zhenwei pi
2022-Apr-18 09:00 UTC
[PATCH v2 1/4] 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
allows all of the requests share a single request buffer in
struct virtio_crypto(ctrl&input&ctrl_status).
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, remove
ctrl&input&ctrl_status from
struct virtio_crypto, each request allocates request buffer dynamically, 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.
Signed-off-by: zhenwei pi <pizhenwei at bytedance.com>
---
drivers/crypto/virtio/Makefile | 1 +
.../virtio/virtio_crypto_akcipher_algs.c | 90 ++++++------
drivers/crypto/virtio/virtio_crypto_common.c | 61 ++++++++
drivers/crypto/virtio/virtio_crypto_common.h | 25 +++-
drivers/crypto/virtio/virtio_crypto_core.c | 2 +-
.../virtio/virtio_crypto_skcipher_algs.c | 133 ++++++++----------
6 files changed, 185 insertions(+), 127 deletions(-)
create mode 100644 drivers/crypto/virtio/virtio_crypto_common.c
diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile
index bfa6cbae342e..49c1fa80e465 100644
--- a/drivers/crypto/virtio/Makefile
+++ b/drivers/crypto/virtio/Makefile
@@ -3,5 +3,6 @@ obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio_crypto.o
virtio_crypto-objs := \
virtio_crypto_skcipher_algs.o \
virtio_crypto_akcipher_algs.o \
+ virtio_crypto_common.o \
virtio_crypto_mgr.o \
virtio_crypto_core.o
diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
index f3ec9420215e..9561bc2df62b 100644
--- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c
@@ -102,8 +102,8 @@ 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;
+ struct virtio_crypto_ctrl_request *vc_ctrl_req;
uint8_t *pkey;
- unsigned int inlen;
int err;
unsigned int num_out = 0, num_in = 0;
@@ -111,98 +111,91 @@ static int virtio_crypto_alg_akcipher_init_session(struct
virtio_crypto_akcipher
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);
+ vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+ if (!vc_ctrl_req) {
+ err = -ENOMEM;
+ goto out;
+ }
- sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+ memcpy(&vc_ctrl_req->ctrl.header, header,
sizeof(vc_ctrl_req->ctrl.header));
+ memcpy(&vc_ctrl_req->ctrl.u, para, sizeof(vc_ctrl_req->ctrl.u));
+ sg_init_one(&outhdr_sg, &vc_ctrl_req->ctrl,
sizeof(vc_ctrl_req->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));
+ vc_ctrl_req->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
+ sg_init_one(&inhdr_sg, &vc_ctrl_req->input,
sizeof(vc_ctrl_req->input));
sgs[num_out + num_in++] = &inhdr_sg;
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto,
GFP_ATOMIC);
+ 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();
-
- if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
+ if (le32_to_cpu(vc_ctrl_req->input.status) != VIRTIO_CRYPTO_OK) {
+ pr_err("virtio_crypto: Create session failed status: %u\n",
+ le32_to_cpu(vc_ctrl_req->input.status));
err = -EINVAL;
goto out;
}
- ctx->session_id = le64_to_cpu(vcrypto->input.session_id);
+ ctx->session_id = le64_to_cpu(vc_ctrl_req->input.session_id);
ctx->session_valid = true;
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(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_ctrl_request *vc_ctrl_req;
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;
- 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;
+ if (!ctx->session_valid)
+ return 0;
- destroy_session = &vcrypto->ctrl.u.destroy_session;
+ vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+ if (!vc_ctrl_req)
+ return -ENOMEM;
+
+ vc_ctrl_req->ctrl.header.opcode =
cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION);
+ vc_ctrl_req->ctrl.header.queue_id = 0;
+
+ destroy_session = &vc_ctrl_req->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, &vc_ctrl_req->ctrl,
sizeof(vc_ctrl_req->ctrl));
sgs[num_out++] = &outhdr_sg;
- sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status,
