio-crypto: adjust dst_len at ops callback

[PATCH v5 0/5] virtio-crypto: Improve performance

[PATCH v5 1/5] virtio-crypto: change code style

[PATCH v5 2/5] virtio-crypto: use private buffer for control request

[PATCH v5 3/5] virtio-crypto: wait ctrl queue instead of busy polling

[PATCH v5 4/5] virtio-crypto: adjust dst_len at ops callback

[PATCH v5 5/5] virtio-crypto: enable retry for virtio-crypto-dev