Re: [PATCH 2/2] arm/efi: Use dom0less configuration when using EFI boot

[Jan Beulich <jbeulich@suse.com>]

On 16.09.2021 03:16, Stefano Stabellini wrote:
> On Wed, 15 Sep 2021, Luca Fancellu wrote:
>> +static void __init handle_dom0less_domain_node(EFI_FILE_HANDLE dir_handle,
>> +                                               int domain_node,
>> +                                               int addr_cells,
>> +                                               int size_cells)
>> +{
>> +    /*
>> +     * Check for nodes compatible with multiboot,{kernel,ramdisk,device-tree}
>> +     * inside this node
>> +     */
>> +    for ( int module_node = fdt_first_subnode(fdt, domain_node);
> 
> int module_node;
> 
> for ( module_node = fdt_first_subnode(fdt, domain_node);

Not just here iirc from briefly looking over the patch as a whole
yesterday: Use of plain "int" would better be limited to cases where
values may also be negative. I don't suppose that's possible here as
well as in a number of other cases.

>> @@ -1285,14 +1286,21 @@ efi_start(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable)
>>              efi_bs->FreePool(name.w);
>>          }
>>  
>> -        if ( !name.s )
>> -            blexit(L"No Dom0 kernel image specified.");
>> -
>>          efi_arch_cfg_file_early(loaded_image, dir_handle, section.s);
>>  
>> -        option_str = split_string(name.s);
>> +#ifdef CONFIG_ARM
>> +        /* dom0less feature is supported only on ARM */
>> +        dom0less_found = check_dom0less_efi_boot(dir_handle);
>> +#endif
> 
> Rather than an #ifdef here you can simply implement
> check_dom0less_efi_boot on x86 as a static inline returning always
> false.

Indeed, and the properly named (efi_arch_...()).

Jan