sizeof(vcrypto->ctrl_status.status));
+ vc_ctrl_req->ctrl_status.status = VIRTIO_CRYPTO_ERR;
+ sg_init_one(&inhdr_sg, &vc_ctrl_req->ctrl_status.status,
+ sizeof(vc_ctrl_req->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);
+ 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();
-
- if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
+ if (vc_ctrl_req->ctrl_status.status != VIRTIO_CRYPTO_OK) {
err = -EINVAL;
+ pr_err("virtio_crypto: Close session failed status: %u, session_id:
0x%llx\n",
+ vc_ctrl_req->ctrl_status.status, destroy_session->session_id);
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);
- }
+ kfree(vc_ctrl_req);
return err;
}
@@ -210,14 +203,11 @@ static int virtio_crypto_alg_akcipher_close_session(struct
virtio_crypto_akciphe
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;
@@ -228,7 +218,7 @@ static int __virtio_crypto_akcipher_do_req(struct
virtio_crypto_akcipher_request
sgs[num_out++] = &outhdr_sg;
/* src data */
- src_buf = kcalloc_node(src_len, 1, GFP_KERNEL, node);
+ src_buf = kcalloc(src_len, 1, GFP_KERNEL);
if (!src_buf)
goto err;
@@ -243,7 +233,7 @@ static int __virtio_crypto_akcipher_do_req(struct
virtio_crypto_akcipher_request
sgs[num_out++] = &srcdata_sg;
/* dst data */
- dst_buf = kcalloc_node(req->dst_len, 1, GFP_KERNEL, node);
+ dst_buf = kcalloc(req->dst_len, 1, GFP_KERNEL);
if (!dst_buf)
goto err;
diff --git a/drivers/crypto/virtio/virtio_crypto_common.c
b/drivers/crypto/virtio/virtio_crypto_common.c
new file mode 100644
index 000000000000..93df73c40dd3
--- /dev/null
+++ b/drivers/crypto/virtio/virtio_crypto_common.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/* Common functions and helpers
+ *
+ * Authors: zhenwei pi <pizhenwei at bytedance.com>
+ *
+ * Copyright 2022 Bytedance CO., LTD.
+ */
+
+#include "virtio_crypto_common.h"
+
+static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request
*vc_ctrl_req)
+{
+ complete(&vc_ctrl_req->compl);
+}
+
+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);
+ vc_ctrl_req->ctrl_cb = virtio_crypto_ctrlq_callback;
+
+ 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;
+}
+
+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);
+ if (vc_ctrl_req->ctrl_cb)
+ vc_ctrl_req->ctrl_cb(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);
+}
diff --git a/drivers/crypto/virtio/virtio_crypto_common.h
b/drivers/crypto/virtio/virtio_crypto_common.h
index e693d4ee83a6..b90ac0ce30d2 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 +81,20 @@ struct virtio_crypto_sym_session_info {
__u64 session_id;
};
+struct virtio_crypto_ctrl_request;
+typedef void (*virtio_crypto_ctrl_callback)
+ (struct virtio_crypto_ctrl_request *vc_ctrl_req);
+
+/* Note: there are padding fields in request, clear them to zero before sending
to host,
+ * 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;
+ virtio_crypto_ctrl_callback ctrl_cb;
+ struct completion compl;
+};
+
struct virtio_crypto_request;
typedef void (*virtio_crypto_data_callback)
(struct virtio_crypto_request *vc_req, int len);
@@ -135,4 +145,9 @@ 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);
+void virtcrypto_ctrlq_callback(struct virtqueue *vq);
+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..e668d4b1bc6a 100644
--- a/drivers/crypto/virtio/virtio_crypto_core.c
+++ b/drivers/crypto/virtio/virtio_crypto_core.c
@@ -73,7 +73,7 @@ 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 a618c46a52b8..fef355ff461c 100644
--- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c
@@ -118,11 +118,13 @@ 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;
unsigned int num_out = 0, num_in = 0;
+ struct virtio_crypto_ctrl_request *vc_ctrl_req;
+ struct virtio_crypto_ctrl_header *header;
+ struct virtio_crypto_sym_create_session_req *sym_create_session;
