diff mbox series

[v7,3/9] iommufd: Reserve all negative IDs in the iommufd xarray

Message ID 20230602121515.79374-4-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 June 2, 2023, 12:15 p.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.

Tested-by: Terrence Xu <terrence.xu@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(-)

Comments

Jason Gunthorpe June 13, 2023, 11:46 a.m. UTC | #1 
On Fri, Jun 02, 2023 at 05:15:09AM -0700, Yi Liu wrote:
> 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.
> 
> Tested-by: Terrence Xu <terrence.xu@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(-)

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason
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;