Re: [Qemu-devel] [PATCHv2 12/12] pseries: Remove spapr_create_fdt_skel()

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Quoting David Gibson (2016-10-20 21:56:40)
> For historical reasons construction of the guest device tree in spapr is
> divided between spapr_create_fdt_skel() which is called at init time, and
> spapr_build_fdt() which runs at reset time.  Over time, more and more
> things have needed to be moved to reset time.
> 
> Previous cleanups mean the only things left in spapr_create_fdt_skel() are
> the properties of the root node itself.  Finish consolidating these two
> parts of device tree construction, by moving this to the start of
> spapr_build_fdt(), and removing spapr_create_fdt_skel() entirely.
> 
> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
> Reviewed-by: Thomas Huth <thuth@redhat.com>

Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>

> ---
>  hw/ppc/spapr.c         | 94 +++++++++++++++++++-------------------------------
>  include/hw/ppc/spapr.h |  1 -
>  2 files changed, 36 insertions(+), 59 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 97369bd..2253c1e 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -271,57 +271,6 @@ static void add_str(GString *s, const gchar *s1)
>      g_string_append_len(s, s1, strlen(s1) + 1);
>  }
> 
> -static void *spapr_create_fdt_skel(sPAPRMachineState *spapr)
> -{
> -    void *fdt;
> -    char *buf;
> -
> -    fdt = g_malloc0(FDT_MAX_SIZE);
> -    _FDT((fdt_create(fdt, FDT_MAX_SIZE)));
> -
> -    _FDT((fdt_finish_reservemap(fdt)));
> -
> -    /* Root node */
> -    _FDT((fdt_begin_node(fdt, "")));
> -    _FDT((fdt_property_string(fdt, "device_type", "chrp")));
> -    _FDT((fdt_property_string(fdt, "model", "IBM pSeries (emulated by qemu)")));
> -    _FDT((fdt_property_string(fdt, "compatible", "qemu,pseries")));
> -
> -    /*
> -     * Add info to guest to indentify which host is it being run on
> -     * and what is the uuid of the guest
> -     */
> -    if (kvmppc_get_host_model(&buf)) {
> -        _FDT((fdt_property_string(fdt, "host-model", buf)));
> -        g_free(buf);
> -    }
> -    if (kvmppc_get_host_serial(&buf)) {
> -        _FDT((fdt_property_string(fdt, "host-serial", buf)));
> -        g_free(buf);
> -    }
> -
> -    buf = qemu_uuid_unparse_strdup(&qemu_uuid);
> -
> -    _FDT((fdt_property_string(fdt, "vm,uuid", buf)));
> -    if (qemu_uuid_set) {
> -        _FDT((fdt_property_string(fdt, "system-id", buf)));
> -    }
> -    g_free(buf);
> -
> -    if (qemu_get_vm_name()) {
> -        _FDT((fdt_property_string(fdt, "ibm,partition-name",
> -                                  qemu_get_vm_name())));
> -    }
> -
> -    _FDT((fdt_property_cell(fdt, "#address-cells", 0x2)));
> -    _FDT((fdt_property_cell(fdt, "#size-cells", 0x2)));
> -
> -    _FDT((fdt_end_node(fdt))); /* close root node */
> -    _FDT((fdt_finish(fdt)));
> -
> -    return fdt;
> -}
> -
>  static int spapr_populate_memory_node(void *fdt, int nodeid, hwaddr start,
>                                         hwaddr size)
>  {
> @@ -916,11 +865,44 @@ static void *spapr_build_fdt(sPAPRMachineState *spapr,
>      int ret;
>      void *fdt;
>      sPAPRPHBState *phb;
> +    char *buf;
> 
> -    fdt = g_malloc(FDT_MAX_SIZE);
> +    fdt = g_malloc0(FDT_MAX_SIZE);
> +    _FDT((fdt_create_empty_tree(fdt, FDT_MAX_SIZE)));
> 
> -    /* open out the base tree into a temp buffer for the final tweaks */
> -    _FDT((fdt_open_into(spapr->fdt_skel, fdt, FDT_MAX_SIZE)));
> +    /* Root node */
> +    _FDT(fdt_setprop_string(fdt, 0, "device_type", "chrp"));
> +    _FDT(fdt_setprop_string(fdt, 0, "model", "IBM pSeries (emulated by qemu)"));
> +    _FDT(fdt_setprop_string(fdt, 0, "compatible", "qemu,pseries"));
> +
> +    /*
> +     * Add info to guest to indentify which host is it being run on
> +     * and what is the uuid of the guest
> +     */
> +    if (kvmppc_get_host_model(&buf)) {
> +        _FDT(fdt_setprop_string(fdt, 0, "host-model", buf));
> +        g_free(buf);
> +    }
> +    if (kvmppc_get_host_serial(&buf)) {
> +        _FDT(fdt_setprop_string(fdt, 0, "host-serial", buf));
> +        g_free(buf);
> +    }
> +
> +    buf = qemu_uuid_unparse_strdup(&qemu_uuid);
> +
> +    _FDT(fdt_setprop_string(fdt, 0, "vm,uuid", buf));
> +    if (qemu_uuid_set) {
> +        _FDT(fdt_setprop_string(fdt, 0, "system-id", buf));
> +    }
> +    g_free(buf);
> +
> +    if (qemu_get_vm_name()) {
> +        _FDT(fdt_setprop_string(fdt, 0, "ibm,partition-name",
> +                                qemu_get_vm_name()));
> +    }
> +
> +    _FDT(fdt_setprop_cell(fdt, 0, "#address-cells", 2));
> +    _FDT(fdt_setprop_cell(fdt, 0, "#size-cells", 2));
> 
>      /* /interrupt controller */
>      spapr_dt_xics(spapr->xics, fdt, PHANDLE_XICP);
> @@ -2014,10 +1996,6 @@ static void ppc_spapr_init(MachineState *machine)
>      register_savevm_live(NULL, "spapr/htab", -1, 1,
>                           &savevm_htab_handlers, spapr);
> 
> -    /* Prepare the device tree */
> -    spapr->fdt_skel = spapr_create_fdt_skel(spapr);
> -    assert(spapr->fdt_skel != NULL);
> -
>      /* used by RTAS */
>      QTAILQ_INIT(&spapr->ccs_list);
>      qemu_register_reset(spapr_ccs_reset_hook, spapr);
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index ae7d1d7..d5d6e57 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -69,7 +69,6 @@ struct sPAPRMachineState {
>      bool kernel_le;
>      uint32_t initrd_base;
>      long initrd_size;
> -    void *fdt_skel;
>      uint64_t rtc_offset; /* Now used only during incoming migration */
>      struct PPCTimebase tb;
>      bool has_graphics;
> -- 
> 2.7.4
>