x86/loader: add -shim option

Add new -shim command line option, wire up for the x86 loader.
When specified load shim into the new "etc/boot/shim" fw_cfg file.

Needs OVMF changes too to be actually useful.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20240905141211.1253307-6-kraxel@redhat.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/hw/core/machine.c b/hw/core/machine.c
index e6900b43ef..d970f753e3 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -305,6 +305,21 @@ static void machine_set_kernel(Object *obj, const char *value, Error **errp)
     ms->kernel_filename = g_strdup(value);
 }
 
+static char *machine_get_shim(Object *obj, Error **errp)
+{
+    MachineState *ms = MACHINE(obj);
+
+    return g_strdup(ms->shim_filename);
+}
+
+static void machine_set_shim(Object *obj, const char *value, Error **errp)
+{
+    MachineState *ms = MACHINE(obj);
+
+    g_free(ms->shim_filename);
+    ms->shim_filename = g_strdup(value);
+}
+
 static char *machine_get_initrd(Object *obj, Error **errp)
 {
     MachineState *ms = MACHINE(obj);
@@ -1082,6 +1097,11 @@ static void machine_class_init(ObjectClass *oc, void *data)
     object_class_property_set_description(oc, "kernel",
         "Linux kernel image file");
 
+    object_class_property_add_str(oc, "shim",
+        machine_get_shim, machine_set_shim);
+    object_class_property_set_description(oc, "shim",
+        "shim.efi file");
+
     object_class_property_add_str(oc, "initrd",
         machine_get_initrd, machine_set_initrd);
     object_class_property_set_description(oc, "initrd",