From: Zhenzhong Duan Date: Thu, 9 Oct 2025 04:01:33 +0000 (-0400) Subject: vfio/iommufd: Support unmap all in one ioctl() X-Git-Tag: v10.2.0-rc1~50^2~5 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=b30823e5619ed5658d33e43abe1308195edb3e8b;p=thirdparty%2Fqemu.git vfio/iommufd: Support unmap all in one ioctl() IOMMUFD kernel uAPI supports unmapping whole address space in one call with [iova, size] set to [0, UINT64_MAX], this can simplify iommufd_cdev_unmap() a bit. See iommufd_ioas_unmap() in kernel for details. Signed-off-by: Zhenzhong Duan Reviewed-by: Cédric Le Goater Link: https://lore.kernel.org/qemu-devel/20251009040134.334251-3-zhenzhong.duan@intel.com Signed-off-by: Cédric Le Goater --- diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index 24a99efa87..fc9cd9d22f 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -62,21 +62,8 @@ static int iommufd_cdev_unmap(const VFIOContainer *bcontainer, { const VFIOIOMMUFDContainer *container = VFIO_IOMMU_IOMMUFD(bcontainer); - /* unmap in halves */ if (unmap_all) { - Int128 llsize = int128_rshift(int128_2_64(), 1); - int ret; - - ret = iommufd_backend_unmap_dma(container->be, container->ioas_id, - 0, int128_get64(llsize)); - - if (ret == 0) { - ret = iommufd_backend_unmap_dma(container->be, container->ioas_id, - int128_get64(llsize), - int128_get64(llsize)); - } - - return ret; + size = UINT64_MAX; } /* TODO: Handle dma_unmap_bitmap with iotlb args (migration) */