/*
* Avoid to do DMA from the stack, switch to using
@@ -133,26 +135,27 @@ 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 */
- vcrypto->ctrl.header.opcode -
cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
- vcrypto->ctrl.header.algo = cpu_to_le32(alg);
+ header = &vc_ctrl_req->ctrl.header;
+ header->opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION);
+ header->algo = cpu_to_le32(alg);
/* Set the default dataqueue id to 0 */
- vcrypto->ctrl.header.queue_id = 0;
+ header->queue_id = 0;
- vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
/* Pad cipher's parameters */
- vcrypto->ctrl.u.sym_create_session.op_type -
cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER);
- vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo -
vcrypto->ctrl.header.algo;
- vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen -
cpu_to_le32(keylen);
- vcrypto->ctrl.u.sym_create_session.u.cipher.para.op - cpu_to_le32(op);
-
- sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl));
+ sym_create_session = &vc_ctrl_req->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 = 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, &vc_ctrl_req->ctrl,
sizeof(vc_ctrl_req->ctrl));
sgs[num_out++] = &outhdr;
/* Set key */
@@ -160,45 +163,34 @@ 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));
+ vc_ctrl_req->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR);
+ sg_init_one(&inhdr, &vc_ctrl_req->input,
sizeof(vc_ctrl_req->input));
sgs[num_out + num_in++] = &inhdr;
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
- num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
- kfree_sensitive(cipher_key);
- return err;
- }
- virtqueue_kick(vcrypto->ctrl_vq);
-
- /*
- * Trapping into the hypervisor, so the request should be
- * handled immediately.
- */
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+ if (err < 0)
+ goto out;
- if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) {
- spin_unlock(&vcrypto->ctrl_lock);
+ if (le32_to_cpu(vc_ctrl_req->input.status) != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Create session failed status: %u\n",
- le32_to_cpu(vcrypto->input.status));
- kfree_sensitive(cipher_key);
- return -EINVAL;
+ le32_to_cpu(vc_ctrl_req->input.status));
+ err = -EINVAL;
+ goto out;
}
if (encrypt)
ctx->enc_sess_info.session_id -
le64_to_cpu(vcrypto->input.session_id);
+ le64_to_cpu(vc_ctrl_req->input.session_id);
else
ctx->dec_sess_info.session_id -
le64_to_cpu(vcrypto->input.session_id);
-
- spin_unlock(&vcrypto->ctrl_lock);
+ le64_to_cpu(vc_ctrl_req->input.session_id);
+ err = 0;
+out:
+ kfree(vc_ctrl_req);
kfree_sensitive(cipher_key);
- return 0;
+
+ return err;
}
static int virtio_crypto_alg_skcipher_close_session(
@@ -206,21 +198,24 @@ 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;
unsigned int num_out = 0, num_in = 0;
+ struct virtio_crypto_ctrl_request *vc_ctrl_req;
+ struct virtio_crypto_ctrl_header *header;
+
+ vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL);
+ if (!vc_ctrl_req)
+ return -ENOMEM;
- spin_lock(&vcrypto->ctrl_lock);
- vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR;
/* Pad ctrl header */
- vcrypto->ctrl.header.opcode -
cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
+ header = &vc_ctrl_req->ctrl.header;
+ header->opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION);
/* Set the default virtqueue id to 0 */
- vcrypto->ctrl.header.queue_id = 0;
+ header->queue_id = 0;
- destroy_session = &vcrypto->ctrl.u.destroy_session;
+ destroy_session = &vc_ctrl_req->ctrl.u.destroy_session;
if (encrypt)
destroy_session->session_id @@ -229,37 +224,33 @@ static int
virtio_crypto_alg_skcipher_close_session(
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, &vc_ctrl_req->ctrl,
sizeof(vc_ctrl_req->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));
