[PATCH v2 13/18] modules: load modinfo.json

[Gerd Hoffmann]

Load and parse the module info database.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 util/module.c     | 54 +++++++++++++++++++++++++++++++++++++++++++++++
 util/trace-events |  3 +++
 2 files changed, 57 insertions(+)

diff --git a/util/module.c b/util/module.c
index 3a2d6dde9734..b0ea8c57d438 100644
--- a/util/module.c
+++ b/util/module.c
@@ -20,9 +20,16 @@
 #include "qemu/queue.h"
 #include "qemu/module.h"
 #include "qemu/cutils.h"
+#include "qemu/error-report.h"
 #ifdef CONFIG_MODULE_UPGRADES
 #include "qemu-version.h"
 #endif
+#include "trace.h"
+
+#include "qapi/error.h"
+#include "qapi/qapi-types-modules.h"
+#include "qapi/qapi-visit-modules.h"
+#include "qapi/qobject-input-visitor.h"
 
 typedef struct ModuleEntry
 {
@@ -111,6 +118,7 @@ void module_call_init(module_init_type type)
 
 #ifdef CONFIG_MODULES
 
+static Modules *modinfo;
 static char *module_dirs[5];
 static int module_ndirs;
 
@@ -137,7 +145,52 @@ static void module_load_path_init(void)
 #endif
 
     assert(module_ndirs <= ARRAY_SIZE(module_dirs));
+}
 
+static void module_load_modinfo(void)
+{
+    char *file, *json;
+    FILE *fp;
+    int i, size;
+    Visitor *v;
+    Error *errp = NULL;
+
+    if (modinfo) {
+        return;
+    }
+
+    for (i = 0; i < module_ndirs; i++) {
+        file = g_strdup_printf("%s/modinfo.json", module_dirs[i]);
+        fp = fopen(file, "r");
+        if (fp != NULL) {
+            break;
+        }
+        g_free(file);
+    }
+    if (NULL == fp) {
+        warn_report("No modinfo.json file found.");
+        return;
+    } else {
+        trace_module_load_modinfo(file);
+    }
+
+    fseek(fp, 0, SEEK_END);
+    size = ftell(fp);
+    fseek(fp, 0, SEEK_SET);
+    json = g_malloc0(size + 1);
+    fread(json, size, 1, fp);
+    json[size] = 0;
+    fclose(fp);
+
+    v = qobject_input_visitor_new_str(json, NULL, &errp);
+    if (errp) {
+        error_reportf_err(errp, "parse error (%s)", file);
+        g_free(file);
+        return;
+    }
+    visit_type_Modules(v, NULL, &modinfo, &errp);
+    visit_free(v);
+    g_free(file);
 }
 
 static int module_load_file(const char *fname, bool mayfail, bool 
export_symbols)
@@ -269,6 +322,7 @@ bool module_load_one(const char *prefix, const char 
*lib_name, bool mayfail)
     g_hash_table_add(loaded_modules, module_name);
 
     module_load_path_init();
+    module_load_modinfo();
 
     for (i = 0; i < module_ndirs; i++) {
         fname = g_strdup_printf("%s/%s%s",
diff --git a/util/trace-events b/util/trace-events
index 806cac14a762..8b2afcbd109a 100644
--- a/util/trace-events
+++ b/util/trace-events
@@ -100,3 +100,6 @@ uffd_create_fd_api_failed(int err) "errno: %i"
 uffd_create_fd_api_noioctl(uint64_t ioctl_req, uint64_t ioctl_supp) 
"ioctl_req: 0x%" PRIx64 "ioctl_supp: 0x%" PRIx64
 uffd_register_memory_failed(void *addr, uint64_t length, uint64_t mode, int 
err) "addr: %p length: %" PRIu64 " mode: 0x%" PRIx64 " errno: %i"
 uffd_unregister_memory_failed(void *addr, uint64_t length, int err) "addr: %p 
length: %" PRIu64 " errno: %i"
+
+# module.c
+module_load_modinfo(const char *filename) "modinfo %s"
-- 
2.31.1