From: Yi Liu <yi.l.liu@intel.com>
To: alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com
Cc: joro@8bytes.org, robin.murphy@arm.com, cohuck@redhat.com,
eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org,
mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com,
yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com,
jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com,
lulu@redhat.com, suravee.suthikulpanit@amd.com,
intel-gvt-dev@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org, linux-s390@vger.kernel.org,
xudong.hao@intel.com, yan.y.zhao@intel.com,
terrence.xu@intel.com, yanting.jiang@intel.com,
zhenzhong.duan@intel.com, clegoate@redhat.com
Subject: [PATCH v5 05/10] iommufd: Reserve all negative IDs in the iommufd xarray
Date: Sat, 13 May 2023 06:21:31 -0700 [thread overview]
Message-ID: <20230513132136.15021-6-yi.l.liu@intel.com> (raw)
In-Reply-To: <20230513132136.15021-1-yi.l.liu@intel.com>
Hence 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.
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
drivers/iommu/iommufd/main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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;
--
2.34.1
next prev parent reply other threads:[~2023-05-13 13:21 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-13 13:21 [PATCH v5 00/10] Enhance vfio PCI hot reset for vfio cdev device Yi Liu
2023-05-13 13:21 ` [PATCH v5 01/10] vfio-iommufd: Create iommufd_access for noiommu devices Yi Liu
2023-05-17 17:26 ` Alex Williamson
2023-05-17 18:20 ` Jason Gunthorpe
2023-05-18 12:23 ` Liu, Yi L
2023-05-18 19:43 ` Alex Williamson
2023-05-13 13:21 ` [PATCH v5 02/10] vfio/pci: Update comment around group_fd get in vfio_pci_ioctl_pci_hot_reset() Yi Liu
2023-05-13 13:21 ` [PATCH v5 03/10] vfio/pci: Move the existing hot reset logic to be a helper Yi Liu
2023-05-13 13:21 ` [PATCH v5 04/10] vfio: Mark cdev usage in vfio_device Yi Liu
2023-05-13 13:21 ` Yi Liu [this message]
2023-05-13 13:21 ` [PATCH v5 06/10] vfio-iommufd: Add helper to retrieve iommufd_ctx and devid for vfio_device Yi Liu
2023-05-17 18:15 ` Alex Williamson
2023-05-17 18:22 ` Jason Gunthorpe
2023-05-17 18:40 ` Alex Williamson
2023-05-17 18:43 ` Jason Gunthorpe
2023-05-18 13:25 ` Liu, Yi L
2023-05-18 19:50 ` Alex Williamson
2023-05-19 7:57 ` Tian, Kevin
2023-05-13 13:21 ` [PATCH v5 07/10] vfio: Add helper to search vfio_device in a dev_set Yi Liu
2023-05-15 7:11 ` Cédric Le Goater
2023-05-17 19:12 ` Alex Williamson
2023-05-18 12:31 ` Liu, Yi L
2023-05-18 19:45 ` Alex Williamson
2023-05-13 13:21 ` [PATCH v5 08/10] iommufd: Add iommufd_ctx_has_group() Yi Liu
2023-05-17 19:40 ` Alex Williamson
2023-05-18 12:33 ` Liu, Yi L
2023-05-13 13:21 ` [PATCH v5 09/10] vfio/pci: Extend VFIO_DEVICE_GET_PCI_HOT_RESET_INFO for vfio device cdev Yi Liu
2023-05-15 7:29 ` Cédric Le Goater
2023-05-15 7:47 ` Liu, Yi L
2023-05-17 22:01 ` Alex Williamson
2023-05-18 13:21 ` Liu, Yi L
2023-05-18 13:31 ` Liu, Yi L
2023-05-18 19:53 ` Alex Williamson
2023-05-18 20:02 ` Alex Williamson
2023-05-13 13:21 ` [PATCH v5 10/10] vfio/pci: Allow passing zero-length fd array in VFIO_DEVICE_PCI_HOT_RESET Yi Liu
2023-05-18 5:51 ` [PATCH v5 00/10] Enhance vfio PCI hot reset for vfio cdev device Xu, Terrence
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