[RFC PATCH v6 3/5] softmmu/vl: Allow -fw_cfg 'blob_id' option to set any file pathname

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

This is to silent:

  $ qemu-system-x86_64 \
    -object tls-cipher-suites,id=ciphersuite0,priority=@SYSTEM \
    -fw_cfg name=etc/edk2/https/ciphers,blob_id=ciphersuite0
  qemu-system-x86_64: -fw_cfg name=etc/edk2/https/ciphers,blob_id=ciphersuite0: warning: externally provided fw_cfg item names should be prefixed with "opt/"

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 softmmu/vl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/softmmu/vl.c b/softmmu/vl.c
index f76c53ad2e..3b77dcc00d 100644
--- a/softmmu/vl.c
+++ b/softmmu/vl.c
@@ -2052,7 +2052,7 @@ static int parse_fw_cfg(void *opaque, QemuOpts *opts, Error **errp)
                    FW_CFG_MAX_FILE_PATH - 1);
         return -1;
     }
-    if (strncmp(name, "opt/", 4) != 0) {
+    if (!nonempty_str(blob_id) && strncmp(name, "opt/", 4) != 0) {
         warn_report("externally provided fw_cfg item names "
                     "should be prefixed with \"opt/\"");
     }
-- 
2.21.3