Re: [PATCH] docs/tcg-plugins: document QEMU_PLUGIN behaviour

["Christoph Müllner" <cmuellner@linux.com>]

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On Wed, Mar 16, 2022 at 4:01 PM Alex Bennée <alex.bennee@linaro.org> wrote:

>
> Christoph Muellner <cmuellner@linux.com> writes:
>
> > QEMU plugins can be loaded via command line arguments or via
> > the QEMU_PLUGIN environment variable. Currently, only the first method
> > is documented. Let's document QEMU_PLUGIN.
> >
> > Signed-off-by: Christoph Muellner <cmuellner@linux.com>
> > ---
> >  docs/devel/tcg-plugins.rst | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/docs/devel/tcg-plugins.rst b/docs/devel/tcg-plugins.rst
> > index f93ef4fe52..ba48be18d0 100644
> > --- a/docs/devel/tcg-plugins.rst
> > +++ b/docs/devel/tcg-plugins.rst
> > @@ -34,6 +34,10 @@ Arguments are plugin specific and can be used to
> modify their
> >  behaviour. In this case the howvec plugin is being asked to use inline
> >  ops to count and break down the hint instructions by type.
> >
> > +QEMU also evaluates the environment variable ``QEMU_PLUGIN``::
>
> You should also make it clear this only works for *-user builds of QEMU.
> For system emulation you still need to use the CLI interface.


Looks like this is even more restrictive as I can see support only in
linux-user/main.c.
I'll reword this to only be available for Linux user-mode emulation.

Thanks!


>
>
> > +
> > +  QEMU_PLUGIN="file=tests/plugin/libhowec.so,inline=on,count=hint" $QEMU
> > +
> >  Writing plugins
> >  ---------------
>
>
> --
> Alex Bennée
>

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