Re: [RFC PATCH 20/27] vhost: Return used buffers
flat view
From: Stefan Hajnoczi <hidden>
Date: 2020-12-08 08:51:16
Also in:
kvm, qemu-devel
On Fri, Nov 20, 2020 at 07:50:58PM +0100, Eugenio Pérez wrote:
quoted hunk
@@ -1028,6 +1061,7 @@ static int vhost_sw_live_migration_start(struct vhost_dev *dev) for (idx = 0; idx < dev->nvqs; ++idx) { struct vhost_virtqueue *vq = &dev->vqs[idx]; + unsigned num = virtio_queue_get_num(dev->vdev, idx); struct vhost_vring_addr addr = { .index = idx, };@@ -1044,6 +1078,12 @@ static int vhost_sw_live_migration_start(struct vhost_dev *dev) r = dev->vhost_ops->vhost_set_vring_addr(dev, &addr); assert(r == 0); + r = vhost_backend_update_device_iotlb(dev, addr.used_user_addr, + addr.used_user_addr, + sizeof(vring_used_elem_t) * num, + IOMMU_RW);
I don't remember seeing iotlb setup for the rest of the vring or guest memory. Maybe this should go into a single patch so it's easy to review the iova space layout.