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[Qemu-devel] [PATCH for-2.6] fw_cfg: Adopt /opt/RFQDN convention

From: Markus Armbruster
Subject: [Qemu-devel] [PATCH for-2.6] fw_cfg: Adopt /opt/RFQDN convention
Date: Mon, 18 Apr 2016 18:42:09 +0200

FW CFG's primary user is QEMU, which uses it to expose configuration
information (in the widest sense) to Firmware.  Thus the name FW CFG.

FW CFG can also be used by others for their own purposes.  QEMU is
merely acting as transport then.  Names starting with opt/ are reseved
for such uses.  There is no provision, however, to guide safe sharing
among different such users.

Fix that, losely following QMP precedence: names should start with
opt/RFQDN/, where RFQDN is a reverse fully qualified domain name you

Based on a more ambitious patch from Michael Tsirkin.

Cc: Gerd Hoffmann <address@hidden>
Cc: Gabriel L. Somlo <address@hidden>
Cc: Laszlo Ersek <address@hidden>
Cc: Michael S. Tsirkin <address@hidden>
Signed-off-by: Markus Armbruster <address@hidden>
Michael's patch:
Message-ID: <address@hidden>

Michael, I'm happy to add your S-o-b if you feel this patch is
derivative of yours despite my extensive changes.  I didn't do it
proactively because I didn't want to misrepresent your opinions on
this matter.

 docs/specs/fw_cfg.txt | 36 +++++++++++++++++-------------------
 qemu-options.hx       | 24 +++++++++++++++++++-----
 2 files changed, 36 insertions(+), 24 deletions(-)

diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt
index 5414140..90e74bb 100644
--- a/docs/specs/fw_cfg.txt
+++ b/docs/specs/fw_cfg.txt
@@ -210,29 +210,27 @@ the following syntax:
     -fw_cfg [name=]<item_name>,file=<path>
-where <item_name> is the fw_cfg item name, and <path> is the location
-on the host file system of a file containing the data to be inserted.
-Small enough items may be provided directly as strings on the command
-line, using the syntax:
     -fw_cfg [name=]<item_name>,string=<string>
-The terminating NUL character of the content <string> will NOT be
-included as part of the fw_cfg item data, which is consistent with
-the absence of a NUL terminator for items inserted via the file option.
+See QEMU man page for more documentation.
-Both <item_name> and, if applicable, the content <string> are passed
-through by QEMU without any interpretation, expansion, or further
-processing. Any such processing (potentially performed e.g., by the shell)
-is outside of QEMU's responsibility; as such, using plain ASCII characters
-is recommended.
+Using item_name with plain ASCII characters only is recommended.
-NOTE: Users *SHOULD* choose item names beginning with the prefix "opt/"
-when using the "-fw_cfg" command line option, to avoid conflicting with
-item names used internally by QEMU. For instance:
+Item names beginning with "opt/" are reserved for users.  QEMU will
+never create entries with such names unless explicitly ordered by the
-    -fw_cfg name=opt/my_item_name,file=./my_blob.bin
+To avoid clashes among different users, it is strongly recommended
+that you use names beginning with opt/RFQDN/, where RFQDN is a
+reverse fully qualified domain name you control.  For instance, if
+SeaBIOS wanted to define additional names, prefix "opt/org.seabios/"
+would be appropriate.
-Similarly, QEMU developers *SHOULD NOT* use item names prefixed with
-"opt/" when inserting items programmatically, e.g. via fw_cfg_add_file().
+For historical reasons, "opt/ovmf/" is reserved for OVMF firmware.
+Prefix "opt/org.qemu/" is reserved for QEMU itself.
+Use of names not beginning with "opt/" is potentially dangerous and
+entirely unsupported.  QEMU will warn if you try.
diff --git a/qemu-options.hx b/qemu-options.hx
index 587de8f..6106520 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2864,18 +2864,32 @@ ETEXI
 DEF("fw_cfg", HAS_ARG, QEMU_OPTION_fwcfg,
     "-fw_cfg [name=]<name>,file=<file>\n"
-    "                add named fw_cfg entry from file\n"
+    "                add named fw_cfg entry with contents from file\n"
     "-fw_cfg [name=]<name>,string=<str>\n"
-    "                add named fw_cfg entry from string\n",
+    "                add named fw_cfg entry with contents from string\n",
 @item -fw_cfg address@hidden,address@hidden
 @findex -fw_cfg
-Add named fw_cfg entry from file. @var{name} determines the name of
-the entry in the fw_cfg file directory exposed to the guest.
+Add named fw_cfg entry with contents from file @var{file}.
 @item -fw_cfg address@hidden,address@hidden
-Add named fw_cfg entry from string.
+Add named fw_cfg entry with contents from string @var{str}.
+The terminating NUL character of the contents of @var{str} will not be
+included as part of the fw_cfg item data. To insert contents with
+embedded NUL characters, you have to use the @var{file} parameter.
+The fw_cfg entries are passed by QEMU through to the guest.
+    -fw_cfg name=opt/com.mycompany/blob,file=./my_blob.bin
address@hidden example
+creates an fw_cfg entry named opt/com.mycompany/blob with contents
+from ./my_blob.bin.
 DEF("serial", HAS_ARG, QEMU_OPTION_serial, \

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