Re: [Qemu-devel] [PATCH v3 4/6] qemu-option: support +foo/-foo command line agruments

["Andreas Färber" <afaerber@suse.de>]

Am 11.11.2013 08:44, schrieb Alexey Kardashevskiy:
> This converts +foo/-foo to "foo=on"/"foo=off" respectively when
> QEMU parser is used for the command line options.
> 
> "-cpu" parsers in x86 and other architectures should be unaffected
> by this change.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
> ---
>  util/qemu-option.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/util/qemu-option.c b/util/qemu-option.c
> index efcb5dc..6c8667c 100644
> --- a/util/qemu-option.c
> +++ b/util/qemu-option.c
> @@ -890,6 +890,12 @@ static int opts_do_parse(QemuOpts *opts, const char *params,
>                  if (strncmp(option, "no", 2) == 0) {
>                      memmove(option, option+2, strlen(option+2)+1);
>                      pstrcpy(value, sizeof(value), "off");
> +                } else if (strncmp(option, "-", 1) == 0) {
> +                    memmove(option, option+1, strlen(option+1)+1);
> +                    pstrcpy(value, sizeof(value), "off");
> +                } else if (strncmp(option, "+", 1) == 0) {
> +                    memmove(option, option+1, strlen(option+1)+1);
> +                    pstrcpy(value, sizeof(value), "on");
>                  } else {
>                      pstrcpy(value, sizeof(value), "on");
>                  }

This looks like an interesting idea! However this is much too big a
change to just CC ppc folks on...

Jan, I wonder if this might break slirp's hostfwd option?

Not sure what other options potentially starting with '-' might be
affected. Test cases would be a helpful way of demonstrating that this
change does not have undesired side effects.

Regards,
Andreas

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