In case the 64-bit pci mmio window is larger than the default size of 32G be generous and hand out larger chunks of address space for prefetchable mmio bridge windows. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com>