vfio-ccw: Skip second copy of guest cp to host
We already pinned/copied/unpinned 2K (256 CCWs) of guest memory to the host space anchored off vfio_ccw_private. There's no need to do that again once we have the length calculated, when we could just copy the section we need to the "permanent" space for the I/O. Signed-off-by: NEric Farman <farman@linux.ibm.com> Message-Id: <20190618202352.39702-3-farman@linux.ibm.com> Reviewed-by: NCornelia Huck <cohuck@redhat.com> Reviewed-by: NFarhan Ali <alifm@linux.ibm.com> Signed-off-by: NCornelia Huck <cohuck@redhat.com>
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