KVM: Adds support for in-kernel mmio handlers

Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h
index b08272bce213..31846b1c162f 100644
--- a/drivers/kvm/kvm.h
+++ b/drivers/kvm/kvm.h
@@ -265,6 +265,65 @@ struct kvm_stat {
         u32 efer_reload;
 };
 
+struct kvm_io_device {
+        void (*read)(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);
+        void (*destructor)(struct kvm_io_device *this);
+
+        void             *private;
+};
+
+static inline void kvm_iodevice_read(struct kvm_io_device *dev,
+                                     gpa_t addr,
+                                     int len,
+                                     void *val)
+{
+        dev->read(dev, addr, len, val);
+}
+
+static inline void kvm_iodevice_write(struct kvm_io_device *dev,
+                                      gpa_t addr,
+                                      int len,
+                                      const void *val)
+{
+        dev->write(dev, addr, len, val);
+}
+
+static inline int kvm_iodevice_inrange(struct kvm_io_device *dev, gpa_t addr)
+{
+        return dev->in_range(dev, addr);
+}
+
+static inline void kvm_iodevice_destructor(struct kvm_io_device *dev)
+{
+        dev->destructor(dev);
+}
+
+/*
+ * It would be nice to use something smarter than a linear search, TBD...
+ * Thankfully we dont expect many devices to register (famous last words :),
+ * so until then it will suffice.  At least its abstracted so we can change
+ * in one place.
+ */
+struct kvm_io_bus {
+        int                   dev_count;
+#define NR_IOBUS_DEVS 6
+        struct kvm_io_device *devs[NR_IOBUS_DEVS];
+};
+
+void kvm_io_bus_init(struct kvm_io_bus *bus);
+void kvm_io_bus_destroy(struct kvm_io_bus *bus);
+struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr);
+void kvm_io_bus_register_dev(struct kvm_io_bus *bus,
+                             struct kvm_io_device *dev);
+
 struct kvm_vcpu {
         struct kvm *kvm;
         union {
@@ -393,6 +452,7 @@ struct kvm {
         unsigned long rmap_overflow;
         struct list_head vm_list;
         struct file *filp;
+        struct kvm_io_bus mmio_bus;
 };
 
 struct descriptor_table {