The guest sends discard requests as u64 sector/count pairs, but the
block layer operates internally with s64/s32 pairs. The conversion
leads to IO errors in the guest, the discard request is not processed.

  domU.cfg:
  'vdev=xvda, format=qcow2, backendtype=qdisk, target=/x.qcow2'
  domU:
  mkfs.ext4 -F /dev/xvda
  Discarding device blocks: failed - Input/output error

Fix this by splitting the request into chunks of BDRV_REQUEST_MAX_SECTORS.
Add input range checking to avoid overflow.

Fixes f3135204 ("xen_disk: add discard support")
Signed-off-by: NOlaf Hering <olaf@aepfle.de>
Reviewed-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NStefano Stabellini <sstabellini@kernel.org>