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2202844e44
There are multiple devices, software and operational steps involved
in the process of live migration. An error occurred on any node may
cause the live migration operation to fail.
This complex process makes it very difficult to locate and analyze
the cause when the function fails.
In order to quickly locate the cause of the problem when the
live migration fails, I added a set of debugfs to the vfio
live migration driver.
+-------------------------------------------+
| |
| |
| QEMU |
| |
| |
+---+----------------------------+----------+
| ^ | ^
| | | |
| | | |
v | v |
+---------+--+ +---------+--+
|src vfio_dev| |dst vfio_dev|
+--+---------+ +--+---------+
| ^ | ^
| | | |
v | | |
+-----------+----+ +-----------+----+
|src dev debugfs | |dst dev debugfs |
+----------------+ +----------------+
The entire debugfs directory will be based on the definition of
the CONFIG_DEBUG_FS macro. If this macro is not enabled, the
interfaces in vfio.h will be empty definitions, and the creation
and initialization of the debugfs directory will not be executed.
vfio
|
+---<dev_name1>
| +---migration
| +--state
|
+---<dev_name2>
+---migration
+--state
debugfs will create a public root directory "vfio" file.
then create a dev_name() file for each live migration device.
First, create a unified state acquisition file of "migration"
in this device directory.
Then, create a public live migration state lookup file "state".
Signed-off-by: Longfang Liu <liulongfang@huawei.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/r/20231106072225.28577-2-liulongfang@huawei.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
466 lines
12 KiB
C
466 lines
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*/
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#ifndef __VFIO_VFIO_H__
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#define __VFIO_VFIO_H__
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#include <linux/file.h>
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#include <linux/device.h>
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#include <linux/cdev.h>
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#include <linux/module.h>
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#include <linux/vfio.h>
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struct iommufd_ctx;
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struct iommu_group;
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struct vfio_container;
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struct vfio_device_file {
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struct vfio_device *device;
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struct vfio_group *group;
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u8 access_granted;
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u32 devid; /* only valid when iommufd is valid */
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spinlock_t kvm_ref_lock; /* protect kvm field */
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struct kvm *kvm;
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struct iommufd_ctx *iommufd; /* protected by struct vfio_device_set::lock */
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};
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void vfio_device_put_registration(struct vfio_device *device);
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bool vfio_device_try_get_registration(struct vfio_device *device);
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int vfio_df_open(struct vfio_device_file *df);
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void vfio_df_close(struct vfio_device_file *df);
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struct vfio_device_file *
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vfio_allocate_device_file(struct vfio_device *device);
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extern const struct file_operations vfio_device_fops;
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#ifdef CONFIG_VFIO_NOIOMMU
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extern bool vfio_noiommu __read_mostly;
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#else
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enum { vfio_noiommu = false };
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#endif
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enum vfio_group_type {
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/*
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* Physical device with IOMMU backing.
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*/
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VFIO_IOMMU,
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/*
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* Virtual device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. The user of these devices must not be able to
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* directly trigger unmediated DMA.
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*/
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VFIO_EMULATED_IOMMU,
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/*
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* Physical device without IOMMU backing. The VFIO core fakes up an
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* iommu_group as the iommu_group sysfs interface is part of the
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* userspace ABI. Users can trigger unmediated DMA by the device,
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* usage is highly dangerous, requires an explicit opt-in and will
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* taint the kernel.
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*/
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VFIO_NO_IOMMU,
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};
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#if IS_ENABLED(CONFIG_VFIO_GROUP)
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struct vfio_group {
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struct device dev;
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struct cdev cdev;
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/*
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* When drivers is non-zero a driver is attached to the struct device
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* that provided the iommu_group and thus the iommu_group is a valid
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* pointer. When drivers is 0 the driver is being detached. Once users
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* reaches 0 then the iommu_group is invalid.
