diff -r 4553bc1087d9 tools/ioemu/hw/xenfb.c
--- a/tools/ioemu/hw/xenfb.c	Wed Dec 12 15:41:20 2007 +0000
+++ b/tools/ioemu/hw/xenfb.c	Tue Dec 18 10:17:37 2007 -0700
@@ -267,6 +267,9 @@ struct xenfb *xenfb_new(int domid, Displ
 
 	fprintf(stderr, "FB: Waiting for KBD backend creation\n");
 	xenfb_wait_for_backend(&xenfb->kbd, xenfb_backend_created_kbd);
+
+	/* Indicate we have the frame buffer resize feature */
+	xenfb_xs_printf(xenfb->xsh, xenfb->fb.nodename, "feature-resize", "1");
 
 	return xenfb;
 
@@ -510,6 +513,13 @@ static void xenfb_on_fb_event(struct xen
 			}
 			xenfb_guest_copy(xenfb, x, y, w, h);
 			break;
+		case XENFB_TYPE_RESIZE:
+			w = event->resize.width;
+			h = event->resize.height;
+			xenfb->width = w;
+			xenfb->height = h;
+			dpy_resize(xenfb->ds, xenfb->width, xenfb->height);
+			break;
 		}
 	}
 	mb();			/* ensure we're done with ring contents */
diff -r 4553bc1087d9 xen/include/public/io/fbif.h
--- a/xen/include/public/io/fbif.h	Wed Dec 12 15:41:20 2007 +0000
+++ b/xen/include/public/io/fbif.h	Thu Dec 13 04:16:46 2007 -0700
@@ -50,12 +50,26 @@ struct xenfb_update
     int32_t height; /* rect height */
 };
 
+/*
+ * Framebuffer resize notification event
+ * Capable backend sets feature-resize in xenstore.
+ */
+#define XENFB_TYPE_RESIZE 3
+
+struct xenfb_resize
+{
+    uint8_t type;    /* XENFB_TYPE_RESIZE */
+    int32_t width;   /* xres */
+    int32_t height;  /* yres */
+};
+
 #define XENFB_OUT_EVENT_SIZE 40
 
 union xenfb_out_event
 {
     uint8_t type;
     struct xenfb_update update;
+    struct xenfb_resize resize;
     char pad[XENFB_OUT_EVENT_SIZE];
 };