+ vc_ctrl_req->ctrl_status.status = VIRTIO_CRYPTO_ERR;
+ sg_init_one(&status_sg, &vc_ctrl_req->ctrl_status.status,
+ sizeof(vc_ctrl_req->ctrl_status.status));
sgs[num_out + num_in++] = &status_sg;
- err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out,
- num_in, vcrypto, GFP_ATOMIC);
- if (err < 0) {
- spin_unlock(&vcrypto->ctrl_lock);
- return err;
- }
- virtqueue_kick(vcrypto->ctrl_vq);
-
- while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) &&
- !virtqueue_is_broken(vcrypto->ctrl_vq))
- cpu_relax();
+ err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in,
vc_ctrl_req);
+ if (err < 0)
+ goto out;
- if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) {
- spin_unlock(&vcrypto->ctrl_lock);
+ if (vc_ctrl_req->ctrl_status.status != VIRTIO_CRYPTO_OK) {
pr_err("virtio_crypto: Close session failed status: %u, session_id:
0x%llx\n",
- vcrypto->ctrl_status.status,
+ vc_ctrl_req->ctrl_status.status,
destroy_session->session_id);
- return -EINVAL;
+ err = -EINVAL;
+ goto out;
}
- 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
Jason Wang
2022-Apr-20 03:32 UTC
[PATCH v2 1/4] virtio-crypto: wait ctrl queue instead of busy polling
? 2022/4/18 17:00, zhenwei pi ??:> Originally, after submitting request into virtio crypto control > queue, the guest side polls the result from the virt queue. This > allows all of the requests share a single request buffer in > struct virtio_crypto(ctrl&input&ctrl_status). > 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, remove ctrl&input&ctrl_status from > struct virtio_crypto, each request allocates request buffer dynamically, waits > completion instead of busy polling to reduce lock racing, and gets completed by > control queue callback.If possible, I would like to split this patch into two: 1) using private buffer 2) remove the busy polling> 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.What's more, this could be part of the hardening since it help to reduce the possibility of DOS from the buggy device. I think we need to avoid busy polling for all ctrl virtqueues (e.g the one in the virtio-net). Thanks> > Signed-off-by: zhenwei pi <pizhenwei at bytedance.com> > --- > drivers/crypto/virtio/Makefile | 1 + > .../virtio/virtio_crypto_akcipher_algs.c | 90 ++++++------ > drivers/crypto/virtio/virtio_crypto_common.c | 61 ++++++++ > drivers/crypto/virtio/virtio_crypto_common.h | 25 +++- > drivers/crypto/virtio/virtio_crypto_core.c | 2 +- > .../virtio/virtio_crypto_skcipher_algs.c | 133 ++++++++---------- > 6 files changed, 185 insertions(+), 127 deletions(-) > create mode 100644 drivers/crypto/virtio/virtio_crypto_common.c > > diff --git a/drivers/crypto/virtio/Makefile b/drivers/crypto/virtio/Makefile > index bfa6cbae342e..49c1fa80e465 100644 > --- a/drivers/crypto/virtio/Makefile > +++ b/drivers/crypto/virtio/Makefile > @@ -3,5 +3,6 @@ obj-$(CONFIG_CRYPTO_DEV_VIRTIO) += virtio_crypto.o > virtio_crypto-objs := \ > virtio_crypto_skcipher_algs.o \ > virtio_crypto_akcipher_algs.o \ > + virtio_crypto_common.o \ > virtio_crypto_mgr.o \ > virtio_crypto_core.o > diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > index f3ec9420215e..9561bc2df62b 100644 > --- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > @@ -102,8 +102,8 @@ 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; > + struct virtio_crypto_ctrl_request *vc_ctrl_req; > uint8_t *pkey; > - unsigned int inlen; > int err; > unsigned int num_out = 0, num_in = 0; > > @@ -111,98 +111,91 @@ static int virtio_crypto_alg_akcipher_init_session(struct virtio_crypto_akcipher > 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); > + vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL); > + if (!vc_ctrl_req) { > + err = -ENOMEM; > + goto