vhost: virtio 1.0 endian-ness support
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin
parent
64f7f0510c
commit
3b1bbe8935
@ -33,8 +33,8 @@ enum {
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VHOST_MEMORY_F_LOG = 0x1,
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};
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#define vhost_used_event(vq) ((u16 __user *)&vq->avail->ring[vq->num])
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#define vhost_avail_event(vq) ((u16 __user *)&vq->used->ring[vq->num])
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#define vhost_used_event(vq) ((__virtio16 __user *)&vq->avail->ring[vq->num])
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#define vhost_avail_event(vq) ((__virtio16 __user *)&vq->used->ring[vq->num])
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static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh,
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poll_table *pt)
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@ -1001,7 +1001,7 @@ EXPORT_SYMBOL_GPL(vhost_log_write);
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static int vhost_update_used_flags(struct vhost_virtqueue *vq)
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{
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void __user *used;
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if (__put_user(vq->used_flags, &vq->used->flags) < 0)
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if (__put_user(cpu_to_vhost16(vq, vq->used_flags), &vq->used->flags) < 0)
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return -EFAULT;
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if (unlikely(vq->log_used)) {
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/* Make sure the flag is seen before log. */
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@ -1019,7 +1019,7 @@ static int vhost_update_used_flags(struct vhost_virtqueue *vq)
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static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
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{
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if (__put_user(vq->avail_idx, vhost_avail_event(vq)))
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if (__put_user(cpu_to_vhost16(vq, vq->avail_idx), vhost_avail_event(vq)))
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return -EFAULT;
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if (unlikely(vq->log_used)) {
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void __user *used;
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@ -1038,7 +1038,7 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event)
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int vhost_init_used(struct vhost_virtqueue *vq)
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{
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u16 last_used_idx;
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__virtio16 last_used_idx;
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int r;
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if (!vq->private_data)
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return 0;
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@ -1052,7 +1052,7 @@ int vhost_init_used(struct vhost_virtqueue *vq)
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r = __get_user(last_used_idx, &vq->used->idx);
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if (r)
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return r;
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vq->last_used_idx = last_used_idx;
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vq->last_used_idx = vhost16_to_cpu(vq, last_used_idx);
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return 0;
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}
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EXPORT_SYMBOL_GPL(vhost_init_used);
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@ -1094,16 +1094,16 @@ static int translate_desc(struct vhost_virtqueue *vq, u64 addr, u32 len,
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/* Each buffer in the virtqueues is actually a chain of descriptors. This
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* function returns the next descriptor in the chain,
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* or -1U if we're at the end. */
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static unsigned next_desc(struct vring_desc *desc)
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static unsigned next_desc(struct vhost_virtqueue *vq, struct vring_desc *desc)
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{
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unsigned int next;
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/* If this descriptor says it doesn't chain, we're done. */
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if (!(desc->flags & VRING_DESC_F_NEXT))
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if (!(desc->flags & cpu_to_vhost16(vq, VRING_DESC_F_NEXT)))
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return -1U;
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/* Check they're not leading us off end of descriptors. */
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next = desc->next;
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next = vhost16_to_cpu(vq, desc->next);
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/* Make sure compiler knows to grab that: we don't want it changing! */
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/* We will use the result as an index in an array, so most
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* architectures only need a compiler barrier here. */
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@ -1120,18 +1120,19 @@ static int get_indirect(struct vhost_virtqueue *vq,
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{
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struct vring_desc desc;
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unsigned int i = 0, count, found = 0;
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u32 len = vhost32_to_cpu(vq, indirect->len);
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int ret;
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/* Sanity check */
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if (unlikely(indirect->len % sizeof desc)) {
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if (unlikely(len % sizeof desc)) {
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vq_err(vq, "Invalid length in indirect descriptor: "
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"len 0x%llx not multiple of 0x%zx\n",
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(unsigned long long)indirect->len,
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(unsigned long long)len,
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sizeof desc);
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return -EINVAL;
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}
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ret = translate_desc(vq, indirect->addr, indirect->len, vq->indirect,
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ret = translate_desc(vq, vhost64_to_cpu(vq, indirect->addr), len, vq->indirect,
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UIO_MAXIOV);
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if (unlikely(ret < 0)) {
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vq_err(vq, "Translation failure %d in indirect.\n", ret);
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@ -1142,7 +1143,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
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* architectures only need a compiler barrier here. */
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read_barrier_depends();
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count = indirect->len / sizeof desc;
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count = len / sizeof desc;
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/* Buffers are chained via a 16 bit next field, so
