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linux/drivers/vfio/vfio.h
Paolo Bonzini 09e33b0455 vfio: replace CONFIG_HAVE_KVM with IS_ENABLED(CONFIG_KVM) 
It is more accurate to Check if KVM is enabled, instead of having the
architecture say so.  Architectures always "have" KVM, so for example
checking CONFIG_HAVE_KVM in vfio code is pointless, but if KVM is disabled
in a specific build, there is no need for support code.

Alternatively, the #ifdefs could simply be deleted.  However, this
would add dead code.  For example, when KVM is disabled, there is no
need to include code in VFIO that uses symbol_get, as that symbol_get
would always fail.

Cc: Alex Williamson <alex.williamson@redhat.com>
Cc: x86@kernel.org
Cc: kbingham@kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2024-02-08 08:45:35 -05:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
* Author: Alex Williamson <alex.williamson@redhat.com>
*/
#ifndef __VFIO_VFIO_H__
#define __VFIO_VFIO_H__
#include <linux/file.h>
#include <linux/device.h>
#include <linux/cdev.h>
#include <linux/module.h>
#include <linux/vfio.h>
struct iommufd_ctx;
struct iommu_group;
struct vfio_container;
struct vfio_device_file {
struct vfio_device *device;
struct vfio_group *group;
u8 access_granted;
u32 devid; /* only valid when iommufd is valid */
spinlock_t kvm_ref_lock; /* protect kvm field */
struct kvm *kvm;
struct iommufd_ctx *iommufd; /* protected by struct vfio_device_set::lock */
};
void vfio_device_put_registration(struct vfio_device *device);
bool vfio_device_try_get_registration(struct vfio_device *device);
int vfio_df_open(struct vfio_device_file *df);
void vfio_df_close(struct vfio_device_file *df);
struct vfio_device_file *
vfio_allocate_device_file(struct vfio_device *device);
extern const struct file_operations vfio_device_fops;
#ifdef CONFIG_VFIO_NOIOMMU
extern bool vfio_noiommu __read_mostly;
#else
enum { vfio_noiommu = false };
#endif
enum vfio_group_type {
/*
* Physical device with IOMMU backing.
*/
VFIO_IOMMU,
/*
* Virtual device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. The user of these devices must not be able to
* directly trigger unmediated DMA.
*/
VFIO_EMULATED_IOMMU,
/*
* Physical device without IOMMU backing. The VFIO core fakes up an
* iommu_group as the iommu_group sysfs interface is part of the
* userspace ABI. Users can trigger unmediated DMA by the device,
* usage is highly dangerous, requires an explicit opt-in and will
* taint the kernel.
*/
VFIO_NO_IOMMU,
};
#if IS_ENABLED(CONFIG_VFIO_GROUP)
struct vfio_group {
struct device dev;
struct cdev cdev;
/*
* When drivers is non-zero a driver is attached to the struct device
* that provided the iommu_group and thus the iommu_group is a valid
* pointer. When drivers is 0 the driver is being detached. Once users
* reaches 0 then the iommu_group is invalid.
