[PATCH v2 20/20] plugins: fix qemu_plugin_reset

From: Pierrick Bouvier <pierrick.bouvier(a)linaro.org&gt; 34e5e1 refactored the plugin context initialization. After this change, tcg_ctx->plugin_insn is not reset inconditionnally anymore, but only if one plugin at least is active. When uninstalling the last plugin active, we stopped reinitializing tcg_ctx->plugin_insn, which leads to memory callbacks being emitted. This results in an error as they don't appear in a plugin op sequence as expected. The correct fix is to make sure we reset plugin translation variables after current block translation ends. This way, we can catch any potential misuse of those after a given block, in more than fixing the current bug. Fixes: https://gitlab.com/qemu-project/qemu/-/issues/2570 Reviewed-by: Richard Henderson <richard.henderson(a)linaro.org&gt; Signed-off-by: Pierrick Bouvier <pierrick.bouvier(a)linaro.org&gt; Tested-by: Robbin Ehn <rehn(a)rivosinc.com&gt; Message-Id: <20241015003819.984601-1-pierrick.bouvier(a)linaro.org&gt; [AJB: trim patch version details from commit msg] Signed-off-by: Alex Bennée <alex.bennee(a)linaro.org&gt; --- accel/tcg/plugin-gen.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/accel/tcg/plugin-gen.c b/accel/tcg/plugin-gen.c index 2ee4c22bef..0f47bfbb48 100644 --- a/accel/tcg/plugin-gen.c +++ b/accel/tcg/plugin-gen.c @@ -467,4 +467,8 @@ void plugin_gen_tb_end(CPUState *cpu, size_t num_insns) /* inject the instrumentation at the appropriate places */ plugin_gen_inject(ptb); + + /* reset plugin translation state (plugin_tb is reused between blocks) */ + tcg_ctx->plugin_db = NULL; + tcg_ctx->plugin_insn = NULL; } -- 2.39.5