From d890f2fa9f1e17a86f4e0891f175ae214a8596bf Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Mon, 26 Sep 2022 14:38:52 -0300 Subject: hw/ppc: set machine->fdt in spapr machine MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The pSeries machine never bothered with the common machine->fdt attribute. We do all the FDT related work using spapr->fdt_blob. We're going to introduce a QMP/HMP command to dump the FDT, which will rely on setting machine->fdt properly to work across all machine archs/types. Let's set machine->fdt in two places where we manipulate the FDT: spapr_machine_reset() and CAS. There are other places where the FDT is manipulated in the pSeries machines, most notably the hotplug/unplug path. For now we'll acknowledge that we won't have the most accurate representation of the FDT, depending on the current machine state, when using this QMP/HMP fdt command. Making the internal FDT representation always match the actual FDT representation that the guest is using is a problem for another day. spapr->fdt_blob is left untouched for now. To replace it with machine->fdt, since we're migrating spapr->fdt_blob, we would need to migrate machine->fdt as well. This is something that we would like to to do keep our code simpler but it's also a work we'll leave for later. Reviewed-by: David Gibson Reviewed-by: Philippe Mathieu-Daudé Signed-off-by: Daniel Henrique Barboza Message-Id: <20220926173855.1159396-14-danielhb413@gmail.com> --- hw/ppc/spapr.c | 3 +++ hw/ppc/spapr_hcall.c | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index 8bbaf4f..f79ac85 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -1713,6 +1713,9 @@ static void spapr_machine_reset(MachineState *machine) spapr->fdt_initial_size = spapr->fdt_size; spapr->fdt_blob = fdt; + /* Set machine->fdt for 'dumpdtb' QMP/HMP command */ + machine->fdt = fdt; + /* Set up the entry state */ first_ppc_cpu->env.gpr[5] = 0; diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index a8d4a6b..891206e 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -1256,6 +1256,14 @@ target_ulong do_client_architecture_support(PowerPCCPU *cpu, spapr->fdt_initial_size = spapr->fdt_size; spapr->fdt_blob = fdt; + /* + * Set the machine->fdt pointer again since we just freed + * it above (by freeing spapr->fdt_blob). We set this + * pointer to enable support for the 'dumpdtb' QMP/HMP + * command. + */ + MACHINE(spapr)->fdt = fdt; + return H_SUCCESS; } -- cgit v1.1