diff mbox series

[v10,03/10] iommufd: Reserve all negative IDs in the iommufd xarray

Message ID 20230718105542.4138-4-yi.l.liu@intel.com (mailing list archive)
State New, archived
Headers show
Series Enhance vfio PCI hot reset for vfio cdev device | expand

Commit Message

Yi Liu July 18, 2023, 10:55 a.m. UTC 
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>
---
 drivers/iommu/iommufd/main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

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;