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Tue, 14 Jun 2022 08:29:13 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D3EF9A4051; Tue, 14 Jun 2022 08:29:12 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.145.3.226]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 14 Jun 2022 08:29:12 +0000 (GMT) From: Frederic Barrat To: clg@kaod.org, danielhb413@gmail.com, qemu-ppc@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH] target/ppc: cpu_init: Clean up stop state on cpu reset Date: Tue, 14 Jun 2022 10:29:12 +0200 Message-Id: <20220614082912.378355-1-fbarrat@linux.ibm.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: lcU5p9Zhcpb3wALbwW-XLpRtaOCZcIMn X-Proofpoint-GUID: hMZm3Fj_FIz5r13kwOZxEyVuUyeo7BXG X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.874,Hydra:6.0.517,FMLib:17.11.64.514 definitions=2022-06-14_02,2022-06-13_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 phishscore=0 malwarescore=0 mlxlogscore=817 impostorscore=0 lowpriorityscore=0 suspectscore=0 adultscore=0 bulkscore=0 mlxscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2204290000 definitions=main-2206140031 Received-SPF: pass client-ip=148.163.158.5; envelope-from=fbarrat@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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The 'resume_as_sreset' attribute of a cpu can be set when a thread is entering a stop state on ppc books. It causes the thread to be re-routed to vector 0x100 when woken up by an exception. So it must be cleaned on reset or a thread might be re-routed unexpectedly after a reset, when it was not in a stop state and/or when the appropriate exception handler isn't set up yet. Signed-off-by: Frederic Barrat Reviewed-by: Fabiano Rosas Reviewed-by: Cédric Le Goater --- I didn't find an appropriate commit to add a "Fixes:". It originates when adding support for power management states but the code looked quite different in 2016 and it's not clear whether we were supporting reset then. target/ppc/cpu_init.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/target/ppc/cpu_init.c b/target/ppc/cpu_init.c index 0f891afa04..c16cb8dbe7 100644 --- a/target/ppc/cpu_init.c +++ b/target/ppc/cpu_init.c @@ -7186,6 +7186,9 @@ static void ppc_cpu_reset(DeviceState *dev) } pmu_update_summaries(env); } + + /* clean any pending stop state */ + env->resume_as_sreset = 0; #endif hreg_compute_hflags(env); env->reserve_addr = (target_ulong)-1ULL;