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