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*/
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refcount_t drivers;
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unsigned int container_users;
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struct iommu_group *iommu_group;
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struct vfio_container *container;
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struct list_head device_list;
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struct mutex device_lock;
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struct list_head vfio_next;
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#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
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struct list_head container_next;
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#endif
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enum vfio_group_type type;
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struct mutex group_lock;
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struct kvm *kvm;
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struct file *opened_file;
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struct blocking_notifier_head notifier;
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struct iommufd_ctx *iommufd;
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spinlock_t kvm_ref_lock;
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unsigned int cdev_device_open_cnt;
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};
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int vfio_device_block_group(struct vfio_device *device);
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void vfio_device_unblock_group(struct vfio_device *device);
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int vfio_device_set_group(struct vfio_device *device,
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enum vfio_group_type type);
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void vfio_device_remove_group(struct vfio_device *device);
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void vfio_device_group_register(struct vfio_device *device);
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void vfio_device_group_unregister(struct vfio_device *device);
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int vfio_device_group_use_iommu(struct vfio_device *device);
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void vfio_device_group_unuse_iommu(struct vfio_device *device);
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void vfio_df_group_close(struct vfio_device_file *df);
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struct vfio_group *vfio_group_from_file(struct file *file);
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bool vfio_group_enforced_coherent(struct vfio_group *group);
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void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm);
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bool vfio_device_has_container(struct vfio_device *device);
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int __init vfio_group_init(void);
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void vfio_group_cleanup(void);
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static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
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{
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return IS_ENABLED(CONFIG_VFIO_NOIOMMU) &&
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vdev->group->type == VFIO_NO_IOMMU;
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}
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#else
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struct vfio_group;
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static inline int vfio_device_block_group(struct vfio_device *device)
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{
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return 0;
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}
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static inline void vfio_device_unblock_group(struct vfio_device *device)
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{
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}
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static inline int vfio_device_set_group(struct vfio_device *device,
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enum vfio_group_type type)
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{
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return 0;
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}
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static inline void vfio_device_remove_group(struct vfio_device *device)
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{
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}
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static inline void vfio_device_group_register(struct vfio_device *device)
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{
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}
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static inline void vfio_device_group_unregister(struct vfio_device *device)
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{
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}
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static inline int vfio_device_group_use_iommu(struct vfio_device *device)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_device_group_unuse_iommu(struct vfio_device *device)
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{
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}
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static inline void vfio_df_group_close(struct vfio_device_file *df)
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{
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}
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static inline struct vfio_group *vfio_group_from_file(struct file *file)
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{
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return NULL;
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}
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static inline bool vfio_group_enforced_coherent(struct vfio_group *group)
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{
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return true;
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}
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static inline void vfio_group_set_kvm(struct vfio_group *group, struct kvm *kvm)
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{
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}
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static inline bool vfio_device_has_container(struct vfio_device *device)
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{
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return false;
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}
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static inline int __init vfio_group_init(void)
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{
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return 0;
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}
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static inline void vfio_group_cleanup(void)
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{
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}
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static inline bool vfio_device_is_noiommu(struct vfio_device *vdev)
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{
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return false;
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}
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#endif /* CONFIG_VFIO_GROUP */
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#if IS_ENABLED(CONFIG_VFIO_CONTAINER)
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/**
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* struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
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*/
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struct vfio_iommu_driver_ops {
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char *name;
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struct module *owner;
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void *(*open)(unsigned long arg);
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void (*release)(void *iommu_data);
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long (*ioctl)(void *iommu_data, unsigned int cmd,
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unsigned long arg);
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int (*attach_group)(void *iommu_data,
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struct iommu_group *group,
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enum vfio_group_type);
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void (*detach_group)(void *iommu_data,
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struct iommu_group *group);
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int (*pin_pages)(void *iommu_data,
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struct iommu_group *group,
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dma_addr_t user_iova,
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int npage, int prot,
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struct page **pages);
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void (*unpin_pages)(void *iommu_data,
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dma_addr_t user_iova, int npage);
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void (*register_device)(void *iommu_data,
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struct vfio_device *vdev);
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void (*unregister_device)(void *iommu_data,
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struct vfio_device *vdev);
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int (*dma_rw)(void *iommu_data, dma_addr_t user_iova,
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void *data, size_t count, bool write);
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struct iommu_domain *(*group_iommu_domain)(void *iommu_data,
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struct iommu_group *group);
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};
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struct vfio_iommu_driver {
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const struct vfio_iommu_driver_ops *ops;
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struct list_head vfio_next;
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};
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int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops);
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struct vfio_container *vfio_container_from_file(struct file *filep);
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int vfio_group_use_container(struct vfio_group *group);
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void vfio_group_unuse_container(struct vfio_group *group);
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int vfio_container_attach_group(struct vfio_container *container,
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struct vfio_group *group);
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void vfio_group_detach_container(struct vfio_group *group);
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void vfio_device_container_register(struct vfio_device *device);
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void vfio_device_container_unregister(struct vfio_device *device);
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int vfio_device_container_pin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage,
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int prot, struct page **pages);
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void vfio_device_container_unpin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage);
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int vfio_device_container_dma_rw(struct vfio_device *device,
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dma_addr_t iova, void *data,
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size_t len, bool write);
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int __init vfio_container_init(void);
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void vfio_container_cleanup(void);
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#else
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static inline struct vfio_container *
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vfio_container_from_file(struct file *filep)
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{
