Re: [Qemu-devel] [PATCH 2/2] fw_cfg: set the get_boot_devices_list() ignore_suffixes parameter from machine property

[Eduardo Habkost <ehabkost@redhat.com>]

On Sun, Aug 05, 2018 at 12:28:50PM +0100, Mark Cave-Ayland wrote:
> For the older machines (such as Mac and SPARC) the DT nodes representing
> bootdevices for disk nodes are irregular for mainly historical reasons, and
> should be handled on an individual basis via a custom FWPathProvider.
> 
> Since the majority of bootdevice nodes for these machines either do not have a
> separate disk node or require different (custom) names then it is much easier
> to allow the ignore_suffixes parameter to be set on a per-machine basis via
> a machine property.
> 
> The default value for this new fwcfg_bootdevice_ignore_suffixes machine
> property is false to preserve compatibility for existing machines.
> 
> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
> ---
>  hw/core/machine.c   | 3 +++
>  hw/nvram/fw_cfg.c   | 5 ++++-
>  include/hw/boards.h | 1 +
>  3 files changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/hw/core/machine.c b/hw/core/machine.c
> index a9aeb22f03..fbadb35865 100644
> --- a/hw/core/machine.c
> +++ b/hw/core/machine.c
> @@ -525,6 +525,9 @@ static void machine_class_init(ObjectClass *oc, void *data)
>      mc->default_ram_size = 128 * MiB;
>      mc->rom_file_has_mr = true;
>  
> +    /* Default to using fwcfg bootdevice suffixes */
> +    mc->fwcfg_bootdevice_ignore_suffixes = false;
> +
>      /* numa node memory size aligned on 8MB by default.
>       * On Linux, each node's border has to be 8MB aligned
>       */
> diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
> index b23e7f64a8..ec6b8113ab 100644
> --- a/hw/nvram/fw_cfg.c
> +++ b/hw/nvram/fw_cfg.c
> @@ -861,7 +861,10 @@ static void fw_cfg_machine_reset(void *opaque)
>      void *ptr;
>      size_t len;
>      FWCfgState *s = opaque;
> -    char *bootindex = get_boot_devices_list(&len, false);
> +    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
> +
> +    char *bootindex = get_boot_devices_list(&len,
> +                          mc->fwcfg_bootdevice_ignore_suffixes);
>  
>      ptr = fw_cfg_modify_file(s, "bootorder", (uint8_t *)bootindex, len);
>      g_free(ptr);
> diff --git a/include/hw/boards.h b/include/hw/boards.h
> index d139a431a6..2cf76d82a6 100644
> --- a/include/hw/boards.h
> +++ b/include/hw/boards.h
> @@ -204,6 +204,7 @@ struct MachineClass {
>      const char **valid_cpu_types;
>      strList *allowed_dynamic_sysbus_devices;
>      bool auto_enable_numa_with_memhp;
> +    bool fwcfg_bootdevice_ignore_suffixes;

We add MachineClass field when there's no obvious place for a
device property (that we could set using compat_props).

In this case you are controlling behavior of TYPE_FW_CFG, so I
suggest adding a compat property to TYPE_FW_CFG, and setting it
on MachineClass::compat_props.  This way we avoid adding a
fw_cfg-specific field to MachineClass.

>      void (*numa_auto_assign_ram)(MachineClass *mc, NodeInfo *nodes,
>                                   int nb_nodes, ram_addr_t size);
>  
> -- 
> 2.11.0
> 
> 

-- 
Eduardo