out; > + } > > - sg_init_one(&outhdr_sg, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); > + memcpy(&vc_ctrl_req->ctrl.header, header, sizeof(vc_ctrl_req->ctrl.header)); > + memcpy(&vc_ctrl_req->ctrl.u, para, sizeof(vc_ctrl_req->ctrl.u)); > + sg_init_one(&outhdr_sg, &vc_ctrl_req->ctrl, sizeof(vc_ctrl_req->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)); > + vc_ctrl_req->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR); > + sg_init_one(&inhdr_sg, &vc_ctrl_req->input, sizeof(vc_ctrl_req->input)); > sgs[num_out + num_in++] = &inhdr_sg; > > - err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, num_in, vcrypto, GFP_ATOMIC); > + 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(); > - > - if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) { > + if (le32_to_cpu(vc_ctrl_req->input.status) != VIRTIO_CRYPTO_OK) { > + pr_err("virtio_crypto: Create session failed status: %u\n", > + le32_to_cpu(vc_ctrl_req->input.status)); > err = -EINVAL; > goto out; > } > > - ctx->session_id = le64_to_cpu(vcrypto->input.session_id); > + ctx->session_id = le64_to_cpu(vc_ctrl_req->input.session_id); > ctx->session_valid = true; > 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(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_ctrl_request *vc_ctrl_req; > 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; > > - 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; > + if (!ctx->session_valid) > + return 0; > > - destroy_session = &vcrypto->ctrl.u.destroy_session; > + vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL); > + if (!vc_ctrl_req) > + return -ENOMEM; > + > + vc_ctrl_req->ctrl.header.opcode = cpu_to_le32(VIRTIO_CRYPTO_AKCIPHER_DESTROY_SESSION); > + vc_ctrl_req->ctrl.header.queue_id = 0; > + > + destroy_session = &vc_ctrl_req->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, &vc_ctrl_req->ctrl, sizeof(vc_ctrl_req->ctrl)); > sgs[num_out++] = &outhdr_sg; > > - sg_init_one(&inhdr_sg, &vcrypto->ctrl_status.status, sizeof(vcrypto->ctrl_status.status)); > + vc_ctrl_req->ctrl_status.status = VIRTIO_CRYPTO_ERR; > + sg_init_one(&inhdr_sg, &vc_ctrl_req->ctrl_status.status, > + sizeof(vc_ctrl_req->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); > + 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(); > - > - if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) { > + if (vc_ctrl_req->ctrl_status.status != VIRTIO_CRYPTO_OK) { > err = -EINVAL; > + pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n", > + vc_ctrl_req->ctrl_status.status, destroy_session->session_id); > 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); > - } > + kfree(vc_ctrl_req); > > return err; > } > @@ -210,14 +203,11 @@ static int virtio_crypto_alg_akcipher_close_session(struct virtio_crypto_akciphe > 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; > @@ -228,7 +218,7 @@ static int __virtio_crypto_akcipher_do_req(struct virtio_crypto_akcipher_request > sgs[num_out++] = &outhdr_sg; > > /* src data */ > - src_buf = kcalloc_node(src_len, 1, GFP_KERNEL, node); > + src_buf = kcalloc(src_len, 1, GFP_KERNEL); > if (!src_buf) > goto err; > > @@ -243,7 +233,7 @@ static int __virtio_crypto_akcipher_do_req(struct virtio_crypto_akcipher_request > sgs[num_out++] = &srcdata_sg; > > /* dst data */ > - dst_buf = kcalloc_node(req->dst_len, 1, GFP_KERNEL, node); > + dst_buf = kcalloc(req->dst_len, 1, GFP_KERNEL); > if (!dst_buf) > goto err; > > diff --git a/drivers/crypto/virtio/virtio_crypto_common.c b/drivers/crypto/virtio/virtio_crypto_common.c > new file mode 100644 > index 000000000000..93df73c40dd3 > --- /dev/null > +++ b/drivers/crypto/virtio/virtio_crypto_common.c > @@ -0,0 +1,61 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* Common functions and helpers > + * > + * Authors: zhenwei pi <pizhenwei at bytedance.com> > + * > + * Copyright 2022 Bytedance