1 files changed, 100 insertions, 0 deletions
diff --git a/include/hw/xen/xen_backend_ops.h b/include/hw/xen/xen_backend_ops.h
index 9605456e81..bb3333ab00 100644
--- a/include/hw/xen/xen_backend_ops.h
+++ b/include/hw/xen/xen_backend_ops.h
@@ -29,6 +29,12 @@
 typedef struct xenevtchn_handle xenevtchn_handle;
 typedef int xenevtchn_port_or_error_t;
 typedef uint32_t evtchn_port_t;
+typedef uint16_t domid_t;
+typedef uint32_t grant_ref_t;
+
+#define XEN_PAGE_SHIFT       12
+#define XEN_PAGE_SIZE        (1UL << XEN_PAGE_SHIFT)
+#define XEN_PAGE_MASK        (~(XEN_PAGE_SIZE - 1))
 
 struct evtchn_backend_ops {
     xenevtchn_handle *(*open)(void);
@@ -113,6 +119,100 @@ static inline int qemu_xen_evtchn_pending(xenevtchn_handle *xc)
     return xen_evtchn_ops->pending(xc);
 }
 
+typedef struct xengntdev_handle xengnttab_handle;
+
+typedef struct XenGrantCopySegment {
+    union {
+        void *virt;
+        struct {
+            uint32_t ref;
+            off_t offset;
+        } foreign;
+    } source, dest;
+    size_t len;
+} XenGrantCopySegment;
+
+#define XEN_GNTTAB_OP_FEATURE_MAP_MULTIPLE  (1U << 0)
+
+struct gnttab_backend_ops {
+    uint32_t features;
+    xengnttab_handle *(*open)(void);
+    int (*close)(xengnttab_handle *xgt);
+    int (*grant_copy)(xengnttab_handle *xgt, bool to_domain, uint32_t domid,
+                      XenGrantCopySegment *segs, uint32_t nr_segs,
+                      Error **errp);
+    int (*set_max_grants)(xengnttab_handle *xgt, uint32_t nr_grants);
+    void *(*map_refs)(xengnttab_handle *xgt, uint32_t count, uint32_t domid,
+                      uint32_t *refs, int prot);
+    int (*unmap)(xengnttab_handle *xgt, void *start_address, uint32_t count);
+};
+
+extern struct gnttab_backend_ops *xen_gnttab_ops;
+
+static inline bool qemu_xen_gnttab_can_map_multi(void)
+{
+    return xen_gnttab_ops &&
+        !!(xen_gnttab_ops->features & XEN_GNTTAB_OP_FEATURE_MAP_MULTIPLE);
+}
+
+static inline xengnttab_handle *qemu_xen_gnttab_open(void)
+{
+    if (!xen_gnttab_ops) {
+        return NULL;
+    }
+    return xen_gnttab_ops->open();
+}
+
+static inline int qemu_xen_gnttab_close(xengnttab_handle *xgt)
+{
+    if (!xen_gnttab_ops) {
+        return -ENOSYS;
+    }
+    return xen_gnttab_ops->close(xgt);
+}
+
+static inline int qemu_xen_gnttab_grant_copy(xengnttab_handle *xgt,
+                                             bool to_domain, uint32_t domid,
+                                             XenGrantCopySegment *segs,
+                                             uint32_t nr_segs, Error **errp)
+{
+    if (!xen_gnttab_ops) {
+        return -ENOSYS;
+    }
+
+    return xen_gnttab_ops->grant_copy(xgt, to_domain, domid, segs, nr_segs,
+                                      errp);
+}
+
+static inline int qemu_xen_gnttab_set_max_grants(xengnttab_handle *xgt,
+                                                 uint32_t nr_grants)
+{
+    if (!xen_gnttab_ops) {
+        return -ENOSYS;
+    }
+    return xen_gnttab_ops->set_max_grants(xgt, nr_grants);
+}
+
+static inline void *qemu_xen_gnttab_map_refs(xengnttab_handle *xgt,
+                                             uint32_t count, uint32_t domid,
+                                             uint32_t *refs, int prot)
+{
+    if (!xen_gnttab_ops) {
+        return NULL;
+    }
+    return xen_gnttab_ops->map_refs(xgt, count, domid, refs, prot);
+}
+
+static inline int qemu_xen_gnttab_unmap(xengnttab_handle *xgt,
+                                        void *start_address,
+                                        uint32_t count)
+{
+    if (!xen_gnttab_ops) {
+        return -ENOSYS;
+    }
+    return xen_gnttab_ops->unmap(xgt, start_address, count);
+}
+
 void setup_xen_backend_ops(void);
 
 #endif /* QEMU_XEN_BACKEND_OPS_H */