[virtio-dev] [PATCH v9 11/12] virtio-crypto: using bh to handle dataq's requests

[Gonglei]

Make crypto operations are executed asynchronously,
so that other QEMU threads and monitor couldn't
be blocked at the virtqueue handling context.

Signed-off-by: Gonglei <arei.gong...@huawei.com>
---
 hw/virtio/virtio-crypto.c         | 55 +++++++++++++++++++++++++++++++++++++--
 include/hw/virtio/virtio-crypto.h |  8 +++++-
 2 files changed, 60 insertions(+), 3 deletions(-)

diff --git a/hw/virtio/virtio-crypto.c b/hw/virtio/virtio-crypto.c
index 7fe1128..47a25cd 100644
--- a/hw/virtio/virtio-crypto.c
+++ b/hw/virtio/virtio-crypto.c
@@ -667,6 +667,41 @@ static void virtio_crypto_handle_dataq(VirtIODevice *vdev, 
VirtQueue *vq)
     }
 }
 
+static void virtio_crypto_dataq_bh(void *opaque)
+{
+    VirtIOCryptoQueue *q = opaque;
+    VirtIOCrypto *vcrypto = q->vcrypto;
+    VirtIODevice *vdev = VIRTIO_DEVICE(vcrypto);
+
+    /* This happens when device was stopped but BH wasn't. */
+    if (!vdev->vm_running) {
+        return;
+    }
+
+    /* Just in case the driver is not ready on more */
+    if (unlikely(!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))) {
+        return;
+    }
+
+    virtio_crypto_handle_dataq(vdev, q->dataq);
+    virtio_queue_set_notification(q->dataq, 1);
+}
+
+static void
+virtio_crypto_handle_dataq_bh(VirtIODevice *vdev, VirtQueue *vq)
+{
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(vdev);
+    VirtIOCryptoQueue *q =
+         &vcrypto->vqs[virtio_crypto_vq2q(virtio_get_queue_index(vq))];
+
+    /* This happens when device was stopped but VCPU wasn't. */
+    if (!vdev->vm_running) {
+        return;
+    }
+    virtio_queue_set_notification(vq, 0);
+    qemu_bh_schedule(q->dataq_bh);
+}
+
 static uint64_t virtio_crypto_get_features(VirtIODevice *vdev,
                                            uint64_t features,
                                            Error **errp)
@@ -724,9 +759,13 @@ static void virtio_crypto_device_realize(DeviceState *dev, 
Error **errp)
 
     virtio_init(vdev, "virtio-crypto", VIRTIO_ID_CRYPTO, vcrypto->config_size);
     vcrypto->curr_queues = 1;
-
+    vcrypto->vqs = g_malloc0(sizeof(VirtIOCryptoQueue) * vcrypto->max_queues);
     for (i = 0; i < vcrypto->max_queues; i++) {
-        virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq);
+        vcrypto->vqs[i].dataq =
+                 virtio_add_queue(vdev, 1024, virtio_crypto_handle_dataq_bh);
+        vcrypto->vqs[i].dataq_bh =
+                 qemu_bh_new(virtio_crypto_dataq_bh, &vcrypto->vqs[i]);
+        vcrypto->vqs[i].vcrypto = vcrypto;
     }
 
     vcrypto->ctrl_vq = virtio_add_queue(vdev, 64, virtio_crypto_handle_ctrl);
@@ -742,6 +781,18 @@ static void virtio_crypto_device_realize(DeviceState *dev, 
Error **errp)
 static void virtio_crypto_device_unrealize(DeviceState *dev, Error **errp)
 {
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VirtIOCrypto *vcrypto = VIRTIO_CRYPTO(dev);
+    VirtIOCryptoQueue *q;
+    int i, max_queues;
+
+    max_queues = vcrypto->multiqueue ? vcrypto->max_queues : 1;
+    for (i = 0; i < max_queues; i++) {
+        virtio_del_queue(vdev, i);
+        q = &vcrypto->vqs[i];
+        qemu_bh_delete(q->dataq_bh);
+    }
+
+    g_free(vcrypto->vqs);
 
     virtio_cleanup(vdev);
 }
diff --git a/include/hw/virtio/virtio-crypto.h 
b/include/hw/virtio/virtio-crypto.h
index 2628056..e15d694 100644
--- a/include/hw/virtio/virtio-crypto.h
+++ b/include/hw/virtio/virtio-crypto.h
@@ -69,11 +69,17 @@ typedef struct VirtIOCryptoReq {
     } u;
 } VirtIOCryptoReq;
 
+typedef struct VirtIOCryptoQueue {
+    VirtQueue *dataq;
+    QEMUBH *dataq_bh;
+    struct VirtIOCrypto *vcrypto;
+} VirtIOCryptoQueue;
+
 typedef struct VirtIOCrypto {
     VirtIODevice parent_obj;
 
     VirtQueue *ctrl_vq;
-
+    VirtIOCryptoQueue *vqs;
     VirtIOCryptoConf conf;
     CryptoDevBackend *cryptodev;
 
-- 
1.8.3.1



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