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* we can have at most 2^16 of these. */
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if (unlikely(count > USHRT_MAX + 1)) {
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@ -1162,16 +1163,17 @@ static int get_indirect(struct vhost_virtqueue *vq,
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if (unlikely(memcpy_fromiovec((unsigned char *)&desc,
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vq->indirect, sizeof desc))) {
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vq_err(vq, "Failed indirect descriptor: idx %d, %zx\n",
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i, (size_t)indirect->addr + i * sizeof desc);
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i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc);
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return -EINVAL;
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}
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if (unlikely(desc.flags & VRING_DESC_F_INDIRECT)) {
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if (unlikely(desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT))) {
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vq_err(vq, "Nested indirect descriptor: idx %d, %zx\n",
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i, (size_t)indirect->addr + i * sizeof desc);
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i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc);
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return -EINVAL;
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}
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ret = translate_desc(vq, desc.addr, desc.len, iov + iov_count,
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ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
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vhost32_to_cpu(vq, desc.len), iov + iov_count,
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iov_size - iov_count);
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if (unlikely(ret < 0)) {
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vq_err(vq, "Translation failure %d indirect idx %d\n",
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@ -1179,11 +1181,11 @@ static int get_indirect(struct vhost_virtqueue *vq,
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return ret;
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}
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/* If this is an input descriptor, increment that count. */
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if (desc.flags & VRING_DESC_F_WRITE) {
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if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
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*in_num += ret;
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if (unlikely(log)) {
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log[*log_num].addr = desc.addr;
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log[*log_num].len = desc.len;
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log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
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log[*log_num].len = vhost32_to_cpu(vq, desc.len);
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++*log_num;
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}
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} else {
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@ -1196,7 +1198,7 @@ static int get_indirect(struct vhost_virtqueue *vq,
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}
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*out_num += ret;
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}
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} while ((i = next_desc(&desc)) != -1);
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} while ((i = next_desc(vq, &desc)) != -1);
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return 0;
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}
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@ -1216,15 +1218,18 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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struct vring_desc desc;
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unsigned int i, head, found = 0;
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u16 last_avail_idx;
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__virtio16 avail_idx;
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__virtio16 ring_head;
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int ret;
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/* Check it isn't doing very strange things with descriptor numbers. */
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last_avail_idx = vq->last_avail_idx;
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if (unlikely(__get_user(vq->avail_idx, &vq->avail->idx))) {
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if (unlikely(__get_user(avail_idx, &vq->avail->idx))) {
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vq_err(vq, "Failed to access avail idx at %p\n",
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&vq->avail->idx);
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return -EFAULT;
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}
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vq->avail_idx = vhost16_to_cpu(vq, avail_idx);
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if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) {
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vq_err(vq, "Guest moved used index from %u to %u",
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@ -1241,7 +1246,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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/* Grab the next descriptor number they're advertising, and increment
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* the index we've seen. */
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if (unlikely(__get_user(head,
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if (unlikely(__get_user(ring_head,
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&vq->avail->ring[last_avail_idx % vq->num]))) {
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vq_err(vq, "Failed to read head: idx %d address %p\n",
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last_avail_idx,
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@ -1249,6 +1254,8 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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return -EFAULT;
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}
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head = vhost16_to_cpu(vq, ring_head);
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/* If their number is silly, that's an error. */
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if (unlikely(head >= vq->num)) {
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vq_err(vq, "Guest says index %u > %u is available",
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@ -1281,7 +1288,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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i, vq->desc + i);
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return -EFAULT;
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}
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if (desc.flags & VRING_DESC_F_INDIRECT) {
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if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT)) {
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ret = get_indirect(vq, iov, iov_size,
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out_num, in_num,
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log, log_num, &desc);
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@ -1293,20 +1300,21 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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continue;
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}
