Re: [Qemu-devel] [PATCH] fw_cfg: insert string blobs via qemu cmdline

["Gabriel L. Somlo" <somlo@cmu.edu>]

On Mon, Sep 28, 2015 at 01:46:33PM -0600, Eric Blake wrote:
> On 09/28/2015 07:30 AM, Laszlo Ersek wrote:
> 
> >>  
> >> +Small enough items may be provided directly as strings on the command
> >> +line, using the syntax:
> >> +
> >> +    -fw_cfg [name=]<item_name>,content=<string>
> >> +
> > 
> > Please consider spelling out that these blobs will NOT be NUL-terminated
> > when viewed on the guest. (It kinda follows from all the other fw_cfg
> > things, but once we leave host-side files for qemu command line strings,
> > it might become non-obvious to users.)
> 
> Or else GUARANTEE that it will be NUL-terminated (and the only way to
> get blobs that are not NUL terminated is to use files rather than content=).

I went with the first suggestion (leave out the trailing '\0' from the
blob payload, and say so in docs/specs/fw_cfg.txt) in v2 of the patch.

Do you feel strongly about including the \0 ? Otherwise, we're already
there :)

Thanks much,
--Gabriel