提交 5d9a07b0 编写于 作者: M Michael S. Tsirkin

vhost: relax used address alignment

virtio 1.0 only requires used address to be 4 byte aligned,
vhost required 8 bytes (size of vring_used_elem).
Fix up vhost to match that.

Additionally, while vhost correctly requires 8 byte
alignment for log, it's unconnected to used ring:
it's a consequence that log has u64 entries.
Tweak code to make that clearer.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
上级 b28e0506
......@@ -713,9 +713,13 @@ long vhost_vring_ioctl(struct vhost_dev *d, int ioctl, void __user *argp)
r = -EFAULT;
break;
}
if ((a.avail_user_addr & (sizeof *vq->avail->ring - 1)) ||
(a.used_user_addr & (sizeof *vq->used->ring - 1)) ||
(a.log_guest_addr & (sizeof *vq->used->ring - 1))) {
/* Make sure it's safe to cast pointers to vring types. */
BUILD_BUG_ON(__alignof__ *vq->avail > VRING_AVAIL_ALIGN_SIZE);
BUILD_BUG_ON(__alignof__ *vq->used > VRING_USED_ALIGN_SIZE);
if ((a.avail_user_addr & (VRING_AVAIL_ALIGN_SIZE - 1)) ||
(a.used_user_addr & (VRING_USED_ALIGN_SIZE - 1)) ||
(a.log_guest_addr & (sizeof(u64) - 1))) {
r = -EINVAL;
break;
}
......
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