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Mon, 9 Aug 2021 13:45:51 +0000 (GMT) Received: from smtp.tlslab.ibm.com (unknown [9.101.4.1]) by d06av26.portsmouth.uk.ibm.com (Postfix) with SMTP; Mon, 9 Aug 2021 13:45:51 +0000 (GMT) Received: from yukon.ibmuc.com (unknown [9.171.54.114]) by smtp.tlslab.ibm.com (Postfix) with ESMTP id B381B22016C; Mon, 9 Aug 2021 15:45:50 +0200 (CEST) From: =?utf-8?q?C=C3=A9dric_Le_Goater?= To: David Gibson , Greg Kurz Subject: [PATCH 03/26] ppc/pnv: powerpc_excp: Do not discard HDECR exception when entering power-saving mode Date: Mon, 9 Aug 2021 15:45:24 +0200 Message-Id: <20210809134547.689560-4-clg@kaod.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210809134547.689560-1-clg@kaod.org> References: <20210809134547.689560-1-clg@kaod.org> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: KJ0W_1oRh4gBOuPZ7z8GEocDmSjZzbO0 X-Proofpoint-ORIG-GUID: KJ0W_1oRh4gBOuPZ7z8GEocDmSjZzbO0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.391, 18.0.790 definitions=2021-08-09_04:2021-08-06, 2021-08-09 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 mlxlogscore=481 mlxscore=0 clxscore=1034 spamscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 bulkscore=0 adultscore=0 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2107140000 definitions=main-2108090101 Received-SPF: softfail client-ip=148.163.158.5; envelope-from=clg@kaod.org; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -11 X-Spam_score: -1.2 X-Spam_bar: - X-Spam_report: (-1.2 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org, =?utf-8?q?C=C3=A9dric_Le_Goa?= =?utf-8?q?ter?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The Hypervisor Decrementer exception should not be generated while the CPU is in power-saving mode (see cpu_ppc_hdecr_excp()). However, discarding the exception before entering the power-saving mode is wrong since we would loose a previously generated HDEC. Fixes: 4b236b621bf0 ("ppc: Initial HDEC support") Signed-off-by: Cédric Le Goater --- This fixes CPU hard lockups when doing intensive I/Os on the machine. target/ppc/excp_helper.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c index a79a0ed465e5..7b6ac16eef72 100644 --- a/target/ppc/excp_helper.c +++ b/target/ppc/excp_helper.c @@ -1211,12 +1211,6 @@ void helper_pminsn(CPUPPCState *env, powerpc_pm_insn_t insn) cs = env_cpu(env); cs->halted = 1; - /* - * The architecture specifies that HDEC interrupts are discarded - * in PM states - */ - env->pending_interrupts &= ~(1 << PPC_INTERRUPT_HDECR); - /* Condition for waking up at 0x100 */ env->resume_as_sreset = (insn != PPC_PM_STOP) || (env->spr[SPR_PSSCR] & PSSCR_EC);