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vfio-iommufd: Support iommufd for physical VFIO devices

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This creates the iommufd_device for the physical VFIO drivers. These are
all the drivers that are calling vfio_register_group_dev() and expect the
type1 code to setup a real iommu_domain against their parent struct
device.

The design gives the driver a choice in how it gets connected to iommufd
by providing bind_iommufd/unbind_iommufd/attach_ioas callbacks to
implement as required. The core code provides three default callbacks for
physical mode using a real iommu_domain. This is suitable for drivers
using vfio_register_group_dev()

Link: https://lore.kernel.org/r/6-v4-42cd2eb0e3eb+335a-vfio_iommufd_jgg@nvidia.com
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Alex Williamson <alex.williamson@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Tested-by: Yu He <yu.he@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Jason Gunthorpe
2022-11-29 16:31:51 -04:00
parent 2a3dab19a0
commit a4d1f91db5
11 changed files with 175 additions and 2 deletions
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25
include/linux/vfio.h
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@@ -17,6 +17,8 @@
#include <linux/iova_bitmap.h>
struct kvm;
struct iommufd_ctx;
struct iommufd_device;
/*
* VFIO devices can be placed in a set, this allows all devices to share this
@@ -54,6 +56,10 @@ struct vfio_device {
struct completion comp;
struct list_head group_next;
struct list_head iommu_entry;
#if IS_ENABLED(CONFIG_IOMMUFD)
struct iommufd_device *iommufd_device;
bool iommufd_attached;
#endif
};
/**
@@ -80,6 +86,10 @@ struct vfio_device_ops {
char *name;
int (*init)(struct vfio_device *vdev);
void (*release)(struct vfio_device *vdev);
int (*bind_iommufd)(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void (*unbind_iommufd)(struct vfio_device *vdev);
int (*attach_ioas)(struct vfio_device *vdev, u32 *pt_id);
int (*open_device)(struct vfio_device *vdev);
void (*close_device)(struct vfio_device *vdev);
ssize_t (*read)(struct vfio_device *vdev, char __user *buf,
@@ -96,6 +106,21 @@ struct vfio_device_ops {
void __user *arg, size_t argsz);
};
#if IS_ENABLED(CONFIG_IOMMUFD)
int vfio_iommufd_physical_bind(struct vfio_device *vdev,
struct iommufd_ctx *ictx, u32 *out_device_id);
void vfio_iommufd_physical_unbind(struct vfio_device *vdev);
int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
#else
#define vfio_iommufd_physical_bind \
((int (*)(struct vfio_device *vdev, struct iommufd_ctx *ictx, \
u32 *out_device_id)) NULL)
#define vfio_iommufd_physical_unbind \
((void (*)(struct vfio_device *vdev)) NULL)
#define vfio_iommufd_physical_attach_ioas \
((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
#endif
/**
* @migration_set_state: Optional callback to change the migration state for
* devices that support migration. It's mandatory for