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return NULL;
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}
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static inline int vfio_group_use_container(struct vfio_group *group)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_group_unuse_container(struct vfio_group *group)
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{
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}
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static inline int vfio_container_attach_group(struct vfio_container *container,
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struct vfio_group *group)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_group_detach_container(struct vfio_group *group)
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{
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}
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static inline void vfio_device_container_register(struct vfio_device *device)
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{
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}
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static inline void vfio_device_container_unregister(struct vfio_device *device)
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{
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}
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static inline int vfio_device_container_pin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage,
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int prot, struct page **pages)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_device_container_unpin_pages(struct vfio_device *device,
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dma_addr_t iova, int npage)
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{
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}
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static inline int vfio_device_container_dma_rw(struct vfio_device *device,
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dma_addr_t iova, void *data,
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size_t len, bool write)
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{
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return -EOPNOTSUPP;
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}
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static inline int vfio_container_init(void)
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{
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return 0;
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}
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static inline void vfio_container_cleanup(void)
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{
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}
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#endif
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#if IS_ENABLED(CONFIG_IOMMUFD)
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bool vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
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struct iommufd_ctx *ictx);
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int vfio_df_iommufd_bind(struct vfio_device_file *df);
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void vfio_df_iommufd_unbind(struct vfio_device_file *df);
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int vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
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struct iommufd_ctx *ictx);
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#else
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static inline bool
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vfio_iommufd_device_has_compat_ioas(struct vfio_device *vdev,
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struct iommufd_ctx *ictx)
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{
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return false;
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}
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static inline int vfio_df_iommufd_bind(struct vfio_device_file *fd)
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{
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return -EOPNOTSUPP;
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}
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static inline void vfio_df_iommufd_unbind(struct vfio_device_file *df)
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{
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}
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static inline int
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vfio_iommufd_compat_attach_ioas(struct vfio_device *device,
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struct iommufd_ctx *ictx)
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{
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return -EOPNOTSUPP;
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}
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#endif
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int vfio_df_ioctl_attach_pt(struct vfio_device_file *df,
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struct vfio_device_attach_iommufd_pt __user *arg);
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int vfio_df_ioctl_detach_pt(struct vfio_device_file *df,
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struct vfio_device_detach_iommufd_pt __user *arg);
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#if IS_ENABLED(CONFIG_VFIO_DEVICE_CDEV)
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void vfio_init_device_cdev(struct vfio_device *device);
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static inline int vfio_device_add(struct vfio_device *device)
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{
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/* cdev does not support noiommu device */
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if (vfio_device_is_noiommu(device))
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return device_add(&device->device);
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vfio_init_device_cdev(device);
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return cdev_device_add(&device->cdev, &device->device);
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}
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static inline void vfio_device_del(struct vfio_device *device)
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{
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if (vfio_device_is_noiommu(device))
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device_del(&device->device);
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else
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cdev_device_del(&device->cdev, &device->device);
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}
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int vfio_device_fops_cdev_open(struct inode *inode, struct file *filep);
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long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
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struct vfio_device_bind_iommufd __user *arg);
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void vfio_df_unbind_iommufd(struct vfio_device_file *df);
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int vfio_cdev_init(struct class *device_class);
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void vfio_cdev_cleanup(void);
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#else
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static inline void vfio_init_device_cdev(struct vfio_device *device)
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{
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}
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static inline int vfio_device_add(struct vfio_device *device)
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{
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return device_add(&device->device);
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}
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static inline void vfio_device_del(struct vfio_device *device)
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{
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device_del(&device->device);
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}
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static inline int vfio_device_fops_cdev_open(struct inode *inode,
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struct file *filep)
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{
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return 0;
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}
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static inline long vfio_df_ioctl_bind_iommufd(struct vfio_device_file *df,
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struct vfio_device_bind_iommufd __user *arg)
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{
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return -ENOTTY;
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}
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static inline void vfio_df_unbind_iommufd(struct vfio_device_file *df)
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{
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}
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static inline int vfio_cdev_init(struct class *device_class)
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{
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return 0;
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}
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static inline void vfio_cdev_cleanup(void)
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{
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}
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#endif /* CONFIG_VFIO_DEVICE_CDEV */
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#if IS_ENABLED(CONFIG_VFIO_VIRQFD)
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int __init vfio_virqfd_init(void);
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void vfio_virqfd_exit(void);
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#else
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static inline int __init vfio_virqfd_init(void)
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{
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return 0;
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}
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static inline void vfio_virqfd_exit(void)
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{
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}
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#endif
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#ifdef CONFIG_HAVE_KVM
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void vfio_device_get_kvm_safe(struct vfio_device *device, struct kvm *kvm);
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void vfio_device_put_kvm(struct vfio_device *device);
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#else
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static inline void vfio_device_get_kvm_safe(struct vfio_device *device,
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struct kvm *kvm)
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{
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}
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static inline void vfio_device_put_kvm(struct vfio_device *device)
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{
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}
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#endif
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#ifdef CONFIG_VFIO_DEBUGFS
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void vfio_debugfs_create_root(void);
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void vfio_debugfs_remove_root(void);
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void vfio_device_debugfs_init(struct vfio_device *vdev);
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void vfio_device_debugfs_exit(struct vfio_device *vdev);
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#else
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static inline void vfio_debugfs_create_root(void) { }
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static inline void vfio_debugfs_remove_root(void) { }
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static inline void vfio_device_debugfs_init(struct vfio_device *vdev) { }
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static inline void vfio_device_debugfs_exit(struct vfio_device *vdev) { }
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#endif /* CONFIG_VFIO_DEBUGFS */
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#endif
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