5.10-stable review patch. If anyone has any objections, please let me know.
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From: zhenwei pi pizhenwei@bytedance.com
[ Upstream commit 977231e8d45657871a86fe3c7bed94921d04e447 ]
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@redhat.com Cc: Jason Wang jasowang@redhat.com Cc: Gonglei arei.gonglei@huawei.com Reviewed-by: Gonglei arei.gonglei@huawei.com Signed-off-by: zhenwei pi pizhenwei@bytedance.com Message-Id: 20220506131627.180784-4-pizhenwei@bytedance.com Signed-off-by: Michael S. Tsirkin mst@redhat.com Stable-dep-of: fed93fb62e05 ("crypto: virtio - Handle dataq logic with tasklet") Signed-off-by: Sasha Levin sashal@kernel.org --- .../virtio/virtio_crypto_akcipher_algs.c | 29 ++--------- drivers/crypto/virtio/virtio_crypto_algs.c | 34 ++---------- drivers/crypto/virtio/virtio_crypto_common.h | 4 ++ drivers/crypto/virtio/virtio_crypto_core.c | 52 ++++++++++++++++++- 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_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c index 50601398f35c..32c73e7d8243 100644 --- a/drivers/crypto/virtio/virtio_crypto_algs.c +++ b/drivers/crypto/virtio/virtio_crypto_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", diff --git a/drivers/crypto/virtio/virtio_crypto_common.h b/drivers/crypto/virtio/virtio_crypto_common.h index e9ecbda6affe..e0dcb247840a 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_algs_register(struct virtio_crypto *vcrypto); void virtio_crypto_algs_unregister(struct virtio_crypto *vcrypto); int virtio_crypto_akcipher_algs_register(struct virtio_crypto *vcrypto); void virtio_crypto_akcipher_algs_unregister(struct virtio_crypto *vcrypto); +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 f6eb6d064fbd..94624f469985 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 */