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Tsirkin" , Jason Wang , Juan Quintela , Markus Armbruster , virtualization@lists.linux-foundation.org, Harpreet Singh Anand , Xiao W Wang , Stefan Hajnoczi , Eli Cohen , Stefano Garzarella , Michael Lilja , Jim Harford , Rob Miller Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Eugenio Pérez --- hw/virtio/vhost-shadow-virtqueue.h | 2 ++ hw/virtio/vhost-shadow-virtqueue.c | 55 ++++++++++++++++++++++++++++++ hw/virtio/vhost.c | 5 ++- 3 files changed, 61 insertions(+), 1 deletion(-) diff --git a/hw/virtio/vhost-shadow-virtqueue.h b/hw/virtio/vhost-shadow-virtqueue.h index 466f8ae595..99a4e011fd 100644 --- a/hw/virtio/vhost-shadow-virtqueue.h +++ b/hw/virtio/vhost-shadow-virtqueue.h @@ -17,6 +17,8 @@ typedef struct VhostShadowVirtqueue VhostShadowVirtqueue; +EventNotifier *vhost_shadow_vq_get_call_notifier(VhostShadowVirtqueue *vq); + bool vhost_shadow_vq_start_rcu(struct vhost_dev *dev, VhostShadowVirtqueue *svq); void vhost_shadow_vq_stop_rcu(struct vhost_dev *dev, diff --git a/hw/virtio/vhost-shadow-virtqueue.c b/hw/virtio/vhost-shadow-virtqueue.c index 908c36c66d..e2e0bfe325 100644 --- a/hw/virtio/vhost-shadow-virtqueue.c +++ b/hw/virtio/vhost-shadow-virtqueue.c @@ -53,6 +53,34 @@ static void handle_shadow_vq(VirtIODevice *vdev, VirtQueue *vq) vhost_shadow_vring_kick(svq); } +static void vhost_handle_call(EventNotifier *n) +{ + VhostShadowVirtqueue *svq = container_of(n, VhostShadowVirtqueue, + call_notifier); + + if (event_notifier_test_and_clear(n)) { + unsigned idx = virtio_queue_get_idx(svq->vdev, svq->vq); + + /* + * Since QEMU has not add any descriptors, virtqueue code thinks its + * not needed to signal used. QEMU shadow virtqueue will take + * descriptor forwarding soon, so just invalidate used cache for now. + */ + virtio_queue_invalidate_signalled_used(svq->vdev, idx); + virtio_notify_irqfd(svq->vdev, svq->vq); + } +} + +/* + * Get the vhost call notifier of the shadow vq + * @vq Shadow virtqueue + */ +EventNotifier *vhost_shadow_vq_get_call_notifier(VhostShadowVirtqueue *vq) +{ + return &vq->call_notifier; +} + + /* * Start shadow virtqueue operation. * @dev vhost device @@ -70,6 +98,10 @@ bool vhost_shadow_vq_start_rcu(struct vhost_dev *dev, .index = idx, .fd = event_notifier_get_fd(&svq->kick_notifier), }; + struct vhost_vring_file call_file = { + .index = idx, + .fd = event_notifier_get_fd(&svq->call_notifier), + }; int r; bool ok; @@ -88,6 +120,12 @@ bool vhost_shadow_vq_start_rcu(struct vhost_dev *dev, goto err_set_vring_kick; } + r = dev->vhost_ops->vhost_set_vring_call(dev, &call_file); + if (r != 0) { + error_report("Couldn't set call fd: %s", strerror(errno)); + goto err_set_vring_call; + } + event_notifier_set_handler(vq_host_notifier, virtio_queue_host_notifier_read); virtio_queue_set_host_notifier_enabled(svq->vq, false); @@ -95,6 +133,11 @@ bool vhost_shadow_vq_start_rcu(struct vhost_dev *dev, return true; +err_set_vring_call: + kick_file.fd = event_notifier_get_fd(vq_host_notifier); + r = dev->vhost_ops->vhost_set_vring_kick(dev, &kick_file); + assert(r == 0); + err_set_vring_kick: k->set_vq_handler(dev->vdev, idx, NULL); @@ -129,6 +172,17 @@ void vhost_shadow_vq_stop_rcu(struct vhost_dev *dev, event_notifier_set_handler(vq_host_notifier, NULL); virtio_queue_set_host_notifier_enabled(svq->vq, true); k->set_vq_handler(svq->vdev, idx, NULL); + + if (!dev->vqs[idx].notifier_is_masked) { + EventNotifier *e = vhost_shadow_vq_get_call_notifier(svq); + + /* Restore vhost call */ + vhost_virtqueue_mask(dev, svq->vdev, idx, false); + if (event_notifier_test_and_clear(e)) { + virtio_queue_invalidate_signalled_used(svq->vdev, idx); + virtio_notify_irqfd(svq->vdev, svq->vq); + } + } } /* @@ -159,6 +213,7 @@ VhostShadowVirtqueue *vhost_shadow_vq_new(struct vhost_dev *dev, int idx) goto err_init_call_notifier; } + event_notifier_set_handler(&svq->call_notifier, vhost_handle_call); return g_steal_pointer(&svq); err_init_call_notifier: diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index bde688f278..5ad0990509 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -984,7 +984,6 @@ static int vhost_sw_live_migration_start(struct vhost_dev *dev) int stop_idx = idx; bool ok = vhost_shadow_vq_start_rcu(dev, dev->shadow_vqs[idx]); - if (!ok) { while (--stop_idx >= 0) { vhost_shadow_vq_stop_rcu(dev, dev->shadow_vqs[stop_idx]); @@ -1610,6 +1609,10 @@ void vhost_virtqueue_mask(struct vhost_dev *hdev, VirtIODevice *vdev, int n, if (mask) { assert(vdev->use_guest_notifier_mask); file.fd = event_notifier_get_fd(&hdev->vqs[index].masked_notifier); + } else if (hdev->sw_lm_enabled) { + VhostShadowVirtqueue *svq = hdev->shadow_vqs[n]; + EventNotifier *e = vhost_shadow_vq_get_call_notifier(svq); + file.fd = event_notifier_get_fd(e); } else { file.fd = event_notifier_get_fd(virtio_queue_get_guest_notifier(vvq)); } -- 2.27.0