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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=+jZR0/RhcPlYCA89HpjQmGjv96x5KEruSJ8ewuy7SY4=; b=CHVvSt9I/kvuDAOF5ZUbXaTXbOgmKzHqIyYDoph4dTerBU9OFSu1bVYQRd4QgT0R/gj0 Cx18JeT8+F9au59t95BiPcIudDCnbquyI5GgxrwU6M7+2cvSCobZXzDeE7XVEFDdXONd 0YISi+0kPlxn7yVfw0OUiM41zhCeQy38/e0tURqp5ucQJuszIsunmEZ57RwlzqOfN5aA ZOn7Lr41e/eWT40m8ipQYCpApRhUMAtIYVrIv/z/cugSawlkumGnu+/7idc9mlULph1b wNWydBSyEe4SoxF/6wXR2TLld9yWdi3bZs01q4SORnJK9sGUm35OmOPQ9Uxauyoo00Me gg== From: Ilya Leoshkevich To: Richard Henderson , Paolo Bonzini Cc: qemu-devel@nongnu.org, Peter Maydell , Ilya Leoshkevich Subject: [PATCH RFC 1/1] tcg: Always pass the full write size to notdirty_write() Date: Mon, 7 Aug 2023 15:56:37 +0200 Message-ID: <20230807141846.786530-2-iii@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230807141846.786530-1-iii@linux.ibm.com> References: <20230807141846.786530-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: WbY8BqD5_YqxRZ6VAHIuA_enfgLSa3Tr X-Proofpoint-ORIG-GUID: 66OFGYmKCgdWbUGvO4mZ995YUuDJ0Lm5 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-08-07_14,2023-08-03_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 mlxlogscore=609 mlxscore=0 adultscore=0 impostorscore=0 spamscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 suspectscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2308070130 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=148.163.158.5; envelope-from=iii@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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 @ibm.com) X-ZM-MESSAGEID: 1691417983647100001 Content-Type: text/plain; charset="utf-8" One of notdirty_write()'s responsibilities is detecting self-modifying code. Some functions pass the full size of a write to it, some pass 1. When a write to a code section begins before a TB start, but then overlaps the TB, the paths that pass 1 don't flush a TB and don't return to the translator loop. This may be masked, one example being HELPER(vstl). There, probe_write_access() ultimately calls notdirty_write() with a size of 1 and misses self-modifying code. However, cpu_stq_be_data_ra() ultimately calls mmu_watch_or_dirty(), which in turn calls notdirty_write() with the full size. It's still worth improving this, because there may still be user-visible adverse effects in other helpers. Signed-off-by: Ilya Leoshkevich --- accel/tcg/cputlb.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/accel/tcg/cputlb.c b/accel/tcg/cputlb.c index d68fa6867ce..aa3cffbc11a 100644 --- a/accel/tcg/cputlb.c +++ b/accel/tcg/cputlb.c @@ -1582,7 +1582,7 @@ int probe_access_full(CPUArchState *env, vaddr addr, = int size, =20 /* Handle clean RAM pages. */ if (unlikely(flags & TLB_NOTDIRTY)) { - notdirty_write(env_cpu(env), addr, 1, *pfull, retaddr); + notdirty_write(env_cpu(env), addr, size, *pfull, retaddr); flags &=3D ~TLB_NOTDIRTY; } =20 @@ -1605,7 +1605,7 @@ int probe_access_full_mmu(CPUArchState *env, vaddr ad= dr, int size, =20 /* Handle clean RAM pages. */ if (unlikely(flags & TLB_NOTDIRTY)) { - notdirty_write(env_cpu(env), addr, 1, *pfull, 0); + notdirty_write(env_cpu(env), addr, size, *pfull, 0); flags &=3D ~TLB_NOTDIRTY; } =20 @@ -1626,7 +1626,7 @@ int probe_access_flags(CPUArchState *env, vaddr addr,= int size, =20 /* Handle clean RAM pages. */ if (unlikely(flags & TLB_NOTDIRTY)) { - notdirty_write(env_cpu(env), addr, 1, full, retaddr); + notdirty_write(env_cpu(env), addr, size, full, retaddr); flags &=3D ~TLB_NOTDIRTY; } =20 @@ -1661,7 +1661,7 @@ void *probe_access(CPUArchState *env, vaddr addr, int= size, =20 /* Handle clean RAM pages. */ if (flags & TLB_NOTDIRTY) { - notdirty_write(env_cpu(env), addr, 1, full, retaddr); + notdirty_write(env_cpu(env), addr, size, full, retaddr); } } =20 --=20 2.41.0