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vfio/iommufd: Support unmap all in one ioctl()

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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 <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20251009040134.334251-3-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2025-10-09 00:01:33 -04:00 • committed by Cédric Le Goater
parent 962bcf0911
commit b30823e561
1 changed files with 1 additions and 14 deletions
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15
hw/vfio/iommufd.c
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@ -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) */