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This can result in an incomplete dtb for the system, as seen in bug [1]. Fix this by deferring dtb generation until machine initialization is comple= te, using the machine_init_done_notifier hook. [1] https://lore.kernel.org/all/20260323231612.GA2637687@ax162/ Cc: Aditya Gupta Cc: Harsh Prateek Bora Cc: BALATON Zoltan Cc: qemu-stable@nongnu.org Reported-by: Nathan Chancellor Suggested-by: Peter Maydell Fixes: a16d4c2f162a86d ("ppc/pnv: fix dumpdtb option") Signed-off-by: Shivang Upadhyay Tested-by: Nathan Chancellor Reviewed-by: Aditya Gupta Reviewed-by: Peter Maydell Message-ID: <20260327124136.983955-1-shivangu@linux.ibm.com> Signed-off-by: Philippe Mathieu-Daud=C3=A9 --- include/hw/ppc/pnv.h | 2 ++ hw/ppc/pnv.c | 58 +++++++++++++++++++++++++------------------- 2 files changed, 35 insertions(+), 25 deletions(-) diff --git a/include/hw/ppc/pnv.h b/include/hw/ppc/pnv.h index 24f8843a409..90028f974da 100644 --- a/include/hw/ppc/pnv.h +++ b/include/hw/ppc/pnv.h @@ -111,6 +111,8 @@ struct PnvMachineState { =20 bool big_core; bool lpar_per_core; + + Notifier machine_init_done; }; =20 PnvChip *pnv_get_chip(PnvMachineState *pnv, uint32_t chip_id); diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c index 7e54b6bc604..524563dcfc2 100644 --- a/hw/ppc/pnv.c +++ b/hw/ppc/pnv.c @@ -748,31 +748,10 @@ static void pnv_powerdown_notify(Notifier *n, void *o= paque) =20 static void pnv_reset(MachineState *machine, ResetType type) { - PnvMachineState *pnv =3D PNV_MACHINE(machine); - IPMIBmc *bmc; void *fdt; =20 qemu_devices_reset(type); =20 - /* - * The machine should provide by default an internal BMC simulator. - * If not, try to use the BMC device that was provided on the command - * line. - */ - bmc =3D pnv_bmc_find(&error_fatal); - if (!pnv->bmc) { - if (!bmc) { - if (!qtest_enabled()) { - warn_report("machine has no BMC device. Use '-device " - "ipmi-bmc-sim,id=3Dbmc0 -device isa-ipmi-bt,bm= c=3Dbmc0,irq=3D10' " - "to define one"); - } - } else { - pnv_bmc_set_pnor(bmc, pnv->pnor); - pnv->bmc =3D bmc; - } - } - fdt =3D machine->fdt; cpu_physical_memory_write(PNV_FDT_ADDR, fdt, fdt_totalsize(fdt)); } @@ -984,6 +963,37 @@ static uint64_t pnv_chip_get_ram_size(PnvMachineState = *pnv, int chip_id) return chip_id =3D=3D 0 ? 1 * GiB : QEMU_ALIGN_DOWN(ram_per_chip, 1 * = MiB); } =20 +static void pnv_machine_init_done(Notifier *notifier, void *data) +{ + PnvMachineState *pnv =3D container_of(notifier, PnvMachineState, machi= ne_init_done); + MachineState *machine =3D MACHINE(pnv); + IPMIBmc *bmc; + + /* + * The machine should provide by default an internal BMC simulator. + * If not, try to use the BMC device that was provided on the command + * line. + */ + bmc =3D pnv_bmc_find(&error_fatal); + if (!pnv->bmc) { + if (!bmc) { + if (!qtest_enabled()) { + warn_report("machine has no BMC device. Use '-device " + "ipmi-bmc-sim,id=3Dbmc0 -device isa-ipmi-bt,bm= c=3Dbmc0,irq=3D10' " + "to define one"); + } + } else { + pnv_bmc_set_pnor(bmc, pnv->pnor); + pnv->bmc =3D bmc; + } + } + + if (!machine->fdt) { + machine->fdt =3D pnv_dt_create(machine); + _FDT((fdt_pack(machine->fdt))); + } +} + static void pnv_init(MachineState *machine) { const char *bios_name =3D machine->firmware ?: FW_FILE_NAME; @@ -1244,10 +1254,8 @@ static void pnv_init(MachineState *machine) pmc->i2c_init(pnv); } =20 - if (!machine->fdt) { - machine->fdt =3D pnv_dt_create(machine); - _FDT((fdt_pack(machine->fdt))); - } + pnv->machine_init_done.notify =3D pnv_machine_init_done; + qemu_add_machine_init_done_notifier(&pnv->machine_init_done); } =20 /* --=20 2.53.0