[PATCH 2/2] target/i386: do not block singlestep for STI

[Paolo Bonzini <pbonzini@redhat.com>]

STI will trigger a singlestep exception even if it has inhibit-IRQ
behavior.  Do not suppress single-step for all IRQ-inhibiting
instructions, instead special case MOV SS and POP SS.

Cc: qemu-stable@nongnu.org
Fixes: f0f0136abba ("target/i386: no single-step exception after MOV or POP SS", 2024-05-25)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 target/i386/tcg/translate.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/target/i386/tcg/translate.c b/target/i386/tcg/translate.c
index a4e935b043b..ed43c95c1d9 100644
--- a/target/i386/tcg/translate.c
+++ b/target/i386/tcg/translate.c
@@ -2047,11 +2047,15 @@ static void gen_movl_seg(DisasContext *s, X86Seg seg_reg, TCGv src, bool inhibit
      * stop as a special handling must be done to disable hardware
      * interrupts for the next instruction.
      *
+     * This is the last instruction, so it's okay to overwrite
+     * HF_TF_MASK; the next TB will start with the flag set.
+     *
      * DISAS_EOB_INHIBIT_IRQ is a superset of DISAS_EOB_NEXT which
      * might have been set above.
      */
     if (inhibit_irq) {
         s->base.is_jmp = DISAS_EOB_INHIBIT_IRQ;
+        s->flags &= ~HF_TF_MASK;
     }
 }
 
@@ -2302,7 +2306,7 @@ gen_eob(DisasContext *s, int mode)
     if (mode == DISAS_EOB_RECHECK_TF) {
         gen_helper_rechecking_single_step(tcg_env);
         tcg_gen_exit_tb(NULL, 0);
-    } else if ((s->flags & HF_TF_MASK) && mode != DISAS_EOB_INHIBIT_IRQ) {
+    } else if (s->flags & HF_TF_MASK) {
         gen_helper_single_step(tcg_env);
     } else if (mode == DISAS_JUMP &&
                /* give irqs a chance to happen */
-- 
2.49.0