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[Qemu-devel] [PATCH 2/3] vhost: drop legacy vring layout bits
From: |
Greg Kurz |
Subject: |
[Qemu-devel] [PATCH 2/3] vhost: drop legacy vring layout bits |
Date: |
Fri, 04 Nov 2016 09:39:22 +0100 |
User-agent: |
StGit/0.17.1-dirty |
The legacy vring layout is not used anymore. This patch simply removes it.
This also fixes a bug with virtio 1 devices when the vring descriptor table
is mapped at a higher address than the used vring because the following
function may return an insanely great value:
hwaddr virtio_queue_get_ring_size(VirtIODevice *vdev, int n)
{
return vdev->vq[n].vring.used - vdev->vq[n].vring.desc +
virtio_queue_get_used_size(vdev, n);
}
and the mapping fails.
Signed-off-by: Greg Kurz <address@hidden>
---
hw/virtio/vhost.c | 13 -------------
include/hw/virtio/vhost.h | 3 ---
2 files changed, 16 deletions(-)
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 10133f12ebba..9fa81c9b65cb 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -923,14 +923,6 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
goto fail_alloc_used;
}
- vq->ring_size = s = l = virtio_queue_get_ring_size(vdev, idx);
- vq->ring_phys = a = virtio_queue_get_ring_addr(vdev, idx);
- vq->ring = cpu_physical_memory_map(a, &l, 1);
- if (!vq->ring || l != s) {
- r = -ENOMEM;
- goto fail_alloc_ring;
- }
-
r = vhost_virtqueue_set_addr(dev, vq, vhost_vq_index, dev->log_enabled);
if (r < 0) {
r = -errno;
@@ -971,9 +963,6 @@ static int vhost_virtqueue_start(struct vhost_dev *dev,
fail_vector:
fail_kick:
fail_alloc:
- cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
- 0, 0);
-fail_alloc_ring:
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
0, 0);
fail_alloc_used:
@@ -1014,8 +1003,6 @@ static void vhost_virtqueue_stop(struct vhost_dev *dev,
vhost_vq_index);
}
- cpu_physical_memory_unmap(vq->ring, virtio_queue_get_ring_size(vdev, idx),
- 0, virtio_queue_get_ring_size(vdev, idx));
cpu_physical_memory_unmap(vq->used, virtio_queue_get_used_size(vdev, idx),
1, virtio_queue_get_used_size(vdev, idx));
cpu_physical_memory_unmap(vq->avail, virtio_queue_get_avail_size(vdev,
idx),
diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h
index 56b567f1997f..1fe5aadef5ce 100644
--- a/include/hw/virtio/vhost.h
+++ b/include/hw/virtio/vhost.h
@@ -20,9 +20,6 @@ struct vhost_virtqueue {
unsigned avail_size;
unsigned long long used_phys;
unsigned used_size;
- void *ring;
- unsigned long long ring_phys;
- unsigned ring_size;
EventNotifier masked_notifier;
};