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Fri, 02 May 2025 08:41:32 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFGS7iLLAlsD7SjMZLl0Y4ur9Z12e72C3wCiW0Pf1FKLDQrwprdBD1vQ/TEhZbvMOP5WU1SZA== X-Received: by 2002:a05:6000:40db:b0:39f:efb:c2f6 with SMTP id ffacd0b85a97d-3a099adcb13mr2468104f8f.33.1746200491787; Fri, 02 May 2025 08:41:31 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org Subject: [PATCH 2/2] target/i386: do not block singlestep for STI Date: Fri, 2 May 2025 17:41:25 +0200 Message-ID: <20250502154125.152090-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250502154125.152090-1-pbonzini@redhat.com> References: <20250502154125.152090-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.644, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1746200552454019000 Content-Type: text/plain; charset="utf-8" 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 --- 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 se= g_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 =3D DISAS_EOB_INHIBIT_IRQ; + s->flags &=3D ~HF_TF_MASK; } } =20 @@ -2302,7 +2306,7 @@ gen_eob(DisasContext *s, int mode) if (mode =3D=3D 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 !=3D DISAS_EOB_INHIBIT_IRQ)= { + } else if (s->flags & HF_TF_MASK) { gen_helper_single_step(tcg_env); } else if (mode =3D=3D DISAS_JUMP && /* give irqs a chance to happen */ --=20 2.49.0