summaryrefslogtreecommitdiff
path: root/virt/kvm/iodev.h
diff options
context:
space:
mode:
Diffstat (limited to 'virt/kvm/iodev.h')
-rw-r--r--virt/kvm/iodev.h55
1 files changed, 30 insertions, 25 deletions
diff --git a/virt/kvm/iodev.h b/virt/kvm/iodev.h
index 55e8846ac3a6..12fd3caffd2b 100644
--- a/virt/kvm/iodev.h
+++ b/virt/kvm/iodev.h
@@ -17,49 +17,54 @@
#define __KVM_IODEV_H__
#include <linux/kvm_types.h>
+#include <asm/errno.h>
-struct kvm_io_device {
- void (*read)(struct kvm_io_device *this,
+struct kvm_io_device;
+
+/**
+ * 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_io_device *this,
+ gpa_t addr,
+ int len,
+ void *val);
+ int (*write)(struct kvm_io_device *this,
gpa_t addr,
int len,
- void *val);
- void (*write)(struct kvm_io_device *this,
- gpa_t addr,
- int len,
- const void *val);
- int (*in_range)(struct kvm_io_device *this, gpa_t addr, int len,
- int is_write);
+ const void *val);
void (*destructor)(struct kvm_io_device *this);
+};
- void *private;
+
+struct kvm_io_device {
+ const struct kvm_io_device_ops *ops;
};
-static inline void kvm_iodevice_read(struct kvm_io_device *dev,
- gpa_t addr,
- int len,
- void *val)
+static inline void kvm_iodevice_init(struct kvm_io_device *dev,
+ const struct kvm_io_device_ops *ops)
{
- dev->read(dev, addr, len, val);
+ dev->ops = ops;
}
-static inline void kvm_iodevice_write(struct kvm_io_device *dev,
- gpa_t addr,
- int len,
- const void *val)
+static inline int kvm_iodevice_read(struct kvm_io_device *dev,
+ gpa_t addr, int l, void *v)
{
- dev->write(dev, addr, len, val);
+ return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP;
}
-static inline int kvm_iodevice_inrange(struct kvm_io_device *dev,
- gpa_t addr, int len, int is_write)
+static inline int kvm_iodevice_write(struct kvm_io_device *dev,
+ gpa_t addr, int l, const void *v)
{
- return dev->in_range(dev, addr, len, is_write);
+ return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP;
}
static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
{
- if (dev->destructor)
- dev->destructor(dev);
+ if (dev->ops->destructor)
+ dev->ops->destructor(dev);
}
#endif /* __KVM_IODEV_H__ */