/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef __KVM_IODEV_H__#define __KVM_IODEV_H__ #include <linux/kvm_types.h>#include <linux/errno.h> struct kvm_io_device;struct kvm_vcpu; /** * kvm_io_device_ops are called under kvm slots_lock. * read and write handlers return 0 if the transaction has been handled, * or non-zero to have it passed to the next device. **/struct kvm_io_device_ops {	int (*read)(struct kvm_vcpu *vcpu,		    struct kvm_io_device *this,		    gpa_t addr,		    int len,		    void *val);	int (*write)(struct kvm_vcpu *vcpu,		     struct kvm_io_device *this,		     gpa_t addr,		     int len,		     const void *val);	void (*destructor)(struct kvm_io_device *this);};  struct kvm_io_device {	const struct kvm_io_device_ops *ops;}; static inline void kvm_iodevice_init(struct kvm_io_device *dev,				     const struct kvm_io_device_ops *ops){	dev->ops = ops;} static inline int kvm_iodevice_read(struct kvm_vcpu *vcpu,				    struct kvm_io_device *dev, gpa_t addr,				    int l, void *v){	return dev->ops->read ? dev->ops->read(vcpu, dev, addr, l, v)				: -EOPNOTSUPP;} static inline int kvm_iodevice_write(struct kvm_vcpu *vcpu,				     struct kvm_io_device *dev, gpa_t addr,				     int l, const void *v){	return dev->ops->write ? dev->ops->write(vcpu, dev, addr, l, v)				 : -EOPNOTSUPP;} #endif /* __KVM_IODEV_H__ */