vhost: add vsock compat ioctl

This will allow usage of vsock from 32-bit binaries on a 64-bit
kernel.

Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 0d14e2ff19f1..ee0c385d9fe5 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -699,12 +699,23 @@ static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
         }
 }
 
+#ifdef CONFIG_COMPAT
+static long vhost_vsock_dev_compat_ioctl(struct file *f, unsigned int ioctl,
+                                         unsigned long arg)
+{
+        return vhost_vsock_dev_ioctl(f, ioctl, (unsigned long)compat_ptr(arg));
+}
+#endif
+
 static const struct file_operations vhost_vsock_fops = {
         .owner          = THIS_MODULE,
         .open           = vhost_vsock_dev_open,
         .release        = vhost_vsock_dev_release,
         .llseek         = noop_llseek,
         .unlocked_ioctl = vhost_vsock_dev_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = vhost_vsock_dev_compat_ioctl,
+#endif
 };
 
 static struct miscdevice vhost_vsock_misc = {