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vfio-iommufd: Support pasid [at|de]tach for physical VFIO devices

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This adds pasid_at|de]tach_ioas ops for attaching hwpt to pasid of a
device and the helpers for it. For now, only vfio-pci supports pasid
attach/detach.

Link: https://patch.msgid.link/r/20250321180143.8468-3-yi.l.liu@intel.com
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Yi Liu 2025-03-21 11:01:40 -07:00 • committed by Jason Gunthorpe
parent 7fe6b98716
commit 290641346d
3 changed files with 66 additions and 0 deletions
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50
drivers/vfio/iommufd.c
View file

@ -119,14 +119,22 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev,
if (IS_ERR(idev))
return PTR_ERR(idev);
vdev->iommufd_device = idev;
ida_init(&vdev->pasids);
return 0;
}
EXPORT_SYMBOL_GPL(vfio_iommufd_physical_bind);
void vfio_iommufd_physical_unbind(struct vfio_device *vdev)
{
int pasid;
lockdep_assert_held(&vdev->dev_set->lock);
while ((pasid = ida_find_first(&vdev->pasids)) >= 0) {
iommufd_device_detach(vdev->iommufd_device, pasid);
ida_free(&vdev->pasids, pasid);
}
if (vdev->iommufd_attached) {
iommufd_device_detach(vdev->iommufd_device, IOMMU_NO_PASID);
vdev->iommufd_attached = false;
@ -170,6 +178,48 @@ void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev)
}
EXPORT_SYMBOL_GPL(vfio_iommufd_physical_detach_ioas);
int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev,
u32 pasid, u32 *pt_id)
{
int rc;
lockdep_assert_held(&vdev->dev_set->lock);
if (WARN_ON(!vdev->iommufd_device))
return -EINVAL;
if (ida_exists(&vdev->pasids, pasid))
return iommufd_device_replace(vdev->iommufd_device,
pasid, pt_id);
rc = ida_alloc_range(&vdev->pasids, pasid, pasid, GFP_KERNEL);
if (rc < 0)
return rc;
rc = iommufd_device_attach(vdev->iommufd_device, pasid, pt_id);
if (rc)
ida_free(&vdev->pasids, pasid);
return rc;
}
EXPORT_SYMBOL_GPL(vfio_iommufd_physical_pasid_attach_ioas);
void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev,
u32 pasid)
{
lockdep_assert_held(&vdev->dev_set->lock);
if (WARN_ON(!vdev->iommufd_device))
return;
if (!ida_exists(&vdev->pasids, pasid))
return;
iommufd_device_detach(vdev->iommufd_device, pasid);
ida_free(&vdev->pasids, pasid);
}
EXPORT_SYMBOL_GPL(vfio_iommufd_physical_pasid_detach_ioas);
/*
* The emulated standard ops mean that vfio_device is going to use the
* "mdev path" and will call vfio_pin_pages()/vfio_dma_rw(). Drivers using this

2
drivers/vfio/pci/vfio_pci.c
View file

@ -144,6 +144,8 @@ static const struct vfio_device_ops vfio_pci_ops = {
.unbind_iommufd = vfio_iommufd_physical_unbind,
.attach_ioas = vfio_iommufd_physical_attach_ioas,
.detach_ioas = vfio_iommufd_physical_detach_ioas,
.pasid_attach_ioas = vfio_iommufd_physical_pasid_attach_ioas,
.pasid_detach_ioas = vfio_iommufd_physical_pasid_detach_ioas,
};
static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)

14
include/linux/vfio.h
View file

@ -67,6 +67,7 @@ struct vfio_device {
struct inode *inode;
#if IS_ENABLED(CONFIG_IOMMUFD)
struct iommufd_device *iommufd_device;
struct ida pasids;
u8 iommufd_attached:1;
#endif
u8 cdev_opened:1;
@ -91,6 +92,8 @@ struct vfio_device {
* bound iommufd. Undo in unbind_iommufd if @detach_ioas is not
* called.
* @detach_ioas: Opposite of attach_ioas
* @pasid_attach_ioas: The pasid variation of attach_ioas
* @pasid_detach_ioas: Opposite of pasid_attach_ioas
* @open_device: Called when the first file descriptor is opened for this device
* @close_device: Opposite of open_device
* @read: Perform read(2) on device file descriptor
@ -115,6 +118,9 @@ struct vfio_device_ops {
void (*unbind_iommufd)(struct vfio_device *vdev);
int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
void (*detach_ioas)(struct vfio_device *vdev);
int (*pasid_attach_ioas)(struct vfio_device *vdev, u32 pasid,
u32 *pt_id);
void (*pasid_detach_ioas)(struct vfio_device *vdev, u32 pasid);
int (*open_device)(struct vfio_device *vdev);
void (*close_device)(struct vfio_device *vdev);
ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
@ -139,6 +145,10 @@ int vfio_iommufd_physical_bind(struct vfio_device *vdev,
void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
void vfio_iommufd_physical_detach_ioas(struct vfio_device *vdev);
int vfio_iommufd_physical_pasid_attach_ioas(struct vfio_device *vdev,
u32 pasid, u32 *pt_id);
void vfio_iommufd_physical_pasid_detach_ioas(struct vfio_device *vdev,
u32 pasid);
int vfio_iommufd_emulated_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_emulated_unbind(struct vfio_device *vdev);
@ -166,6 +176,10 @@ vfio_iommufd_get_dev_id(struct vfio_device *vdev, struct iommufd_ctx *ictx)
((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
#define vfio_iommufd_physical_detach_ioas \
((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_physical_pasid_attach_ioas \
((int (*)(struct vfio_device *vdev, u32 pasid, u32 *pt_id)) NULL)
#define vfio_iommufd_physical_pasid_detach_ioas \
((void (*)(struct vfio_device *vdev, u32 pasid)) NULL)
#define vfio_iommufd_emulated_bind \
((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \
u32 *out_device_id)) NULL)