1/* SPDX-License-Identifier: GPL-2.0-only */
2
3#ifndef __KVM_IODEV_H__
4#define __KVM_IODEV_H__
5
6#include <linux/kvm_types.h>
7#include <linux/errno.h>
8
9struct kvm_io_device;
10struct kvm_vcpu;
11
12/**
13 * kvm_io_device_ops are called under kvm slots_lock.
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.
16 **/
17struct kvm_io_device_ops {
18 int (*read)(struct kvm_vcpu *vcpu,
19 struct kvm_io_device *this,
20 gpa_t addr,
21 int len,
22 void *val);
23 int (*write)(struct kvm_vcpu *vcpu,
24 struct kvm_io_device *this,
25 gpa_t addr,
26 int len,
27 const void *val);
28 void (*destructor)(struct kvm_io_device *this);
29};
30
31
32struct kvm_io_device {
33 const struct kvm_io_device_ops *ops;
34};
35
36static 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
42static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,
43 struct kvm_io_device *dev, gpa_t addr,
44 int l, void *v)
45{
46 return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
47 : -EOPNOTSUPP;
48}
49
50static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
51 struct kvm_io_device *dev, gpa_t addr,
52 int l, const void *v)
53{
54 return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
55 : -EOPNOTSUPP;
56}
57
58#endif /* __KVM_IODEV_H__ */
59

source code of linux/include/kvm/iodev.h