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Mon, 21 Mar 2022 08:04:29 +0000 (GMT) From: Sourabh Jain To: linuxppc-dev@ozlabs.org, mpe@ellerman.id.au Subject: [RFC v3 PATCH 2/5] powerpc/crash hp: introduce a new config option CRASH_HOTPLUG Date: Mon, 21 Mar 2022 13:34:19 +0530 Message-Id: <20220321080422.56255-3-sourabhjain@linux.ibm.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220321080422.56255-1-sourabhjain@linux.ibm.com> References: <20220321080422.56255-1-sourabhjain@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: IYWaM012jc-yYfjtqmZGbGJJFtD9Gnlj X-Proofpoint-GUID: 9wc2Fif_iH-irD1KW1EkSQTEoxLFKAXf X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.850,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-21_02,2022-03-15_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 suspectscore=0 adultscore=0 bulkscore=0 lowpriorityscore=0 spamscore=0 mlxscore=0 malwarescore=0 clxscore=1015 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203210049 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+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 --- arch/powerpc/Kconfig | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index b779603978e1..b816339ef8c7 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 hotplug event (CPU/memory) the kexec segments + of capture kernel becomes stale and need to be updated with latest + CPU and memory regions. In this method the kernel performs minimal + update to only relevant kexec segments on CPU hotplug event, instead + of triggering full capture reload from userspace using udev rule. + config PRESERVE_FA_DUMP bool "Preserve Firmware-assisted dump" depends on PPC64 && PPC_POWERNV && !FA_DUMP