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ret = translate_desc(vq, desc.addr, desc.len, iov + iov_count,
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ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr),
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vhost32_to_cpu(vq, desc.len), iov + iov_count,
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iov_size - iov_count);
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if (unlikely(ret < 0)) {
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vq_err(vq, "Translation failure %d descriptor idx %d\n",
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ret, i);
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return ret;
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}
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if (desc.flags & VRING_DESC_F_WRITE) {
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if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) {
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/* If this is an input descriptor,
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* increment that count. */
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*in_num += ret;
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if (unlikely(log)) {
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log[*log_num].addr = desc.addr;
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log[*log_num].len = desc.len;
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log[*log_num].addr = vhost64_to_cpu(vq, desc.addr);
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log[*log_num].len = vhost32_to_cpu(vq, desc.len);
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++*log_num;
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}
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} else {
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@ -1319,7 +1327,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq,
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}
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*out_num += ret;
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}
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} while ((i = next_desc(&desc)) != -1);
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} while ((i = next_desc(vq, &desc)) != -1);
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/* On success, increment avail index. */
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vq->last_avail_idx++;
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@ -1342,7 +1350,10 @@ EXPORT_SYMBOL_GPL(vhost_discard_vq_desc);
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* want to notify the guest, using eventfd. */
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int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len)
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{
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struct vring_used_elem heads = { head, len };
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struct vring_used_elem heads = {
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cpu_to_vhost32(vq, head),
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cpu_to_vhost32(vq, len)
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};
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return vhost_add_used_n(vq, &heads, 1);
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}
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@ -1411,7 +1422,7 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads,
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/* Make sure buffer is written before we update index. */
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smp_wmb();
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if (__put_user(vq->last_used_idx, &vq->used->idx)) {
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if (__put_user(cpu_to_vhost16(vq, vq->last_used_idx), &vq->used->idx)) {
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vq_err(vq, "Failed to increment used idx");
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return -EFAULT;
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}
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@ -1429,7 +1440,8 @@ EXPORT_SYMBOL_GPL(vhost_add_used_n);
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static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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{
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__u16 old, new, event;
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__u16 old, new;
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__virtio16 event;
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bool v;
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/* Flush out used index updates. This is paired
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* with the barrier that the Guest executes when enabling
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@ -1441,12 +1453,12 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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return true;
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if (!vhost_has_feature(vq, VIRTIO_RING_F_EVENT_IDX)) {
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__u16 flags;
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__virtio16 flags;
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if (__get_user(flags, &vq->avail->flags)) {
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vq_err(vq, "Failed to get flags");
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return true;
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}
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return !(flags & VRING_AVAIL_F_NO_INTERRUPT);
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return !(flags & cpu_to_vhost16(vq, VRING_AVAIL_F_NO_INTERRUPT));
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}
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old = vq->signalled_used;
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v = vq->signalled_used_valid;
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@ -1460,7 +1472,7 @@ static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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vq_err(vq, "Failed to get used event idx");
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return true;
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}
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return vring_need_event(event, new, old);
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return vring_need_event(vhost16_to_cpu(vq, event), new, old);
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}
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/* This actually signals the guest, using eventfd. */
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@ -1495,7 +1507,7 @@ EXPORT_SYMBOL_GPL(vhost_add_used_and_signal_n);
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/* OK, now we need to know about added descriptors. */
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bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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{
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u16 avail_idx;
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__virtio16 avail_idx;
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int r;
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if (!(vq->used_flags & VRING_USED_F_NO_NOTIFY))
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@ -1526,7 +1538,7 @@ bool vhost_enable_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq)
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return false;
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}
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return avail_idx != vq->avail_idx;
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return vhost16_to_cpu(vq, avail_idx) != vq->avail_idx;
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}
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EXPORT_SYMBOL_GPL(vhost_enable_notify);
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