From: "Jose R. Ziviani" <jziviani@suse.de>
Date: Thu, 16 Sep 2021 00:52:34 -0300
Subject: modules: quick-fix a fundamental error in modules

Signed-off-by: Jose R. Ziviani <jziviani@suse.de>
---
 include/qemu/module.h |  1 +
 util/module.c         | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/qemu/module.h b/include/qemu/module.h
index 3deac0078b9d4d62d0549427b7ec..49d46532000e8c7211d43f7b705c 100644
--- a/include/qemu/module.h
+++ b/include/qemu/module.h
@@ -73,6 +73,7 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail);
 void module_load_qom_one(const char *type);
 void module_load_qom_all(void);
 void module_allow_arch(const char *arch);
+bool s390x_blocklist(const char *name);
 
 /**
  * DOC: module info annotation macros
diff --git a/util/module.c b/util/module.c
index 6bb4ad915a1c86f1601a4913a29c..485c137c79e9d4e45c4708bb8017 100644
--- a/util/module.c
+++ b/util/module.c
@@ -119,6 +119,28 @@ static const QemuModinfo module_info_stub[] = { {
 static const QemuModinfo *module_info = module_info_stub;
 static const char *module_arch;
 
+bool s390x_blocklist(const char *name)
+{
+    const char *blocklist[] = {
+        "hw-display-qxl",
+        "hw-display-virtio-vga",
+        "hw-display-virtio-vga-gl",
+        "hw-usb-host",
+        "hw-usb-redirect",
+        "hw-usb-smartcard"
+    };
+
+    const size_t len = sizeof(blocklist) / sizeof(blocklist[0]);
+
+    for (size_t i = 0; i < len; i++) {
+        if (strcmp(blocklist[i], name) == 0) {
+            return true;
+        }
+    }
+
+    return false;
+}
+
 void module_init_info(const QemuModinfo *info)
 {
     module_info = info;
@@ -131,6 +153,10 @@ void module_allow_arch(const char *arch)
 
 static bool module_check_arch(const QemuModinfo *modinfo)
 {
+    if (modinfo->name && s390x_blocklist(modinfo->name)) {
+        return false;
+    }
+
     if (modinfo->arch) {
         if (!module_arch) {
             /* no arch set -> ignore all */