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vfio-iommufd: Move noiommu compat validation out of vfio_iommufd_bind() 

This moves the noiommu compat validation logic into vfio_df_group_open().
This is more consistent with what will be done in vfio device cdev path.

Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Terrence Xu <terrence.xu@intel.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yanting Jiang <yanting.jiang@intel.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.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/20230718135551.6592-11-yi.l.liu@intel.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yi Liu 2023-07-18 06:55:35 -07:00 committed by Alex Williamson
parent 839e692fa4
commit 6086efe734
3 changed files with 30 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/vfio/group.c
View File

@ -192,6 +192,19 @@ static int vfio_df_group_open(struct vfio_device_file *df)
vfio_device_group_get_kvm_safe(device);
df->iommufd = device->group->iommufd;
if (df->iommufd && vfio_device_is_noiommu(device) && device->open_count == 0) {
/*
* Require no compat ioas to be assigned to proceed. The basic
* statement is that the user cannot have done something that
* implies they expected translation to exist
*/
if (!capable(CAP_SYS_RAWIO) ||
vfio_iommufd_device_has_compat_ioas(device, df->iommufd))
ret = -EPERM;
else
ret = 0;
goto out_put_kvm;
}
ret = vfio_df_open(df);
if (ret) {

22
drivers/vfio/iommufd.c
View File

@ -10,6 +10,14 @@
MODULE_IMPORT_NS(IOMMUFD);
MODULE_IMPORT_NS(IOMMUFD_VFIO);
bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
struct iommufd_ctx *ictx)
{
u32 ioas_id;
return !iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id);
}
int vfio_iommufd_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx)
{
u32 ioas_id;
@ -18,20 +26,6 @@ int vfio_iommufd_bind(struct vfio_device *vdev, struct iommufd_ctx *ictx)
lockdep_assert_held(&vdev->dev_set->lock);
if (vfio_device_is_noiommu(vdev)) {
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
/*
* Require no compat ioas to be assigned to proceed. The basic
* statement is that the user cannot have done something that
* implies they expected translation to exist
*/
if (!iommufd_vfio_compat_ioas_get_id(ictx, &ioas_id))
return -EPERM;
return 0;
}
ret = vdev->ops->bind_iommufd(vdev, ictx, &device_id);
if (ret)
return ret;

9
drivers/vfio/vfio.h
View File

@ -234,9 +234,18 @@ static inline void vfio_container_cleanup(void)
#endif
#if IS_ENABLED(CONFIG_IOMMUFD)
bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
struct iommufd_ctx *ictx);
int vfio_iommufd_bind(struct vfio_device *device, struct iommufd_ctx *ictx);
void vfio_iommufd_unbind(struct vfio_device *device);
#else
static inline bool
vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
struct iommufd_ctx *ictx)
{
return false;
}
static inline int vfio_iommufd_bind(struct vfio_device *device,
struct iommufd_ctx *ictx)
{