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| author | Yi Liu <yi.l.liu@intel.com> | 2023-07-18 03:55:35 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2023-07-25 10:17:48 -0600 |
| commit | eda175dfe2484c1e79afaee0f65eeebfb9f89a53 (patch) | |
| tree | 0f01680a30f08db970294d291138fd490911fb95 | |
| parent | 6e6c513fe1d8b53417aa84a56fac5bbda8b3a720 (diff) | |
| download | linux-stable-eda175dfe2484c1e79afaee0f65eeebfb9f89a53.tar.gz linux-stable-eda175dfe2484c1e79afaee0f65eeebfb9f89a53.tar.bz2 linux-stable-eda175dfe2484c1e79afaee0f65eeebfb9f89a53.zip | |
iommufd: Reserve all negative IDs in the iommufd xarray
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>
| -rw-r--r-- | drivers/iommu/iommufd/main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 3fbe636c3d8a..32ce7befc8dd 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -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; |