*/
refcount_t drivers;
unsigned int container_users;
struct iommu_group *iommu_group;
struct vfio_container *container;
struct list_head device_list;
struct mutex device_lock;
struct list_head vfio_next;
#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
struct list_head container_next;
#endif
enum vfio_group_type type;
struct mutex group_lock;
struct kvm *kvm;
struct file *opened_file;
struct blocking_notifier_head notifier;
struct iommufd_ctx *iommufd;
spinlock_t kvm_ref_lock;
unsigned int cdev_device_open_cnt;
};
int vfio_device_block_group(struct vfio_device *device);
void vfio_device_unblock_group(struct vfio_device *device);
int vfio_device_set_group(struct vfio_device *device,
enum vfio_group_type type);
void vfio_device_remove_group(struct vfio_device *device);
void vfio_device_group_register(struct vfio_device *device);
void vfio_device_group_unregister(struct vfio_device *device);
int vfio_device_group_use_iommu(struct vfio_device *device);
void vfio_device_group_unuse_iommu(struct vfio_device *device);
void vfio_df_group_close(struct vfio_device_file *df);
struct vfio_group *vfio_group_from_file(struct file *file);
bool vfio_group_enforced_coherent(struct vfio_group *group);
void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
bool vfio_device_has_container(struct vfio_device *device);
int __init vfio_group_init(void);
void vfio_group_cleanup(void);
static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
{
return IS_ENABLED(CONFIG_VFIO_NOIOMMU) &&
vdev->group->type == VFIO_NO_IOMMU;
}
#else
struct vfio_group;
static inline int vfio_device_block_group(struct vfio_device *device)
{
return 0;
}
static inline void vfio_device_unblock_group(struct vfio_device *device)
{
}
static inline int vfio_device_set_group(struct vfio_device *device,
enum vfio_group_type type)
{
return 0;
}
static inline void vfio_device_remove_group(struct vfio_device *device)
{
}
static inline void vfio_device_group_register(struct vfio_device *device)
{
}
static inline void vfio_device_group_unregister(struct vfio_device *device)
{
}
static inline int vfio_device_group_use_iommu(struct vfio_device *device)
{
return -EOPNOTSUPP;
}
static inline void vfio_device_group_unuse_iommu(struct vfio_device *device)
{
}
static inline void vfio_df_group_close(struct vfio_device_file *df)
{
}
static inline struct vfio_group *vfio_group_from_file(struct file *file)
{
return NULL;
}
static inline bool vfio_group_enforced_coherent(struct vfio_group *group)
{
return true;
}
static inline void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
{
}
static inline bool vfio_device_has_container(struct vfio_device *device)
{
return false;
}
static inline int __init vfio_group_init(void)
{
return 0;
}
static inline void vfio_group_cleanup(void)
{
}
static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
{
return false;
}
#endif /* CONFIG_VFIO_GROUP */
#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
/**
* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
*/
struct vfio_iommu_driver_ops {
char *name;
struct module *owner;
void *(*open)(unsigned long arg);
void (*release)(void *iommu_data);
long (*ioctl)(void *iommu_data, unsigned int cmd,
unsigned long arg);
int (*attach_group)(void *iommu_data,
struct iommu_group *group,
enum vfio_group_type);
void (*detach_group)(void *iommu_data,
struct iommu_group *group);
int (*pin_pages)(void *iommu_data,
struct iommu_group *group,
dma_addr_t user_iova,
int npage, int prot,
struct page **pages);
void (*unpin_pages)(void *iommu_data,
dma_addr_t user_iova, int npage);
void (*register_device)(void *iommu_data,
struct vfio_device *vdev);
void (*unregister_device)(void *iommu_data,
struct vfio_device *vdev);
int (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
void *data, size_t count, bool write);
struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
struct iommu_group *group);
};
struct vfio_iommu_driver {
const struct vfio_iommu_driver_ops *ops;
struct list_head vfio_next;
};
int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);
struct vfio_container *vfio_container_from_file(struct file *filep);
int vfio_group_use_container(struct vfio_group *group);
void vfio_group_unuse_container(struct vfio_group *group);
int vfio_container_attach_group(struct vfio_container *container,
struct vfio_group *group);
void vfio_group_detach_container(struct vfio_group *group);
void vfio_device_container_register(struct vfio_device *device);
void vfio_device_container_unregister(struct vfio_device *device);
int vfio_device_container_pin_pages(struct vfio_device *device,
dma_addr_t iova, int npage,
int prot, struct page **pages);
void vfio_device_container_unpin_pages(struct vfio_device *device,
dma_addr_t iova, int npage);
int vfio_device_container_dma_rw(struct vfio_device *device,
dma_addr_t iova, void *data,
