Merge remote-tracking branch 'remotes/elmarco/tags/dump-pull-request' into staging

# gpg: Signature made Tue 02 Jan 2018 13:51:26 GMT
# gpg:                using RSA key 0xDAE8E10975969CE5
# gpg: Good signature from "Marc-André Lureau <marcandre.lureau@redhat.com>"
# gpg:                 aka "Marc-André Lureau <marcandre.lureau@gmail.com>"
# Primary key fingerprint: 87A9 BD93 3F87 C606 D276  F62D DAE8 E109 7596 9CE5

* remotes/elmarco/tags/dump-pull-request:
  dump-guest-memory.py: fix "You can't do that without a process to debug"
  dump: fix note_name_equal()

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

dump.c

@@ -788,12 +788,7 @@ static bool note_name_equal(DumpState *s,
     get_note_sizes(s, note, &head_size, &name_size, NULL);
     head_size = ROUND_UP(head_size, 4);
 
-    if (name_size != len ||
-        memcmp(note + head_size, "VMCOREINFO", len)) {
-        return false;
-    }
-
-    return true;
+    return name_size == len && memcmp(note + head_size, name, len) == 0;
 }
 
 /* write common header, sub header and elf note to vmcore */

hw/misc/vmcoreinfo.c

@@ -35,6 +35,8 @@ static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
 {
     VMCoreInfoState *s = VMCOREINFO(dev);
     FWCfgState *fw_cfg = fw_cfg_find();
+    /* for gdb script dump-guest-memory.py */
+    static VMCoreInfoState * volatile vmcoreinfo_state G_GNUC_UNUSED;
 
     /* Given that this function is executing, there is at least one VMCOREINFO
      * device. Check if there are several.
@@ -56,6 +58,7 @@ static void vmcoreinfo_realize(DeviceState *dev, Error **errp)
                              &s->vmcoreinfo, sizeof(s->vmcoreinfo), false);
 
     qemu_register_reset(vmcoreinfo_reset, dev);
+    vmcoreinfo_state = s;
 }
 
 static const VMStateDescription vmstate_vmcoreinfo = {

scripts/dump-guest-memory.py

@@ -546,8 +546,7 @@ shape and this command should mostly work."""
         return None
 
     def add_vmcoreinfo(self):
-        vmci = '(VMCoreInfoState *)' + \
-               'object_resolve_path_type("", "vmcoreinfo", 0)'
+        vmci = 'vmcoreinfo_realize::vmcoreinfo_state'
         if not gdb.parse_and_eval("%s" % vmci) \
            or not gdb.parse_and_eval("(%s)->has_vmcoreinfo" % vmci):
             return