QEMU already implements H_CAS called by SLOF. The existing handler prepares a diff FDT and SLOF applies it on top of its current tree. In SLOF-less setup when the user explicitly selected "bios=no", this updates the FDT from the OS, updates it and writes back to the OS. The new behavior is advertised to the OS via "/chosen/qemu,h_cas".
Signed-off-by: Alexey Kardashevskiy <a...@ozlabs.ru> --- include/hw/ppc/spapr.h | 5 +++++ hw/ppc/spapr.c | 24 ++++++++++++++++----- hw/ppc/spapr_hcall.c | 49 +++++++++++++++++++++++++++++++++++++++--- 3 files changed, 70 insertions(+), 8 deletions(-) diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h index 7f5d7a70d27e..73cd9cf25b83 100644 --- a/include/hw/ppc/spapr.h +++ b/include/hw/ppc/spapr.h @@ -766,9 +766,14 @@ struct SpaprEventLogEntry { void spapr_events_init(SpaprMachineState *sm); void spapr_dt_events(SpaprMachineState *sm, void *fdt); +int spapr_h_cas_do_compose_response(SpaprMachineState *spapr, void *fdt, + SpaprOptionVector *ov5_updates); int spapr_h_cas_compose_response(SpaprMachineState *sm, target_ulong addr, target_ulong size, SpaprOptionVector *ov5_updates); +#define FDT_MAX_SIZE 0x100000 +void *spapr_build_fdt(SpaprMachineState *spapr); + void close_htab_fd(SpaprMachineState *spapr); void spapr_setup_hpt_and_vrma(SpaprMachineState *spapr); void spapr_free_hpt(SpaprMachineState *spapr); diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c index b097a99951f1..f84895f4a8b4 100644 --- a/hw/ppc/spapr.c +++ b/hw/ppc/spapr.c @@ -978,6 +978,19 @@ static bool spapr_hotplugged_dev_before_cas(void) return false; } +int spapr_h_cas_do_compose_response(SpaprMachineState *spapr, void *fdt, + SpaprOptionVector *ov5_updates) +{ + /* Fixup cpu nodes */ + _FDT((spapr_fixup_cpu_dt(fdt, spapr))); + + if (spapr_dt_cas_updates(spapr, fdt, ov5_updates)) { + return -1; + } + + return 0; +} + int spapr_h_cas_compose_response(SpaprMachineState *spapr, target_ulong addr, target_ulong size, SpaprOptionVector *ov5_updates) @@ -1009,10 +1022,7 @@ int spapr_h_cas_compose_response(SpaprMachineState *spapr, _FDT((fdt_open_into(fdt_skel, fdt, size))); g_free(fdt_skel); - /* Fixup cpu nodes */ - _FDT((spapr_fixup_cpu_dt(fdt, spapr))); - - if (spapr_dt_cas_updates(spapr, fdt, ov5_updates)) { + if (spapr_h_cas_do_compose_response(spapr, fdt, ov5_updates)) { return -1; } @@ -1232,6 +1242,10 @@ static void spapr_dt_chosen(SpaprMachineState *spapr, void *fdt) /* We always implemented RTAS as hcall, tell guests to call it directly */ _FDT(fdt_setprop_cell(fdt, chosen, "qemu,h_rtas", 1)); + /* Tell the guest that H_CAS will return the entire FDT now, not the diff */ + if (!spapr->bios_enabled) { + _FDT(fdt_setprop_cell(fdt, chosen, "qemu,h_cas", 1)); + } spapr_dt_ov5_platform_support(spapr, fdt, chosen); @@ -1262,7 +1276,7 @@ static void spapr_dt_hypervisor(SpaprMachineState *spapr, void *fdt) } } -static void *spapr_build_fdt(SpaprMachineState *spapr) +void *spapr_build_fdt(SpaprMachineState *spapr) { MachineState *machine = MACHINE(spapr); MachineClass *mc = MACHINE_GET_CLASS(machine); diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index b964d94f330b..c5cb06c9d507 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -17,6 +17,7 @@ #include "hw/ppc/spapr_ovec.h" #include "mmu-book3s-v3.h" #include "hw/mem/memory-device.h" +#include "sysemu/device_tree.h" static bool has_spr(PowerPCCPU *cpu, int spr) { @@ -1774,9 +1775,51 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu, /* legacy hash or new hash: */ spapr_setup_hpt_and_vrma(spapr); } - spapr->cas_reboot = - (spapr_h_cas_compose_response(spapr, args[1], args[2], - ov5_updates) != 0); + + if (spapr->bios_enabled) { + spapr->cas_reboot = + (spapr_h_cas_compose_response(spapr, args[1], args[2], + ov5_updates) != 0); + } else { + int size; + void *fdt, *fdt_skel; + struct fdt_header hdr = { 0 }; + + cpu_physical_memory_read(args[1], &hdr, sizeof(hdr)); + size = fdt32_to_cpu(hdr.totalsize); + if (size > FDT_MAX_SIZE) { + return H_NOT_AVAILABLE; + } + + fdt_skel = g_malloc0(size); + cpu_physical_memory_read(args[1], fdt_skel, size); + + fdt = g_malloc0(FDT_MAX_SIZE); + fdt_open_into(fdt_skel, fdt, FDT_MAX_SIZE); + g_free(fdt_skel); + + if (spapr_h_cas_do_compose_response(spapr, fdt, ov5_updates)) { + g_free(fdt); + return H_NOT_AVAILABLE; + } + fdt_pack(fdt); + if (fdt_totalsize(fdt) > FDT_MAX_SIZE) { + error_report("FDT too big ! 0x%x bytes (max is 0x%x)", + fdt_totalsize(fdt), FDT_MAX_SIZE); + g_free(fdt); + return H_NOT_AVAILABLE; + } + + /* Load the fdt */ + cpu_physical_memory_write(args[1], fdt, fdt_totalsize(fdt)); + + g_free(spapr->fdt_blob); + spapr->fdt_size = fdt_totalsize(fdt); + spapr->fdt_initial_size = spapr->fdt_size; + spapr->fdt_blob = fdt; + + qemu_fdt_dumpdtb(fdt, fdt_totalsize(fdt)); + } } /* -- 2.17.1