[Xen-devel] qemu-xen: add vkbd support for PV on HVM guests

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

Register the vkbd backend even when running as device emulator for HVM
guests: it is useful because it doesn't need a frequent timer like usb.

Check whether the XenInput DisplayState has been set in the initialise
state, rather than the input state.
In case the DisplayState hasn't been set and there is no vfb for this
domain, then set the XenInput DisplayState to the default one.

An equivalent patch has already been committed in upstream qemu.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---

diff --git a/hw/xen_machine_fv.c b/hw/xen_machine_fv.c
index 603a508..fdad42a 100644
--- a/hw/xen_machine_fv.c
+++ b/hw/xen_machine_fv.c
@@ -368,6 +368,7 @@ static void xen_init_fv(ram_addr_t ram_size, int 
vga_ram_size,
         exit(1);
     }
     xen_be_register("console", &xen_console_ops);
+    xen_be_register("vkbd", &xen_kbdmouse_ops);
 #ifndef CONFIG_STUBDOM
     xen_be_register("qdisk", &xen_blkdev_ops);
 #endif
diff --git a/hw/xenfb.c b/hw/xenfb.c
index 05c51cc..96c2a6f 100644
--- a/hw/xenfb.c
+++ b/hw/xenfb.c
@@ -350,13 +350,6 @@ static void xenfb_mouse_event(void *opaque,
 
 static int input_init(struct XenDevice *xendev)
 {
-    struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
-
-    if (!in->c.ds) {
-        xen_be_printf(xendev, 1, "ds not set (yet)\n");
-       return -1;
-    }
-
     xenstore_write_be_int(xendev, "feature-abs-pointer", 1);
     return 0;
 }
@@ -366,6 +359,18 @@ static int input_initialise(struct XenDevice *xendev)
     struct XenInput *in = container_of(xendev, struct XenInput, c.xendev);
     int rc;
 
+    if (!in->c.ds) {
+        char *vfb = xenstore_read_str(NULL, "device/vfb");
+        if (vfb == NULL) {
+            /* there is no vfb, run vkbd on its own */
+            in->c.ds = get_displaystate();
+        } else {
+            free(vfb);
+            xen_be_printf(xendev, 1, "ds not set (yet)\n");
+            return -1;
+        }
+    }
+
     rc = common_bind(&in->c);
     if (rc != 0)
        return rc;

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