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1 | /* | |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
13 | */ | |
14 | ||
15 | #ifndef __KVM_IODEV_H__ | |
16 | #define __KVM_IODEV_H__ | |
17 | ||
18 | #include <linux/kvm_types.h> | |
19 | #include <linux/errno.h> | |
20 | ||
21 | struct kvm_io_device; | |
22 | struct kvm_vcpu; | |
23 | ||
24 | /** | |
25 | * kvm_io_device_ops are called under kvm slots_lock. | |
26 | * read and write handlers return 0 if the transaction has been handled, | |
27 | * or non-zero to have it passed to the next device. | |
28 | **/ | |
29 | struct kvm_io_device_ops { | |
30 | int (*read)(struct kvm_vcpu *vcpu, | |
31 | struct kvm_io_device *this, | |
32 | gpa_t addr, | |
33 | int len, | |
34 | void *val); | |
35 | int (*write)(struct kvm_vcpu *vcpu, | |
36 | struct kvm_io_device *this, | |
37 | gpa_t addr, | |
38 | int len, | |
39 | const void *val); | |
40 | void (*destructor)(struct kvm_io_device *this); | |
41 | }; | |
42 | ||
43 | ||
44 | struct kvm_io_device { | |
45 | const struct kvm_io_device_ops *ops; | |
46 | }; | |
47 | ||
48 | static inline void kvm_iodevice_init(struct kvm_io_device *dev, | |
49 | const struct kvm_io_device_ops *ops) | |
50 | { | |
51 | dev->ops = ops; | |
52 | } | |
53 | ||
54 | static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu, | |
55 | struct kvm_io_device *dev, gpa_t addr, | |
56 | int l, void *v) | |
57 | { | |
58 | return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v) | |
59 | : -EOPNOTSUPP; | |
60 | } | |
61 | ||
62 | static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu, | |
63 | struct kvm_io_device *dev, gpa_t addr, | |
64 | int l, const void *v) | |
65 | { | |
66 | return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v) | |
67 | : -EOPNOTSUPP; | |
68 | } | |
69 | ||
70 | static inline void kvm_iodevice_destructor(struct kvm_io_device *dev) | |
71 | { | |
72 | if (dev->ops->destructor) | |
73 | dev->ops->destructor(dev); | |
74 | } | |
75 | ||
76 | #endif /* __KVM_IODEV_H__ */ |