[Qemu-devel] [PATCH v4 05/13] virtio-crypto: add virtio crypto device emulation

[Gonglei <arei.gonglei@huawei.com>]

Introduce the virtio crypto realization, I'll
finish the core code in the following patches. The
thoughts came from virtio net realization.

For more information see:
http://qemu-project.org/Features/VirtioCrypto

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
---
 hw/virtio/Makefile.objs                     |   1 +
 hw/virtio/virtio-crypto.c                   | 199 ++++++++++++++++++++++++++++
 include/hw/virtio/virtio-crypto.h           |  74 +++++++++++
 include/standard-headers/linux/virtio_ids.h |   2 +-
 4 files changed, 275 insertions(+), 1 deletion(-)
 create mode 100644 hw/virtio/virtio-crypto.c
 create mode 100644 include/hw/virtio/virtio-crypto.h

diff --git a/hw/virtio/Makefile.objs b/hw/virtio/Makefile.objs
index e716308..968f392 100644
--- a/hw/virtio/Makefile.objs
+++ b/hw/virtio/Makefile.objs
@@ -7,3 +7,4 @@ obj-y += virtio.o virtio-balloon.o
 obj-$(CONFIG_LINUX) += vhost.o vhost-backend.o vhost-user.o
 
 obj-$(CONFIG_VHOST_VSOCK) += vhost-vsock.o
+obj-y += virtio-crypto.o
diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
new file mode 100644
index 0000000..e639fb3
--- /dev/null
+++ b/hw/virtio/virtio-crypto.c
@@ -0,0 +1,199 @@
+/*
+ * Virtio crypto Support
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * Authors:
+ *    Gonglei <arei.gonglei@huawei.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qemu/iov.h"
+#include "hw/qdev.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-crypto.h"
+#include "hw/virtio/virtio-access.h"
+#include "standard-headers/linux/virtio_ids.h"
+
+
+static void virtio_crypto_process(VirtIOCrypto *vcrypto)
+{
+}
+
+static void virtio_crypto_handle_ctrl(VirtIODevice *vdev, VirtQueue *vq)
+{
+
+}
+
+static void virtio_crypto_handle_dataq(VirtIODevice *vdev, VirtQueue *vq)
+{
+
+}
+
+static uint64_t virtio_crypto_get_features(VirtIODevice *vdev,
+                                           uint64_t features,
+                                           Error **errp)
+{
+    return features;
+}
+
+static void virtio_crypto_set_features(VirtIODevice *vdev, uint64_t features)
+{
+
+}
+
+static void virtio_crypto_save(QEMUFile *f, void *opaque)
+{
+    VirtIODevice *vdev = opaque;
+
+    virtio_save(vdev, f);
+}
+
+static int virtio_crypto_load(QEMUFile *f, void *opaque, int version_id)
+{
+    VirtIOCrypto *vcrypto = opaque;
+    int ret;
+
+    if (version_id != 1) {
+        return -EINVAL;
+    }
+    ret = virtio_load(VIRTIO_DEVICE(vcrypto), f, version_id);
+    if (ret != 0) {
+        return ret;
+    }
+
+    /* We may have an element ready but couldn't process it due to a quota
+     * limit.  Make sure to try again after live migration when the quota may
+     * have been reset.
+     */
+    virtio_crypto_process(vcrypto);
+
+    return 0;
+}
+
+static void virtio_crypto_reset(VirtIODevice *vdev)
+{
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
+    /* multiqueue is disabled by default */
+    vcrypto->curr_queues = 1;
+    if (!vcrypto->cryptodev->ready) {
+        vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
+    } else {
+        vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
+    }
+}
+
+static void virtio_crypto_device_realize(DeviceState *dev, Error **errp)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
+    int i;
+
+    vcrypto->cryptodev = vcrypto->conf.cryptodev;
+    if (vcrypto->cryptodev == NULL) {
+        error_setg(errp, "'cryptodev' parameter expects a valid object");
+        return;
+    }
+
+    vcrypto->max_queues = MAX(vcrypto->cryptodev->conf.peers.queues, 1);
+    if (vcrypto->max_queues + 1 > VIRTIO_QUEUE_MAX) {
+        error_setg(errp, "Invalid number of queues (= %" PRIu16 "), "
+                   "must be a postive integer less than %d.",
+                   vcrypto->max_queues, VIRTIO_QUEUE_MAX - 1);
+        return;
+    }
+
+    virtio_init(vdev, "virtio-crypto", VIRTIO_ID_CRYPTO, vcrypto->config_size);
+    vcrypto->curr_queues = 1;
+
+    for (i = 0; i < vcrypto->max_queues; i++) {
+        virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq);
+    }
+
+    vcrypto->ctrl_vq = virtio_add_queue(vdev, 64, virtio_crypto_handle_ctrl);
+    if (!vcrypto->cryptodev->ready) {
+        vcrypto->status &= ~VIRTIO_CRYPTO_S_HW_READY;
+    } else {
+        vcrypto->status |= VIRTIO_CRYPTO_S_HW_READY;
+    }
+    register_savevm(dev, "virtio-crypto", -1, 1, virtio_crypto_save,
