]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blame - virt/kvm/iodev.h
KVM: Redesign kvm_io_bus_ API to pass VCPU structure to the callbacks.
[mirror_ubuntu-bionic-kernel.git] / virt / kvm / iodev.h
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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, write to the Free Software
13 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
14 */
15
16#ifndef __KVM_IODEV_H__
17#define __KVM_IODEV_H__
18
edf88417 19#include <linux/kvm_types.h>
bda9020e 20#include <asm/errno.h>
e2174021 21
d76685c4 22struct kvm_io_device;
e32edf4f 23struct kvm_vcpu;
d76685c4 24
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25/**
26 * kvm_io_device_ops are called under kvm slots_lock.
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27 * read and write handlers return 0 if the transaction has been handled,
28 * or non-zero to have it passed to the next device.
69fa2d78 29 **/
d76685c4 30struct kvm_io_device_ops {
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31 int (*read)(struct kvm_vcpu *vcpu,
32 struct kvm_io_device *this,
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33 gpa_t addr,
34 int len,
35 void *val);
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36 int (*write)(struct kvm_vcpu *vcpu,
37 struct kvm_io_device *this,
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38 gpa_t addr,
39 int len,
bda9020e 40 const void *val);
e2174021 41 void (*destructor)(struct kvm_io_device *this);
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42};
43
e2174021 44
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45struct kvm_io_device {
46 const struct kvm_io_device_ops *ops;
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47};
48
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49static inline void kvm_iodevice_init(struct kvm_io_device *dev,
50 const struct kvm_io_device_ops *ops)
51{
52 dev->ops = ops;
53}
54
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55static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,
56 struct kvm_io_device *dev, gpa_t addr,
57 int l, void *v)
e2174021 58{
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59 return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)
60 : -EOPNOTSUPP;
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61}
62
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63static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,
64 struct kvm_io_device *dev, gpa_t addr,
65 int l, const void *v)
e2174021 66{
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67 return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)
68 : -EOPNOTSUPP;
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69}
70
71static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
72{
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73 if (dev->ops->destructor)
74 dev->ops->destructor(dev);
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75}
76
77#endif /* __KVM_IODEV_H__ */