Re: [PATCH v3 1/1] hw/nvram: Always register FW_CFG_DATA_GENERATOR_INTERFACE

[Paolo Bonzini <pbonzini@redhat.com>]

On 06/10/20 17:36, Philippe Mathieu-Daudé wrote:
> While the FW_CFG_DATA_GENERATOR_INTERFACE is only consumed
> by a device only available using system-mode (fw_cfg), it is
> implemented by a crypto component (tls-cipher-suites) which
> is always available when crypto is used.
> 
> Commit 69699f3055 introduced the following error in the
> qemu-storage-daemon binary:
> 
>   $ echo -e \
>     '{"execute": "qmp_capabilities"}\r\n{"execute": "qom-list-types"}\r\n{"execute": "quit"}\r\n' \
>     | storage-daemon/qemu-storage-daemon --chardev stdio,id=qmp0  --monitor qmp0
>   {"QMP": {"version": {"qemu": {"micro": 50, "minor": 1, "major": 5}, "package": ""}, "capabilities": ["oob"]}}
>   {"return": {}}
>   missing interface 'fw_cfg-data-generator' for object 'tls-creds'
>   Aborted (core dumped)
> 
> Since QOM dependencies are resolved at runtime, this issue
> could not be triggered at linktime, and we don't have test
> running the qemu-storage-daemon binary.
> 
> Fix by always registering the QOM interface.
> 
> Reported-by: Kevin Wolf <kwolf@redhat.com>
> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> Fixes: 69699f3055 ("crypto/tls-cipher-suites: Produce fw_cfg consumable blob")
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
>  hw/nvram/fw_cfg-interface.c | 15 +++++++++++++++
>  hw/nvram/fw_cfg.c           |  7 -------
>  MAINTAINERS                 |  2 +-
>  hw/nvram/meson.build        |  3 +++
>  4 files changed, 19 insertions(+), 8 deletions(-)
>  create mode 100644 hw/nvram/fw_cfg-interface.c
> 
> diff --git a/hw/nvram/fw_cfg-interface.c b/hw/nvram/fw_cfg-interface.c
> new file mode 100644
> index 0000000000..bcc7b1edbc
> --- /dev/null
> +++ b/hw/nvram/fw_cfg-interface.c
> @@ -0,0 +1,15 @@
> +#include "qemu/osdep.h"
> +#include "hw/nvram/fw_cfg.h"
> +
> +static const TypeInfo fw_cfg_data_generator_interface_info = {
> +    .parent = TYPE_INTERFACE,
> +    .name = TYPE_FW_CFG_DATA_GENERATOR_INTERFACE,
> +    .class_size = sizeof(FWCfgDataGeneratorClass),
> +};
> +
> +static void fw_cfg_register_interfaces(void)
> +{
> +    type_register_static(&fw_cfg_data_generator_interface_info);
> +}
> +
> +type_init(fw_cfg_register_interfaces)
> diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
> index 0e95d057fd..08539a1aab 100644
> --- a/hw/nvram/fw_cfg.c
> +++ b/hw/nvram/fw_cfg.c
> @@ -1360,18 +1360,11 @@ static const TypeInfo fw_cfg_mem_info = {
>      .class_init    = fw_cfg_mem_class_init,
>  };
>  
> -static const TypeInfo fw_cfg_data_generator_interface_info = {
> -    .parent = TYPE_INTERFACE,
> -    .name = TYPE_FW_CFG_DATA_GENERATOR_INTERFACE,
> -    .class_size = sizeof(FWCfgDataGeneratorClass),
> -};
> -
>  static void fw_cfg_register_types(void)
>  {
>      type_register_static(&fw_cfg_info);
>      type_register_static(&fw_cfg_io_info);
>      type_register_static(&fw_cfg_mem_info);
> -    type_register_static(&fw_cfg_data_generator_interface_info);
>  }
>  
>  type_init(fw_cfg_register_types)
> diff --git a/MAINTAINERS b/MAINTAINERS
> index b76fb31861..a45d908ebd 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -2054,7 +2054,7 @@ R: Laszlo Ersek <lersek@redhat.com>
>  R: Gerd Hoffmann <kraxel@redhat.com>
>  S: Supported
>  F: docs/specs/fw_cfg.txt
> -F: hw/nvram/fw_cfg.c
> +F: hw/nvram/fw_cfg*.c
>  F: stubs/fw_cfg.c
>  F: include/hw/nvram/fw_cfg.h
>  F: include/standard-headers/linux/qemu_fw_cfg.h
> diff --git a/hw/nvram/meson.build b/hw/nvram/meson.build
> index 1f2ed013b2..fd2951a860 100644
> --- a/hw/nvram/meson.build
> +++ b/hw/nvram/meson.build
> @@ -1,3 +1,6 @@
> +# QOM interfaces must be available anytime QOM is used.
> +qom_ss.add(files('fw_cfg-interface.c'))
> +
>  softmmu_ss.add(files('fw_cfg.c'))
>  softmmu_ss.add(when: 'CONFIG_CHRP_NVRAM', if_true: files('chrp_nvram.c'))
>  softmmu_ss.add(when: 'CONFIG_DS1225Y', if_true: files('ds1225y.c'))
> 

Queued, thanks.

Paolo