[PATCH v9 4/4] xen: enable dom0less guests to use console_io hypercalls

[Stefano Stabellini <stefano.stabellini@xxxxxxx>]

Enable dom0less guests on ARM to use console_io hypercalls:
- set input_allow = true for dom0less domains
- update the in-code comment in console.c
- prioritize the VUART check to retain the same behavior as today

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxx>
---
 xen/common/device-tree/dom0less-build.c |  2 ++
 xen/drivers/char/console.c              | 16 ++++++++++------
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/xen/common/device-tree/dom0less-build.c 
b/xen/common/device-tree/dom0less-build.c
index 840d14419d..cb7026fa7e 100644
--- a/xen/common/device-tree/dom0less-build.c
+++ b/xen/common/device-tree/dom0less-build.c
@@ -829,6 +829,8 @@ static int __init construct_domU(struct kernel_info *kinfo,
 
     rangeset_destroy(kinfo->xen_reg_assigned);
 
+    d->console->input_allowed = true;
+
     return rc;
 }
 
diff --git a/xen/drivers/char/console.c b/xen/drivers/char/console.c
index b59ebdeddb..7afe9cfd41 100644
--- a/xen/drivers/char/console.c
+++ b/xen/drivers/char/console.c
@@ -610,11 +610,20 @@ static void __serial_rx(char c)
     if ( ACCESS_ONCE(console_rx) == 0 )
         return handle_keypress(c, false);
 
+    /* Includes an is_focus_domain() check. */
     d = console_get_domain();
     if ( !d )
         return;
 
-    if ( is_hardware_domain(d) )
+#ifdef CONFIG_SBSA_VUART_CONSOLE
+    /* Prioritize vpl011 if enabled for this domain */
+    if ( d->arch.vpl011.base_addr )
+    {
+        /* Deliver input to the emulated UART. */
+        rc = vpl011_rx_char_xen(d, c);
+    }
+    else
+#endif
     {
         unsigned long flags;
 
@@ -633,11 +642,6 @@ static void __serial_rx(char c)
          */
         send_guest_domain_virq(d, VIRQ_CONSOLE);
     }
-#ifdef CONFIG_SBSA_VUART_CONSOLE
-    else
-        /* Deliver input to the emulated UART. */
-        rc = vpl011_rx_char_xen(d, c);
-#endif
 
     if ( consoled_is_enabled() )
         /* Deliver input to the PV shim console. */
-- 
2.25.1