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docs/tcg-plugins: document QEMU_PLUGIN behaviour 

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.

As drive-by cleanup, this patch fixes the path to the plugins
in the same section of the documentation.

Signed-off-by: Christoph Muellner <cmuellner@linux.com>
Message-Id: <20220316181412.1550044-1-cmuellner@linux.com>
[AJB: fixed some minor typos]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
This commit is contained in:
Christoph Muellner 2022-03-16 19:14:12 +01:00 committed by Alex Bennée
parent f503b7e327
commit 0f37cf2f71
1 changed files with 7 additions and 2 deletions
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9
docs/devel/tcg-plugins.rst
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@ -27,13 +27,18 @@ Once built a program can be run with multiple plugins loaded each with
their own arguments::
$QEMU $OTHER_QEMU_ARGS \
-plugin tests/plugin/libhowvec.so,inline=on,count=hint \
-plugin tests/plugin/libhotblocks.so
-plugin contrib/plugin/libhowvec.so,inline=on,count=hint \
-plugin contrib/plugin/libhotblocks.so
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.
Linux user-mode emulation also evaluates the environment variable
``QEMU_PLUGIN``::
QEMU_PLUGIN="file=contrib/plugins/libhowvec.so,inline=on,count=hint" $QEMU
Writing plugins
---------------