vhost: introduce vhost_vring_call
This commit introduces struct vhost_vring_call which replaced raw struct eventfd_ctx *call_ctx in struct vhost_virtqueue. Besides eventfd_ctx, it contains a spin lock and an irq_bypass_producer in its structure. Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> Suggested-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200731065533.4144-2-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Este commit está contenido en:

cometido por
Michael S. Tsirkin

padre
bf11d71a0a
commit
265a0ad873
@@ -298,6 +298,13 @@ static void vhost_vq_meta_reset(struct vhost_dev *d)
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__vhost_vq_meta_reset(d->vqs[i]);
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}
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static void vhost_vring_call_reset(struct vhost_vring_call *call_ctx)
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{
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call_ctx->ctx = NULL;
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memset(&call_ctx->producer, 0x0, sizeof(struct irq_bypass_producer));
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spin_lock_init(&call_ctx->ctx_lock);
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}
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static void vhost_vq_reset(struct vhost_dev *dev,
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struct vhost_virtqueue *vq)
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{
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@@ -319,13 +326,13 @@ static void vhost_vq_reset(struct vhost_dev *dev,
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vq->log_base = NULL;
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vq->error_ctx = NULL;
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vq->kick = NULL;
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vq->call_ctx = NULL;
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vq->log_ctx = NULL;
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vhost_reset_is_le(vq);
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vhost_disable_cross_endian(vq);
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vq->busyloop_timeout = 0;
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vq->umem = NULL;
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vq->iotlb = NULL;
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vhost_vring_call_reset(&vq->call_ctx);
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__vhost_vq_meta_reset(vq);
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}
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@@ -685,8 +692,8 @@ void vhost_dev_cleanup(struct vhost_dev *dev)
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eventfd_ctx_put(dev->vqs[i]->error_ctx);
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if (dev->vqs[i]->kick)
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fput(dev->vqs[i]->kick);
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if (dev->vqs[i]->call_ctx)
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eventfd_ctx_put(dev->vqs[i]->call_ctx);
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if (dev->vqs[i]->call_ctx.ctx)
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eventfd_ctx_put(dev->vqs[i]->call_ctx.ctx);
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vhost_vq_reset(dev, dev->vqs[i]);
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}
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vhost_dev_free_iovecs(dev);
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@@ -1629,7 +1636,10 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg
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r = PTR_ERR(ctx);
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break;
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}
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swap(ctx, vq->call_ctx);
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spin_lock(&vq->call_ctx.ctx_lock);
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swap(ctx, vq->call_ctx.ctx);
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spin_unlock(&vq->call_ctx.ctx_lock);
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break;
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case VHOST_SET_VRING_ERR:
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if (copy_from_user(&f, argp, sizeof f)) {
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@@ -2440,8 +2450,8 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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{
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/* Signal the Guest tell them we used something up. */
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if (vq->call_ctx && vhost_notify(dev, vq))
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eventfd_signal(vq->call_ctx, 1);
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if (vq->call_ctx.ctx && vhost_notify(dev, vq))
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eventfd_signal(vq->call_ctx.ctx, 1);
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}
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EXPORT_SYMBOL_GPL(vhost_signal);
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