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Re: [Qemu-devel] [PATCH v2] vl.c: disallow command line fw cfg without o

From: Gerd Hoffmann
Subject: Re: [Qemu-devel] [PATCH v2] vl.c: disallow command line fw cfg without opt/
Date: Thu, 17 Mar 2016 09:42:23 +0100


> > Having a mis-use of this feature become "institutionalized" over time was
> > seen as a low/negligible risk at the time. Do we have any new reasons
> > to worry about it ?
> 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?


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