size_t len, bool write);
int __init vfio_container_init(void);
void vfio_container_cleanup(void);
#else
static inline struct vfio_container *
vfio_container_from_file(struct file *filep)
{
return NULL;
}
static inline int vfio_group_use_container(struct vfio_group *group)
{
return -EOPNOTSUPP;
}
static inline void vfio_group_unuse_container(struct vfio_group *group)
{
}
static inline int vfio_container_attach_group(struct vfio_container *container,
struct vfio_group *group)
{
return -EOPNOTSUPP;
}
static inline void vfio_group_detach_container(struct vfio_group *group)
{
}
static inline void vfio_device_container_register(struct vfio_device *device)
{
}
static inline void vfio_device_container_unregister(struct vfio_device *device)
{
}
static inline int vfio_device_container_pin_pages(struct vfio_device *device,
dma_addr_t iova, int npage,
int prot, struct page **pages)
{
return -EOPNOTSUPP;
}
static inline void vfio_device_container_unpin_pages(struct vfio_device *device,
dma_addr_t iova, int npage)
{
}
static inline int vfio_device_container_dma_rw(struct vfio_device *device,
dma_addr_t iova, void *data,
size_t len, bool write)
{
return -EOPNOTSUPP;
}
static inline int vfio_container_init(void)
{
return 0;
}
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_df_iommufd_bind(struct vfio_device_file *df);
void vfio_df_iommufd_unbind(struct vfio_device_file *df);
int vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
struct iommufd_ctx *ictx);
#else
static inline bool
vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
struct iommufd_ctx *ictx)
{
return false;
}
static inline int vfio_df_iommufd_bind(struct vfio_device_file *fd)
{
return -EOPNOTSUPP;
}
static inline void vfio_df_iommufd_unbind(struct vfio_device_file *df)
{
}
static inline int
vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
struct iommufd_ctx *ictx)
{
return -EOPNOTSUPP;
}
#endif
int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
struct vfio_device_attach_iommufd_pt __user *arg);
int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
struct vfio_device_detach_iommufd_pt __user *arg);
#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
void vfio_init_device_cdev(struct vfio_device *device);
static inline int vfio_device_add(struct vfio_device *device)
{
/* cdev does not support noiommu device */
if (vfio_device_is_noiommu(device))
return device_add(&device->device);
vfio_init_device_cdev(device);
return cdev_device_add(&device->cdev, &device->device);
}
static inline void vfio_device_del(struct vfio_device *device)
{
if (vfio_device_is_noiommu(device))
device_del(&device->device);
else
cdev_device_del(&device->cdev, &device->device);
}
int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep);
long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
struct vfio_device_bind_iommufd __user *arg);
void vfio_df_unbind_iommufd(struct vfio_device_file *df);
int vfio_cdev_init(struct class *device_class);
void vfio_cdev_cleanup(void);
#else
static inline void vfio_init_device_cdev(struct vfio_device *device)
{
}
static inline int vfio_device_add(struct vfio_device *device)
{
return device_add(&device->device);
}
static inline void vfio_device_del(struct vfio_device *device)
{
device_del(&device->device);
}
static inline int vfio_device_fops_cdev_open(struct inode *inode,
struct file *filep)
{
return 0;
}
static inline long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
struct vfio_device_bind_iommufd __user *arg)
{
return -ENOTTY;
}
static inline void vfio_df_unbind_iommufd(struct vfio_device_file *df)
{
}
static inline int vfio_cdev_init(struct class *device_class)
{
return 0;
}
static inline void vfio_cdev_cleanup(void)
{
}
#endif /* CONFIG_VFIO_DEVICE_CDEV */
#if IS_ENABLED(CONFIG_VFIO_VIRQFD)
int __init vfio_virqfd_init(void);
void vfio_virqfd_exit(void);
#else
static inline int __init vfio_virqfd_init(void)
{
return 0;
}
static inline void vfio_virqfd_exit(void)
{
}
#endif
#if IS_ENABLED(CONFIG_KVM)
void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
void vfio_device_put_kvm(struct vfio_device *device);
#else
static inline void vfio_device_get_kvm_safe(struct vfio_device *device,
struct kvm *kvm)
{
}
static inline void vfio_device_put_kvm(struct vfio_device *device)
{
}
#endif
#ifdef CONFIG_VFIO_DEBUGFS
void vfio_debugfs_create_root(void);
void vfio_debugfs_remove_root(void);
void vfio_device_debugfs_init(struct vfio_device *vdev);
void vfio_device_debugfs_exit(struct vfio_device *vdev);
#else
static inline void vfio_debugfs_create_root(void) { }
static inline void vfio_debugfs_remove_root(void) { }
static inline void vfio_device_debugfs_init(struct vfio_device *vdev) { }
static inline void vfio_device_debugfs_exit(struct vfio_device *vdev) { }
#endif /* CONFIG_VFIO_DEBUGFS */
#endif
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