As noted by qemu-plugins.h, plugins can neither read nor write
guest registers.

Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 accel/tcg/plugin-helpers.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/accel/tcg/plugin-helpers.h b/accel/tcg/plugin-helpers.h
index 853bd21677..9829abe4a9 100644
--- a/accel/tcg/plugin-helpers.h
+++ b/accel/tcg/plugin-helpers.h
@@ -1,4 +1,4 @@
 #ifdef CONFIG_PLUGIN
-DEF_HELPER_2(plugin_vcpu_udata_cb, void, i32, ptr)
-DEF_HELPER_4(plugin_vcpu_mem_cb, void, i32, i32, i64, ptr)
+DEF_HELPER_FLAGS_2(plugin_vcpu_udata_cb, TCG_CALL_NO_RWG, void, i32, ptr)
+DEF_HELPER_FLAGS_4(plugin_vcpu_mem_cb, TCG_CALL_NO_RWG, void, i32, i32, i64, ptr)
 #endif
-- 
2.25.1