linux-kernel - [PATCH v3 07/10] crypto: virtio: Add req_data with structure virtio_crypto_sym

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Message-Id: <20251209022258.4183415-8-maobibo@loongson.cn>
Date: Tue,  9 Dec 2025 10:22:55 +0800
From: Bibo Mao <maobibo@...ngson.cn>
To: Gonglei <arei.gonglei@...wei.com>,
	"Michael S . Tsirkin" <mst@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
	Eugenio Pérez <eperezma@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>
Cc: kvm@...r.kernel.org,
	linux-crypto@...r.kernel.org,
	virtualization@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 07/10] crypto: virtio: Add req_data with structure virtio_crypto_sym_request

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

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

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