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iommufd: Reserve all negative IDs in the iommufd xarray

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With this reservation, IOMMUFD users can encode the negative IDs for
specific purposes. e.g. VFIO needs two reserved values to tell userspace
the ID returned is not valid but has other meaning.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Link: https://lore.kernel.org/r/20230718105542.4138-4-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yi Liu 2023-07-18 03:55:35 -07:00 committed by Alex Williamson
parent 6e6c513fe1
commit eda175dfe2
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/iommufd/main.c
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@ -50,7 +50,7 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
* before calling iommufd_object_finalize().
*/
rc = xa_alloc(&ictx->objects, &obj->id, XA_ZERO_ENTRY,
xa_limit_32b, GFP_KERNEL_ACCOUNT);
xa_limit_31b, GFP_KERNEL_ACCOUNT);
if (rc)
goto out_free;
return obj;