accel/tcg: also suppress asynchronous IRQs for cpu_io_recompile

While it would be technically correct to allow an IRQ to happen (as
the offending instruction never really completed) it messes up
instrumentation. We already take care to only use memory
instrumentation on the block, we should also suppress IRQs.

Reviewed-by: Pierrick Bouvier <[email protected]>
Reviewed-by: Julian Ganz <[email protected]>
Reviewed-by: Richard Henderson <[email protected]>
Signed-off-by: Alex Bennée <[email protected]>
Message-Id: <[email protected]>

Author: stsquad

accel/tcg/translate-all.c

@@ -633,9 +633,10 @@ void cpu_io_recompile(CPUState *cpu, uintptr_t retaddr)
      * Exit the loop and potentially generate a new TB executing the
      * just the I/O insns. We also limit instrumentation to memory
      * operations only (which execute after completion) so we don't
-     * double instrument the instruction.
+     * double instrument the instruction. Also don't let an IRQ sneak
+     * in before we execute it.
      */
-    cpu->cflags_next_tb = curr_cflags(cpu) | CF_MEMI_ONLY | n;
+    cpu->cflags_next_tb = curr_cflags(cpu) | CF_MEMI_ONLY | CF_NOIRQ | n;
 
     if (qemu_loglevel_mask(CPU_LOG_EXEC)) {
         vaddr pc = cpu->cc->get_pc(cpu);