xen: convert "-machine igd-passthru" to an accelerator property

The first machine property to fall is Xen's Intel integrated graphics
passthrough.  The "-machine igd-passthru" option does not set anymore
a property on the machine object, but desugars to a GlobalProperty on
accelerator objects.

The setter is very simple, since the value ends up in a
global variable, so this patch also provides an example before the more
complicated cases that follow it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 4 insertions, 10 deletions

diff --git a/vl.c b/vl.c
index 900f97a36a..774305c3f7 100644
--- a/vl.c
+++ b/vl.c
@@ -1133,13 +1133,6 @@ static void configure_msg(QemuOpts *opts)
 }
 
 
-/* Now we still need this for compatibility with XEN. */
-bool has_igd_gfx_passthru;
-static void igd_gfx_passthru(void)
-{
-    has_igd_gfx_passthru = current_machine->igd_gfx_passthru;
-}
-
 /***********************************************************/
 /* USB devices */
 
@@ -2517,6 +2510,10 @@ static int machine_set_property(void *opaque,
     if (g_str_equal(qom_name, "accel")) {
         return 0;
     }
+    if (g_str_equal(qom_name, "igd-passthru")) {
+        object_register_sugar_prop(ACCEL_CLASS_NAME("xen"), qom_name, value);
+        return 0;
+    }
 
     return object_parse_property_opt(opaque, name, value, "type", errp);
 }
@@ -4297,9 +4294,6 @@ int main(int argc, char **argv, char **envp)
             exit(1);
     }
 
-    /* Check if IGD GFX passthrough. */
-    igd_gfx_passthru();
-
     /* init generic devices */
     rom_set_order_override(FW_CFG_ORDER_OVERRIDE_DEVICE);
     qemu_opts_foreach(qemu_find_opts("device"),