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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=148.163.156.1; envelope-from=harshpb@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, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @ibm.com) X-ZM-MESSAGEID: 1761222289756154100 Content-Type: text/plain; charset="utf-8" From: Aditya Gupta With all support in place for preserving memory regions, enable fadump by exporting the "ibm,kernel-dump" property in the device tree, representing the fadump dump information, in case of a crash. Currently "ibm,configure-kernel-dump" RTAS call is already registered, which tells the kernel that the platform (QEMU) supports fadump. Now, in case of a crash, if fadump was registered, we also pass "ibm,kernel-dump" in device tree, which tells the kernel that the fadump dump is active. Pass "fadump=3Don" to enable Linux to use firmware assisted dump. Logs of a linux boot with firmware assisted dump: $ ./build/qemu-system-ppc64 -M pseries,x-vof=3Don --cpu power10 --smp 4= -m 4G -kernel some-vmlinux -initrd some-initrd -append "debug fadump=3Don = crashkernel=3D1G" -nographic [ 0.000000] fadump: Reserved 1024MB of memory at 0x00000040000000 (S= ystem RAM: 4096MB) [ 0.000000] fadump: Initialized 0x40000000 bytes cma area at 1024MB = from 0x400102a8 bytes of memory reserved for firmware-assisted dump ... [ 1.084686] rtas fadump: Registration is successful! ... # cat /sys/kernel/debug/powerpc/fadump_region CPU :[0x00000040000000-0x000000400013df] 0x13e0 bytes, Dumped: 0x0 HPTE:[0x000000400013e0-0x000000400013df] 0x0 bytes, Dumped: 0x0 DUMP: Src: 0x00000000000000, Dest: 0x00000040010000, Size: 0x40000000, = Dumped: 0x0 bytes [0x0000000921a000-0x0000000921a7ff]: cmdline append: '' # echo c > /proc/sysrq-trigger The fadump boot after crash: [ 0.000000] rtas fadump: Firmware-assisted dump is active. [ 0.000000] fadump: Updated cmdline: debug fadump=3Don crashkernel= =3D1G [ 0.000000] fadump: Firmware-assisted dump is active. [ 0.000000] fadump: Reserving 3072MB of memory at 0x00000040000000 f= or preserving crash data .... # file /proc/vmcore /proc/vmcore: ELF 64-bit LSB core file, 64-bit PowerPC or cisco 7500, O= penPOWER ELF V2 ABI, version 1 (SYSV), SVR4-style Analysing the vmcore with crash-utility: KERNEL: vmlinux-6.14-rc2 DUMPFILE: vmcore-fc92fb373aa0 CPUS: 4 DATE: Wed Mar 12 23:39:23 CDT 2025 UPTIME: 00:00:22 LOAD AVERAGE: 0.13, 0.03, 0.01 TASKS: 95 NODENAME: buildroot RELEASE: 6.12.0-rc4+ VERSION: #1 SMP Fri Jan 3 00:15:17 IST 2025 MACHINE: ppc64le (1000 Mhz) MEMORY: 4 GB PANIC: "Kernel panic - not syncing: sysrq triggered crash" PID: 269 COMMAND: "sh" TASK: c00000000a050b00 [THREAD_INFO: c00000000a050b00] CPU: 0 STATE: TASK_RUNNING (PANIC) Signed-off-by: Aditya Gupta Reviewed-by: Sourabh Jain Tested-by: Shivang Upadhyay Link: https://lore.kernel.org/qemu-devel/20251021134823.1861675-7-adityag@l= inux.ibm.com Signed-off-by: Harsh Prateek Bora --- hw/ppc/spapr.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index d6cfb9acbc..6764730beb 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -904,6 +904,8 @@ static void spapr_dt_rtas_fadump(SpaprMachineState *spa= pr, void *fdt, int rtas) { MachineState *ms =3D MACHINE(spapr); MachineClass *mc =3D MACHINE_GET_CLASS(ms); + FadumpMemStruct *fdm =3D &spapr->registered_fdm; + uint16_t dump_status_flag; =20 uint32_t max_possible_cpus =3D mc->possible_cpu_arch_ids(ms)->len; uint64_t fadump_cpu_state_size =3D 0; @@ -953,6 +955,16 @@ static void spapr_dt_rtas_fadump(SpaprMachineState *sp= apr, void *fdt, int rtas) fadump_versions, sizeof(fadump_versions)))); _FDT((fdt_setprop(fdt, rtas, "ibm,configure-kernel-dump-sizes", fadump_rgn_sizes, sizeof(fadump_rgn_sizes)))); + + dump_status_flag =3D be16_to_cpu(fdm->header.dump_status_flag); + if (dump_status_flag & FADUMP_STATUS_DUMP_TRIGGERED) { + uint64_t fdm_size =3D + sizeof(struct FadumpSectionHeader) + + (be16_to_cpu(fdm->header.dump_num_sections) * + sizeof(struct FadumpSection)); + + _FDT((fdt_setprop(fdt, rtas, "ibm,kernel-dump", fdm, fdm_size))); + } } =20 static void spapr_dt_rtas(SpaprMachineState *spapr, void *fdt) --=20 2.43.5