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From: Gerd Hoffmann <kraxel@redhat.com>
Date: Thu, 17 Mar 2016 09:42:23 +0100
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Subject: Re: [Qemu-devel] [PATCH v2] vl.c: disallow command line fw cfg
 without opt/
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To: Laszlo Ersek <lersek@redhat.com>
Cc: pbonzini@redhat.com, "Gabriel L. Somlo" <somlo@cmu.edu>, qemu-devel@nongnu.org, armbru@redhat.com, mst@redhat.com

  Hi,

> > Having a mis-use of this feature become "institutionalized" over time w=
as
> > seen as a low/negligible risk at the time. Do we have any new reasons
> > to worry about it ?
>=20
> OVMF uses this feature for a few flags. They are all called
> "opt/ovmf/...". I followed the advice in "docs/specs/fw_cfg.txt" (which
> shouldn't be surprising since I seem to have reviewed every patch for
> that file):

seabios has a few flags too, in etc/.  Some of them are supported
directly by qemu (such as setting the boot menu delay).  Others are not,
and I'd like to be able to use -fw_cfg for them for testing/debugging
(any use cases beyond that should be supported by adding a less obscure
way to set them to qemu, similar to the boot delay).

Oh, and that'll most likely be more seabios testing than qemu testing,
so why require me build a special qemu version for that?

On the ovmf flags:  What kind of flags are there?  Anything a normal
user might want to set?

cheers,
  Gerd