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TOMOYO Linux Cross Reference
Linux/include/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, 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__ */
 77 

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