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GET /api/1.1/patches/2230951/?format=api
{ "id": 2230951, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2230951/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-ppc/patch/20260430085409.680930-1-shivangu@linux.ibm.com/", "project": { "id": 69, "url": "http://patchwork.ozlabs.org/api/1.1/projects/69/?format=api", "name": "QEMU powerpc development", "link_name": "qemu-ppc", "list_id": "qemu-ppc.nongnu.org", "list_email": "qemu-ppc@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260430085409.680930-1-shivangu@linux.ibm.com>", "date": "2026-04-30T08:54:09", "name": "ppc/spapr: Skip system reset for quiesced CPUs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "273d56c6076e7b4edbebbe68708d5865c4fc19d8", "submitter": { "id": 91952, "url": "http://patchwork.ozlabs.org/api/1.1/people/91952/?format=api", "name": "Shivang Upadhyay", "email": "shivangu@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-ppc/patch/20260430085409.680930-1-shivangu@linux.ibm.com/mbox/", "series": [ { "id": 502239, "url": "http://patchwork.ozlabs.org/api/1.1/series/502239/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-ppc/list/?series=502239", "date": "2026-04-30T08:54:09", "name": "ppc/spapr: Skip system reset for quiesced CPUs", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502239/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2230951/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2230951/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=D2cpdBE0;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc\n :content-transfer-encoding:date:from:message-id:mime-version\n :subject:to; s=pp1; bh=VxRae1HQC2CYuXasuQKwTR+evDo63C89Io5E48FhD\n O0=; b=D2cpdBE0Cmeg0EyBNKIlzyNDSfWguuk9F7dEE0dUJy6srkorMzNfUIFI9\n D8biSV+IVUDbrv5oi7rIGcGwiBHERYSeq31F20wy2m2XalDEHKLqZzLzbglEBJz6\n x6+2Q4Zw2NtqcVWWCwxT1Gshg5fzrPZKu560dnMtgdFUpf+40HNva0TV+n3zHDp3\n g4uAuFUD3u+4WcUJECKcu6zVOlYXv8qgMpsCBd7bX9MyrzkpgsdmqDBH05hQLtNx\n IiuYJFEFgmPPnC1DFNzJhhYFhFuhVVsMufpSpbvB2vE+jBLX4ctZhuTAhB8wkX+z\n lpFuSLpAdi672PSTLNysKi4nEKBHg==", "From": "Shivang Upadhyay <shivangu@linux.ibm.com>", "To": "qemu-ppc@nongnu.org, qemu-devel@nongnu.org", "Cc": "Shivang Upadhyay <shivangu@linux.ibm.com>,\n Sourabh Jain <sourabhjain@linux.ibm.com>,\n Harsh Prateek Bora <harshpb@linux.ibm.com>,\n Mahesh J Salgaonkar <mahesh@linux.ibm.com>,\n Anushree Mathur <anushree.mathur@linux.vnet.ibm.com>,\n Vishal Chourasia <vishalc@linux.ibm.com>", "Subject": "[PATCH] ppc/spapr: Skip system reset for quiesced CPUs", "Date": "Thu, 30 Apr 2026 14:24:09 +0530", "Message-ID": "<20260430085409.680930-1-shivangu@linux.ibm.com>", "X-Mailer": "git-send-email 2.53.0", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Authority-Analysis": "v=2.4 cv=AqDeGu9P c=1 sm=1 tr=0 ts=69f318c3 cx=c_pps\n a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17\n a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=792TYEGmVTkjWTrGcAYA:9", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDMwMDA4NyBTYWx0ZWRfXy5MMaPBh1Prj\n N2i/mcvICBPkmYilXvuX8Q0h/QWnvANVdJXi2kho5Wq19Cu+teJMfkm3ZXa99Qpacofai4r3d0D\n f+QPlqXcoEjyhsMu80eoMMPdUzXvvfe72b1zULsbgmHsuQtYCVcVOnWKZS7rrGArdL/3+avZsrC\n Wo1+vsZNRLmfCgDkV0cRnijO2InsTxJntek68jkZOImPNVlcgKvjmC/E8cGu97JksNRG5lGhFxR\n ShV6t/+zDZh3hECrdc1gE4/ReYD/LQdMr/efW37h6WkJD7rHrZ9BjqmV1B7crA6u7aqMXHNhpwI\n yfQIknkc6glrjUFHbxe8QrRoBMQyWWyKbVsOjKYRKjUxLP94BhRVio0t/HeoRbQHUfeTQ4dN6ks\n L1v9w7XW1W+JqDqEbirjzVpx1IvSITs584pDi4G7wNpDwt+XFMr7DIL7wdOqFHl8FQ9DqrBk56J\n 6r9GGO5jvw9YNH4pbmw==", "X-Proofpoint-GUID": "RlCB-gKURb2FDNLNWEUhaYE8cEGnzqBX", "X-Proofpoint-ORIG-GUID": "RlCB-gKURb2FDNLNWEUhaYE8cEGnzqBX", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-30_02,2026-04-28_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n adultscore=0 priorityscore=1501 phishscore=0 suspectscore=0 clxscore=1015\n lowpriorityscore=0 spamscore=0 bulkscore=0 impostorscore=0 malwarescore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604300087", "Received-SPF": "pass client-ip=148.163.156.1;\n envelope-from=shivangu@linux.ibm.com; helo=mx0a-001b2d01.pphosted.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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7,\n RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-ppc@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "<qemu-ppc.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-ppc>,\n <mailto:qemu-ppc-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-ppc>", "List-Post": "<mailto:qemu-ppc@nongnu.org>", "List-Help": "<mailto:qemu-ppc-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-ppc>,\n <mailto:qemu-ppc-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-ppc-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "During DLPAR CPU hotplug, newly added CPUs start in RTAS stopped state\n(quiesced). If a kexec crash occurs before the guest starts these CPUs\nvia start-cpu RTAS call, H_SIGNAL_SYS_RESET_ALL_OTHERS will reset them\nanyway, causing the kdump kernel to hang:\n\n [ 5.519483][ T1] Processor 0 is stuck.\n [ 11.089481][ T1] Processor 1 is stuck.\n\nThe hypervisor should only reset CPUs that the guest has started. The\ncpu->env.quiesced flag tracks RTAS stopped state - CPUs in this state\nare already inactive and should not be reset.\n\nSkip system reset for quiesced CPUs to prevent kdump hangs during CPU\nhotplug operations.\n\nCc: Sourabh Jain <sourabhjain@linux.ibm.com>\nCc: Harsh Prateek Bora <harshpb@linux.ibm.com>\nCc: Mahesh J Salgaonkar <mahesh@linux.ibm.com>\nReported-by: Anushree Mathur <anushree.mathur@linux.vnet.ibm.com>\nSuggested-by: Vishal Chourasia <vishalc@linux.ibm.com>\nSigned-off-by: Shivang Upadhyay <shivangu@linux.ibm.com>\n---\n hw/ppc/spapr_hcall.c | 4 ++++\n 1 file changed, 4 insertions(+)", "diff": "diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c\nindex 032805a8d0..e63ec24f0c 100644\n--- a/hw/ppc/spapr_hcall.c\n+++ b/hw/ppc/spapr_hcall.c\n@@ -1105,6 +1105,10 @@ static target_ulong h_signal_sys_reset(PowerPCCPU *cpu,\n continue;\n }\n }\n+\n+ /* Skip quiesced CPUs */\n+ if (c->env.quiesced) continue;\n+\n run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL);\n }\n return H_SUCCESS;\n", "prefixes": [] }