projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5dfa3c2f | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| e2174021 HB |
2 | |
| 3 | #ifndef __KVM_IODEV_H__ | |
| 4 | #define __KVM_IODEV_H__ | |
| 5 | ||
| edf88417 | 6 | #include <linux/kvm_types.h> |
| af669ac6 | 7 | #include <linux/errno.h> |
| e2174021 | 8 | |
| d76685c4 | 9 | struct kvm_io_device; |
| e32edf4f | 10 | struct kvm_vcpu; |
| d76685c4 | 11 | |
| 69fa2d78 MT |
12 | /** |
| 13 | * kvm_io_device_ops are called under kvm slots_lock. | |
| bda9020e MT |
14 | * read and write handlers return 0 if the transaction has been handled, |
| 15 | * or non-zero to have it passed to the next device. | |
| 69fa2d78 | 16 | **/ |
| d76685c4 | 17 | struct kvm_io_device_ops { |
| e32edf4f NN |
18 | int (*read)(struct kvm_vcpu *vcpu, |
| 19 | struct kvm_io_device *this, | |
| bda9020e MT |
20 | gpa_t addr, |
| 21 | int len, | |
| 22 | void *val); | |
| e32edf4f NN |
23 | int (*write)(struct kvm_vcpu *vcpu, |
| 24 | struct kvm_io_device *this, | |
| e2174021 HB |
25 | gpa_t addr, |
| 26 | int len, | |
| bda9020e | 27 | const void *val); |
| e2174021 | 28 | void (*destructor)(struct kvm_io_device *this); |
| d76685c4 GH |
29 | }; |
| 30 | ||
| e2174021 | 31 | |
| d76685c4 GH |
32 | struct kvm_io_device { |
| 33 | const struct kvm_io_device_ops *ops; | |
| e2174021 HB |
34 | }; |
| 35 | ||
| d76685c4 GH |
36 | static inline void kvm_iodevice_init(struct kvm_io_device *dev, |
| 37 | const struct kvm_io_device_ops *ops) | |
| 38 | { | |
| 39 | dev->ops = ops; | |
| 40 | } | |
| 41 | ||
| e32edf4f NN |
42 | static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu, |
| 43 | struct kvm_io_device *dev, gpa_t addr, | |
| 44 | int l, void *v) | |
| e2174021 | 45 | { |
| e32edf4f NN |
46 | return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v) |
| 47 | : -EOPNOTSUPP; | |
| e2174021 HB |
48 | } |
| 49 | ||
| e32edf4f NN |
50 | static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu, |
| 51 | struct kvm_io_device *dev, gpa_t addr, | |
| 52 | int l, const void *v) | |
| e2174021 | 53 | { |
| e32edf4f NN |
54 | return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v) |
| 55 | : -EOPNOTSUPP; | |
| e2174021 HB |
56 | } |
| 57 | ||
| 58 | static inline void kvm_iodevice_destructor(struct kvm_io_device *dev) | |
| 59 | { | |
| d76685c4 GH |
60 | if (dev->ops->destructor) |
| 61 | dev->ops->destructor(dev); | |
| e2174021 HB |
62 | } |
| 63 | ||
| 64 | #endif /* __KVM_IODEV_H__ */ |