igvm: add support for igvm memory map parameter in native mode

Add and wire up qigvm_x86_get_mem_map_entry function which converts the
e820 table into an igvm memory map parameter.  This makes igvm files for
the native (non-confidential) platform with memory map parameter work.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Luigi Leonardi <leonardi@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20251029105555.2492276-4-kraxel@redhat.com>

stubs/igvm.c

@@ -0,0 +1,21 @@
+/*
+ * QEMU IGVM, stubs
+ *
+ * Copyright (C) 2026 Red Hat
+ *
+ * Authors:
+ *  Gerd Hoffmann <kraxel@redhat.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "qemu/osdep.h"
+
+#include "system/igvm.h"
+
+int qigvm_x86_get_mem_map_entry(int index,
+                                ConfidentialGuestMemoryMapEntry *entry,
+                                Error **errp)
+{
+    return -1;
+}

stubs/meson.build

@@ -74,6 +74,7 @@ if have_system
   stub_ss.add(files('dump.c'))
   stub_ss.add(files('cmos.c'))
   stub_ss.add(files('fw_cfg.c'))
+  stub_ss.add(files('igvm.c'))
   stub_ss.add(files('target-get-monitor-def.c'))
   stub_ss.add(files('target-monitor-defs.c'))
   stub_ss.add(files('win32-kbd-hook.c'))