+                    virtio_crypto_load, vcrypto);
+}
+
+static void virtio_crypto_device_unrealize(DeviceState *dev, Error **errp)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
+
+    unregister_savevm(dev, "virtio-crypto", vcrypto);
+
+    virtio_cleanup(vdev);
+}
+
+static Property virtio_crypto_properties[] = {
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_crypto_get_config(VirtIODevice *vdev, uint8_t *config)
+{
+
+}
+
+static void virtio_crypto_set_config(VirtIODevice *vdev, const uint8_t *config)
+{
+
+}
+
+static void virtio_crypto_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+
+    dc->props = virtio_crypto_properties;
+    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+    vdc->realize = virtio_crypto_device_realize;
+    vdc->unrealize = virtio_crypto_device_unrealize;
+    vdc->get_config = virtio_crypto_get_config;
+    vdc->set_config = virtio_crypto_set_config;
+    vdc->get_features = virtio_crypto_get_features;
+    vdc->set_features = virtio_crypto_set_features;
+    vdc->reset = virtio_crypto_reset;
+}
+
+static void virtio_crypto_instance_init(Object *obj)
+{
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(obj);
+
+    /*
+     * The default config_size is sizeof(struct virtio_crypto_config).
+     * Can be overriden with virtio_crypto_set_config_size.
+     */
+    vcrypto->config_size = sizeof(struct virtio_crypto_config);
+
+    object_property_add_link(obj, "cryptodev",
+                             TYPE_QCRYPTO_CRYPTODEV_BACKEND,
+                             (Object **)&vcrypto->conf.cryptodev,
+                             qdev_prop_allow_set_link_before_realize,
+                             OBJ_PROP_LINK_UNREF_ON_RELEASE, NULL);
+}
+
+static const TypeInfo virtio_crypto_info = {
+    .name = TYPE_VIRTIO_CRYPTO,
+    .parent = TYPE_VIRTIO_DEVICE,
+    .instance_size = sizeof(VirtIOCrypto),
+    .instance_init = virtio_crypto_instance_init,
+    .class_init = virtio_crypto_class_init,
+};
+
+static void virtio_register_types(void)
+{
+    type_register_static(&virtio_crypto_info);
+}
+
+type_init(virtio_register_types)
diff --git a/include/hw/virtio/virtio-crypto.h b/include/hw/virtio/virtio-crypto.h
new file mode 100644
index 0000000..484062c
--- /dev/null
+++ b/include/hw/virtio/virtio-crypto.h
@@ -0,0 +1,74 @@
+/*
+ * Virtio crypto Support
+ *
+ * Copyright (c) 2016 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * Authors:
+ *    Gonglei <arei.gonglei@huawei.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+
+#ifndef _QEMU_VIRTIO_CRYPTO_H
+#define _QEMU_VIRTIO_CRYPTO_H
+
+#include "standard-headers/linux/virtio_crypto.h"
+#include "hw/virtio/virtio.h"
+#include "sysemu/iothread.h"
+#include "sysemu/cryptodev.h"
+
+
+/* #define DEBUG_VIRTIO_CRYPTO */
+
+#ifdef DEBUG_VIRTIO_CRYPTO
+#define DPRINTF(fmt, ...) \
+do { printf("virtio_crypto: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do { } while (0)
+#endif
+
+#define TYPE_VIRTIO_CRYPTO "virtio-crypto-device"
+#define VIRTIO_CRYPTO(obj) \
+        OBJECT_CHECK(VirtIOCrypto, (obj), TYPE_VIRTIO_CRYPTO)
+#define VIRTIO_CRYPTO_GET_PARENT_CLASS(obj) \
+        OBJECT_GET_PARENT_CLASS(obj, TYPE_VIRTIO_CRYPTO)
+
+
+typedef struct VirtIOCryptoConf {
+    QCryptoCryptoDevBackend *cryptodev;
+} VirtIOCryptoConf;
+
+struct VirtIOCrypto;
+
+typedef struct VirtIOCryptoReq {
+    VirtQueueElement elem;
+    /* flags of operation, such as type of algorithm */
+    uint32_t flags;
+    /* address of in data (Device to Driver) */
+    void *idata_hva;
+    VirtQueue *vq;
+    struct VirtIOCrypto *vcrypto;
+    union {
+        QCryptoCryptoDevBackendSymOpInfo *sym_op_info;
+    } u;
+} VirtIOCryptoReq;
+
+typedef struct VirtIOCrypto {
+    VirtIODevice parent_obj;
+
+    VirtQueue *ctrl_vq;
+
+    VirtIOCryptoConf conf;
+    QCryptoCryptoDevBackend *cryptodev;
+
+    uint32_t max_queues;
+    uint32_t status;
+
+    int multiqueue;
+    uint32_t curr_queues;
+    size_t config_size;
+} VirtIOCrypto;
+
+#endif /* _QEMU_VIRTIO_CRYPTO_H */
diff --git a/include/standard-headers/linux/virtio_ids.h b/include/standard-headers/linux/virtio_ids.h
index 3228d58..fe74e42 100644
--- a/include/standard-headers/linux/virtio_ids.h
+++ b/include/standard-headers/linux/virtio_ids.h
@@ -42,5 +42,5 @@
 #define VIRTIO_ID_GPU          16 /* virtio GPU */
 #define VIRTIO_ID_INPUT        18 /* virtio input */
 #define VIRTIO_ID_VSOCK        19 /* virtio vsock transport */
-
+#define VIRTIO_ID_CRYPTO       20 /* virtio crypto */
 #endif /* _LINUX_VIRTIO_IDS_H */
-- 
1.7.12.4