From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 07919E6815B for ; Tue, 17 Feb 2026 10:17:27 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4fFbDQ2kVCz2xjP; Tue, 17 Feb 2026 21:17:26 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=148.163.158.5 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1771323446; cv=none; b=InYMqKqC4rZrI86yNSQ3MRRXHgBrQzOJe9cxymhHmfwDK6G7umZiO0zwFPQ3Vu+6rInWgZVutpQBb3TDNZx6fR3vU2NIB+iWDdoMGPHU6LM7nGD5/Qu6mecBHln+Sqyr98cPpuDf5BS5G7kO8FQd569HWwAQ5AOepLTqsLdpydMcpvgzQW1OMh55DeDJumz/FftIx5mKNEFmlQKndwbrM5pdHWnDoA4FHV1lSjHOk/BoyCN51Hyy73jTh7jL5tJJV9s0KwtV5SZz5Ya484EM2a002clvERnPt5hDuLeyEKQhRgIwP99d677cdpeLZVg5evznTaQUwTzD/Oy7Z9hOKQ== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1771323446; c=relaxed/relaxed; bh=+6iA2uNRmnZSVEpafscIuv5WMCH1FcjhX/ZZhkOReuQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Qsatc0WI7tVDF/blOZBKF0RtR6vRQiUFAwtlKSjANWBdaLgunSflG2GVqyzZQSKsi56sK0FmFKi9P2gnr8CXJqZwIuKnYe7O5gqdiYCGC3XmnZuaVmhhsITyw7Rliw/wiqvYkgzqy1NDOjmN5qzs9HQNUJa1L/oRTDK9VqtffH35juEqtbiyjFTn7yR3tK424oH2LPWyHv+gzxdfdOY8eP1eWblpbj7qG0t2VyYQwgRWwwfMoKYnJxwwnjK/T7+NDdqPnYV+UbyV6lS+qK+VjaTdYK1BK6iZ9XACE1aO3VGuT22MvZp6zFQwEZVFZxWghDTyQ2xcETgWAcUqjJxqTA== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=XIftwzLG; dkim-atps=neutral; spf=pass (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=maddy@linux.ibm.com; receiver=lists.ozlabs.org) smtp.mailfrom=linux.ibm.com Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=XIftwzLG; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.158.5; helo=mx0b-001b2d01.pphosted.com; envelope-from=maddy@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0b-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4fFbDP1lhSz2xN5 for ; Tue, 17 Feb 2026 21:17:24 +1100 (AEDT) Received: from pps.filterd (m0360072.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 61GKZeMp1711698; Tue, 17 Feb 2026 10:17:21 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=+6iA2u NRmnZSVEpafscIuv5WMCH1FcjhX/ZZhkOReuQ=; b=XIftwzLGIdwvnFQevgDrXt r/VQdibOn+UpPq7PJmRbwQ4MUG5iJ8ItCcSN6u40N41uomURDvoa/iKTZoj+bZ7L SWXhljdzY8PoLQit2lliRGPIwuF3vrvJMZ23az+3rDTSQiktlujGKMemkVNJnli6 VkdLTUFPAf0Qw2u+47VqPMeA52B/w4ljQ6+xtVoB19TcO+fYpGPJYxEbW/maLdDB lMa2nhyJYNY9x09e4MzEEQc0O0pNK1JqN8nCdvPlGdHMdxWkBvoFsf/3S/MZY8QV JHKYpriGYBH69E+t1QbVRHW8Vz/vefujzldTNLqDf+bpbXZBZ75gWk/4MYUU964w == Received: from ppma23.wdc07v.mail.ibm.com (5d.69.3da9.ip4.static.sl-reverse.com [169.61.105.93]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4cajcjan1x-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Feb 2026 10:17:21 +0000 (GMT) Received: from pps.filterd (ppma23.wdc07v.mail.ibm.com [127.0.0.1]) by ppma23.wdc07v.mail.ibm.com (8.18.1.2/8.18.1.2) with ESMTP id 61H8e9Jj017834; Tue, 17 Feb 2026 10:17:20 GMT Received: from smtprelay05.dal12v.mail.ibm.com ([172.16.1.7]) by ppma23.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4ccb28a0ps-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 17 Feb 2026 10:17:20 +0000 Received: from smtpav05.wdc07v.mail.ibm.com (smtpav05.wdc07v.mail.ibm.com [10.39.53.232]) by smtprelay05.dal12v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 61HAHJPm26215012 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 17 Feb 2026 10:17:19 GMT Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6D28458053; Tue, 17 Feb 2026 10:17:19 +0000 (GMT) Received: from smtpav05.