CO., LTD. > + */ > + > +#include "virtio_crypto_common.h" > + > +static void virtio_crypto_ctrlq_callback(struct virtio_crypto_ctrl_request *vc_ctrl_req) > +{ > + complete(&vc_ctrl_req->compl); > +} > + > +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); > + vc_ctrl_req->ctrl_cb = virtio_crypto_ctrlq_callback; > + > + 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; > +} > + > +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); > + if (vc_ctrl_req->ctrl_cb) > + vc_ctrl_req->ctrl_cb(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); > +} > diff --git a/drivers/crypto/virtio/virtio_crypto_common.h b/drivers/crypto/virtio/virtio_crypto_common.h > index e693d4ee83a6..b90ac0ce30d2 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 +81,20 @@ struct virtio_crypto_sym_session_info { > __u64 session_id; > }; > > +struct virtio_crypto_ctrl_request; > +typedef void (*virtio_crypto_ctrl_callback) > + (struct virtio_crypto_ctrl_request *vc_ctrl_req); > + > +/* Note: there are padding fields in request, clear them to zero before sending to host, > + * 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; > + virtio_crypto_ctrl_callback ctrl_cb; > + struct completion compl; > +}; > + > struct virtio_crypto_request; > typedef void (*virtio_crypto_data_callback) > (struct virtio_crypto_request *vc_req, int len); > @@ -135,4 +145,9 @@ 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); > > +void virtcrypto_ctrlq_callback(struct virtqueue *vq); > +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..e668d4b1bc6a 100644 > --- a/drivers/crypto/virtio/virtio_crypto_core.c > +++ b/drivers/crypto/virtio/virtio_crypto_core.c > @@ -73,7 +73,7 @@ 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 a618c46a52b8..fef355ff461c 100644 > --- a/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c > +++ b/drivers/crypto/virtio/virtio_crypto_skcipher_algs.c > @@ -118,11 +118,13 @@ 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; > unsigned int num_out = 0, num_in = 0; > + struct virtio_crypto_ctrl_request *vc_ctrl_req; > + struct virtio_crypto_ctrl_header *header; > + struct virtio_crypto_sym_create_session_req *sym_create_session; > > /* > * Avoid to do DMA from the stack, switch to using > @@ -133,26 +135,27 @@ 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 */ > - vcrypto->ctrl.header.opcode > - cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); > - vcrypto->ctrl.header.algo = cpu_to_le32(alg); > + header = &vc_ctrl_req->ctrl.header; > + header->opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_CREATE_SESSION); > + header->algo = cpu_to_le32(alg); > /* Set the default dataqueue id to 0 */ > - vcrypto->ctrl.header.queue_id = 0; > + header->queue_id = 0; > > - vcrypto->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR); > /* Pad cipher's parameters */ > - vcrypto->ctrl.u.sym_create_session.op_type > - cpu_to_le32(VIRTIO_CRYPTO_SYM_OP_CIPHER); > - vcrypto->ctrl.u.sym_create_session.u.cipher.para.algo > - vcrypto->ctrl.header.algo; > - vcrypto->ctrl.u.sym_create_session.u.cipher.para.keylen > - cpu_to_le32(keylen); > - vcrypto->ctrl.u.sym_create_session.u.cipher.para.op > - cpu_to_le32(op); > - > - sg_init_one(&outhdr, &vcrypto->ctrl, sizeof(vcrypto->ctrl)); > + sym_create_session = &vc_ctrl_req->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 = 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, &vc_ctrl_req->ctrl, sizeof(vc_ctrl_req->ctrl)); > sgs[num_out++] = &outhdr; > > /* Set key */ > @@ -160,45 +163,34 @@ 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)); > + vc_ctrl_req->input.status = cpu_to_le32(VIRTIO_CRYPTO_ERR); > + sg_init_one(&inhdr, &vc_ctrl_req->input, sizeof(vc_ctrl_req->input)); > sgs[num_out + num_in++] = &inhdr; > > - err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, > - num_in, vcrypto, GFP_ATOMIC); > - if (err < 0) { > - spin_unlock(&vcrypto->ctrl_lock); > - kfree_sensitive(cipher_key); > - return err; > - } > - virtqueue_kick(vcrypto->ctrl_vq); > - > - /* > - * Trapping into the hypervisor, so the request should be > - * handled immediately. > - */ > - while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) && > - !virtqueue_is_broken(vcrypto->ctrl_vq)) > - cpu_relax(); > + err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); > + if (err < 0) > + goto out; > > - if (le32_to_cpu(vcrypto->input.status) != VIRTIO_CRYPTO_OK) { > - spin_unlock(&vcrypto->ctrl_lock); > + if (le32_to_cpu(vc_ctrl_req->input.status) != VIRTIO_CRYPTO_OK) { > pr_err("virtio_crypto: Create session failed status: %u\n", > - le32_to_cpu(vcrypto->input.status)); > - kfree_sensitive(cipher_key); > - return -EINVAL; > + le32_to_cpu(vc_ctrl_req->input.status)); > + err = -EINVAL; > + goto out; > } > > if (encrypt) > ctx->enc_sess_info.session_id > - le64_to_cpu(vcrypto->input.session_id); > + le64_to_cpu(vc_ctrl_req->input.session_id); > else > ctx->dec_sess_info.session_id > - le64_to_cpu(vcrypto->input.session_id); > - > - spin_unlock(&vcrypto->ctrl_lock); > + le64_to_cpu(vc_ctrl_req->input.session_id); > > + err = 0; > +out: > + kfree(vc_ctrl_req); > kfree_sensitive(cipher_key); > - return 0; > + > + return err; > } > > static int virtio_crypto_alg_skcipher_close_session( > @@ -206,21 +198,24 @@ 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; > unsigned int num_out = 0, num_in = 0; > + struct virtio_crypto_ctrl_request *vc_ctrl_req; > + struct virtio_crypto_ctrl_header *header; > + > + vc_ctrl_req = kzalloc(sizeof(*vc_ctrl_req), GFP_KERNEL); > + if (!vc_ctrl_req) > + return -ENOMEM; > > - spin_lock(&vcrypto->ctrl_lock); > - vcrypto->ctrl_status.status = VIRTIO_CRYPTO_ERR; > /* Pad ctrl header */ > - vcrypto->ctrl.header.opcode > - cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); > + header = &vc_ctrl_req->ctrl.header; > + header->opcode = cpu_to_le32(VIRTIO_CRYPTO_CIPHER_DESTROY_SESSION); > /* Set the default virtqueue id to 0 */ > - vcrypto->ctrl.header.queue_id = 0; > + header->queue_id = 0; > > - destroy_session = &vcrypto->ctrl.u.destroy_session; > + destroy_session = &vc_ctrl_req->ctrl.u.destroy_session; > > if (encrypt) > destroy_session->session_id > @@ -229,37 +224,33 @@ static int virtio_crypto_alg_skcipher_close_session( > 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, &vc_ctrl_req->ctrl, sizeof(vc_ctrl_req->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)); > + vc_ctrl_req->ctrl_status.status = VIRTIO_CRYPTO_ERR; > + sg_init_one(&status_sg, &vc_ctrl_req->ctrl_status.status, > + sizeof(vc_ctrl_req->ctrl_status.status)); > sgs[num_out + num_in++] = &status_sg; > > - err = virtqueue_add_sgs(vcrypto->ctrl_vq, sgs, num_out, > - num_in, vcrypto, GFP_ATOMIC); > - if (err < 0) { > - spin_unlock(&vcrypto->ctrl_lock); > - return err; > - } > - virtqueue_kick(vcrypto->ctrl_vq); > - > - while (!virtqueue_get_buf(vcrypto->ctrl_vq, &tmp) && > - !virtqueue_is_broken(vcrypto->ctrl_vq)) > - cpu_relax(); > + err = virtio_crypto_ctrl_vq_request(vcrypto, sgs, num_out, num_in, vc_ctrl_req); > + if (err < 0) > + goto out; > > - if (vcrypto->ctrl_status.status != VIRTIO_CRYPTO_OK) { > - spin_unlock(&vcrypto->ctrl_lock); > + if (vc_ctrl_req->ctrl_status.status != VIRTIO_CRYPTO_OK) { > pr_err("virtio_crypto: Close session failed status: %u, session_id: 0x%llx\n", > - vcrypto->ctrl_status.status, > + vc_ctrl_req->ctrl_status.status, > destroy_session->session_id); > > - return -EINVAL; > + err = -EINVAL; > + goto out; > } > - spin_unlock(&vcrypto->ctrl_lock); > > - return 0; > + err = 0; > +out: > + kfree(vc_ctrl_req); > + > + return err; > } > > static int virtio_crypto_alg_skcipher_init_sessions(