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Thu, 14 Apr 2022 16:40:22 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 22DFA11C052; Thu, 14 Apr 2022 16:40:22 +0000 (GMT) Received: from [9.145.94.207] (unknown [9.145.94.207]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 14 Apr 2022 16:40:22 +0000 (GMT) Message-ID: Date: Thu, 14 Apr 2022 18:40:21 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: [RFC v4 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG Content-Language: en-US To: Sourabh Jain , linuxppc-dev@ozlabs.org, mpe@ellerman.id.au References: <20220411084357.157308-1-sourabhjain@linux.ibm.com> <20220411084357.157308-3-sourabhjain@linux.ibm.com> From: Laurent Dufour In-Reply-To: <20220411084357.157308-3-sourabhjain@linux.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: gzNSrCx5ih8bbN0d1KyEKsY-2LuR8ctD X-Proofpoint-ORIG-GUID: 0X39dvd59PWDZo-Pf6DH5ZEiDIJORK8r X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.858,Hydra:6.0.486,FMLib:17.11.64.514 definitions=2022-04-14_04,2022-04-14_02,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 spamscore=0 malwarescore=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 adultscore=0 mlxscore=0 suspectscore=0 impostorscore=0 clxscore=1015 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2204140088 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mahesh@linux.vnet.ibm.com, eric.devolder@oracle.com, kexec@lists.infradead.org, bhe@redhat.com, hbathini@linux.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 11/04/2022, 10:43:54, Sourabh Jain wrote: > The option CRASH_HOTPLUG enables, in kernel update to kexec segments on > hotplug events. > > All the updates needed on the capture kernel load path in the kernel for > both kexec_load and kexec_file_load system will be kept under this config. > > Signed-off-by: Sourabh Jain > Reviewed-by: Eric DeVolder Reviewed-by: Laurent Dufour > --- > arch/powerpc/Kconfig | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index b779603978e1..777db33f75b5 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -623,6 +623,17 @@ config FA_DUMP > If unsure, say "y". Only special kernels like petitboot may > need to say "N" here. > > +config CRASH_HOTPLUG > + bool "kernel updates of crash kexec segments" > + depends on CRASH_DUMP && (HOTPLUG_CPU) && KEXEC_FILE > + help > + An efficient way to keep the capture kernel up-to-date with CPU > + hotplug events. On CPU hotplug event the kexec segments of capture > + kernel becomes stale and need to be updated with latest CPU data. > + In this method the kernel performs minimal update to only relevant > + kexec segments on CPU hotplug event, instead of triggering full > + capture kernel reload from userspace using udev rule. > + > config PRESERVE_FA_DUMP > bool "Preserve Firmware-assisted dump" > depends on PPC64 && PPC_POWERNV && !FA_DUMP From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Dufour Date: Thu, 14 Apr 2022 18:40:21 +0200 Subject: [RFC v4 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG In-Reply-To: <20220411084357.157308-3-sourabhjain@linux.ibm.com> References: <20220411084357.157308-1-sourabhjain@linux.ibm.com> <20220411084357.157308-3-sourabhjain@linux.ibm.com> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: kexec@lists.infradead.org On 11/04/2022, 10:43:54, Sourabh Jain wrote: > The option CRASH_HOTPLUG enables, in kernel update to kexec segments on > hotplug events. > > All the updates needed on the capture kernel load path in the kernel for > both kexec_load and kexec_file_load system will be kept under this config. > > Signed-off-by: Sourabh Jain > Reviewed-by: Eric DeVolder Reviewed-by: Laurent Dufour > --- > arch/powerpc/Kconfig | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig > index b779603978e1..777db33f75b5 100644 > --- a/arch/powerpc/Kconfig > +++ b/arch/powerpc/Kconfig > @@ -623,6 +623,17 @@ config FA_DUMP > If unsure, say "y". Only special kernels like petitboot may > need to say "N" here. > > +config CRASH_HOTPLUG > + bool "kernel updates of crash kexec segments" > + depends on CRASH_DUMP && (HOTPLUG_CPU) && KEXEC_FILE > + help > + An efficient way to keep the capture kernel up-to-date with CPU > + hotplug events. On CPU hotplug event the kexec segments of capture > + kernel becomes stale and need to be updated with latest CPU data. > + In this method the kernel performs minimal update to only relevant > + kexec segments on CPU hotplug event, instead of triggering full > + capture kernel reload from userspace using udev rule. > + > config PRESERVE_FA_DUMP > bool "Preserve Firmware-assisted dump" > depends on PPC64 && PPC_POWERNV && !FA_DUMP