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D149058043; Tue, 17 Feb 2026 10:17:15 +0000 (GMT) Received: from [9.43.121.63] (unknown [9.43.121.63]) by smtpav05.wdc07v.mail.ibm.com (Postfix) with ESMTP; Tue, 17 Feb 2026 10:17:15 +0000 (GMT) Message-ID: <843b7c60-23f1-47d0-b4e8-2147c3e40c23@linux.ibm.com> Date: Tue, 17 Feb 2026 15:47:14 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Linux PPC] KVM PR and KVM HV do not work if the kernel was compiled with PREEMPT To: Christian Zigotzky , Shrikanth Hegde , linuxppc-dev , "kvm-ppc@vger.kernel.org" Cc: "R.T.Dickinson" , hypexed@yahoo.com.au, mad skateman , Christian Zigotzky References: <185d7a42-f7b4-44e1-a129-f5989d211c74@linux.ibm.com> <40154f6a-39da-959d-e039-5ab9ff62db3c@xenosoft.de> <709b864f-9daa-4a48-b3d6-39baedce63b2@linux.ibm.com> Content-Language: en-US From: Madhavan Srinivasan In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: oreMLe4WS3_esCK7anyMavWBWdp5vZsY X-Authority-Analysis: v=2.4 cv=Md9hep/f c=1 sm=1 tr=0 ts=69944031 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=tfuwDhRL1dsP2gdC5dUA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjE3MDA4NCBTYWx0ZWRfX/33nIj0QoIkx 66tVpNwP7NfGJvkhbOxCWUfx/KCNvRagisUA6PaFPt/kQaetM73YZON+bzGDhI8cHqP0KYFLJmt dyJEtEp24JMvS0J4B13ZcHvaJ2F37pQ3LZfTrzWNAa0nxR53dmLIXKDSP7z34Uj1wMKV9tpbCLB LRRbVFHWODGDCU0VFYUsBekyDoj98n62tcfwxhGlkF2r/e1ah3/6FY0aWwo5Pn4Y07oldumtPm/ AGOEJTLYmL9sAOmEH1WSagWmlVMWFIkWJYm0KDNMndwhMA4J7gieGlkNoTWK6JkotJ34M9h+VAW uh8E/H2oVPj2xZX5DuEBRwTvA0gxNwKvghc8yMbmG+yfiTDmhLdxZ6HytAGCjT7AhWA9Jcbb0Jd IiJz8o0KWymnPTsq8lkpFVeSFvbjORTcJnXKeUHuSyrMmBxzH+GEpzedN9Ie4ryxKP6U5hWAS4H bDVT4QeTRfc7KbDqFoA== X-Proofpoint-GUID: jigts_LGIG5LnNiw4PGQWrA2zHLFBym- X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-17_01,2026-02-16_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 spamscore=0 adultscore=0 priorityscore=1501 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602170084 On 2/17/26 3:14 PM, Christian Zigotzky wrote: > On 17/02/26 10:03, Shrikanth Hegde wrote: >> >> >> On 2/17/26 2:22 PM, Christian Zigotzky wrote: >>> Hi, >>> >>> Thank you for your patch. I tested the latest git kernel with your >>> patch today. Unfortunately the system freezes while booting the VM >>> with KVM HV. >>> >>> Cheers, >>> Christian >>> >>> >> Would it be possible to share the console log or boot log of KVM to the >> point it freezes? > > Unfortunately there aren't any error messages. > > I also tried it with: > > gdb --args qemu-system-ppc64 -M ppce500 -cpu e5500 -m 1024 -kernel > uImage-7.0-preempt -drive > format=raw,file=void-live-powerpc-20230317-updated2.img,index=0,if=virtio > -netdev user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw > root=/dev/vda" -device virtio-gpu-pci -device virtio-mouse-pci -device > virtio-keyboard-pci -enable-kvm -smp 4 > > and with gdb in the guest: > > qemu-system-ppc64 -s -S -M ppce500 -cpu e5500 -m 1024 -kernel > uImage-7.0-preempt -drive > format=raw,file=void-live-powerpc-20230317-updated2.img,index=0,if=virtio > -netdev user,id=mynet0 -device virtio-net,netdev=mynet0 -append "rw > root=/dev/vda" -device virtio-gpu-pci -device virtio-mouse-pci -device > virtio-keyboard-pci -enable-kvm -smp 4 > > The system freezed without any error messages. can you please share the config. I tried kvm-hv in my power8/power9 and seems to boot fine without any issues with today's upstream Maddy