map.flags |= VFIO_DMA_MAP_FLAG_WRITE;
}
- if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map)) {
- DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
- return -errno;
+ /*
+ * Try the mapping, if it fails with EBUSY, unmap the region and try
+ * again. This shouldn't be necessary, but we sometimes see it in
+ * the the VGA ROM space.
+ */
+ if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 ||
+ (errno == EBUSY && vfio_dma_unmap(container, iova, size) == 0 &&
+ ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) {
+ return 0;
}
- return 0;
+ DPRINTF("VFIO_MAP_DMA: %d\n", -errno);
+ return -errno;
}
static void vfio_listener_dummy1(MemoryListener *listener)