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Wed, 19 Aug 2026 11:12:45 +0000 (GMT) Received: from fedora (unknown [9.5.7.39]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTPS; Wed, 19 Aug 2026 11:12:45 +0000 (GMT) Date: Wed, 19 Aug 2026 16:42:27 +0530 From: Amit Machhiwal To: Anushree Mathur Cc: Vaibhav Jain , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Anushree Mathur Subject: Re: [PATCH] KVM: PPC: Book3S HV nestedv2: Don't drop pending doorbell across L2 entry Message-ID: <20260819163954.3b08c1c2-55-amachhiw@linux.ibm.com> Mail-Followup-To: Anushree Mathur , Vaibhav Jain , linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Madhavan Srinivasan , Michael Ellerman , Anushree Mathur References: <20260803034426.44249-1-vaibhav@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwODE5MDA4NSBTYWx0ZWRfXwPToNPv7Ajd6 shAZNay+yq2cwd/79rEPYt8z7d+spslzXNWvwEuX5Jdb2do0S/ke389DNy3vkmj2wA2UYOQFPJ5 igLXeZpxmJj/cTrFyyQcF0Ut+Nn1Vo4= X-Proofpoint-GUID: 4PBO9K_S8bsVHQNfryDiy8JjdlChxNrC X-Proofpoint-ORIG-GUID: 4PBO9K_S8bsVHQNfryDiy8JjdlChxNrC X-Authority-Analysis: v=2.4 cv=RPmD2Yi+ c=1 sm=1 tr=0 ts=6a858fb4 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=8nJEP1OIZ-IA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=Y2IxJ9c9Rs8Kov3niI8_:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=bcat9CMdyZZG9BD0Pj8A:9 a=3ZKOabzyN94A:10 a=wPNLvfGTeEIA:10 a=zZCYzV9kfG8A:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODE5MDA4NSBTYWx0ZWRfX0TT6dY9iai6f eKj9qxhcrZzh3NQWeKLqWVHENv2fQlryoue+kXyDkXi5hXrwZ+ufktUjo7uVsOFkxKLJ08JPgFw ervydC1035F2UVbGHs6cKTxF//mYplGoclCcZVoCONNk3AYJ+hCxZLf+qSv17W15IcAabLHPAj2 5XOn1dCiKdqvhpn0d8aAHoBsQ/vhTvqZURwJ4nxOcuyOrPRAgqQXWBC5GCAsBfOfbalHs+O1Yzv 7lzu8j1d2A8OJ3SUuYBqgDkCC7LIWFwRuXectXewxX3+makhBoIlO+qU+GhOQc6DkSFHLdBUKRF KkBBTHW+hRw3EZYJ6hk02wFUgiaaNbEZbj3xH78PtZtApGCv/dxhDY4EYtfCfxCtDGJcjMPJ3DR ivIu92BHByzcIzpJ0Ur5ZRw57hrb4P9yfVMeI4EZV+uSohDaXlKSVjWk39JSeyoPM2gA1nEYRu3 8yZ7NBnC07GKOsJ67qQ== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-19_03,2026-08-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 phishscore=0 adultscore=0 spamscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608190085 On 2026/08/19 04:32 PM, Anushree Mathur wrote: > > <...snip...> > > b) Even after applying the patch also it is giving same softlockup issue as > mentioned above: Hi Anushree, There was a v2 of this patch sent here: https://lore.kernel.org/all/20260812034628.1122115-1-vaibhav@linux.ibm.com/ Did you get a chance to test it? Could you verify if the issue persists with the v2 as well? Thanks, Amit > Though I have enough vcpus and memory on the guest (16 vcpus , 13Gi of > memory)  and ample amount of memory and cpus > present on host still these softlockups are happening after applying the > patch too. I tried reducing stress also on the guest > but still this issue is seen. > > stress-ng --cpu 4 --vm 2 --vm-bytes 1G --hdd 2 --hdd-bytes 1G --sched other > --timeout 3600000s > > If you are planning to send next version of this patch, > Please do add my reported-by: > Reported-by: Anushree Mathur >