Re: [Qemu-devel] [qemu RFC] qapi: add "firmware.json"

[Laszlo Ersek]

On 04/10/18 12:20, Daniel P. Berrangé wrote:
> On Sat, Apr 07, 2018 at 02:01:17AM +0200, Laszlo Ersek wrote:

>> +{ 'struct' : 'SystemFirmware',
>> +  'data'   : { 'executable'                 : 'FirmwareFile',
>> +               'type'                       : 'SystemFirmwareType',
>> +               'targets'                    : [ 'str' ],
>> +               'sysfw-map'                  : 'FirmwareMapping',
>> +               '*nvram-slots'               : [ 'NVRAMSlot' ],
>> +               '*supports-uefi-secure-boot' : 'bool',
>> +               '*supports-amd-sev'          : 'bool',
>> +               '*supports-acpi-s3'          : 'bool',
>> +               '*supports-acpi-s4'          : 'bool' } }
> 
> Elsewhere in the thread I mentioned that I think we should try to use a
> union approach to isolate which information is relevant to "flash" loader
> format and which is relevant to "memory" and "kernel". To try to illustrate
> what I mean by that I've knocked up an alternative structure. I also
> incorporated the points about features & target/machine types.  I've left
> out the read/write/etc fields, but they could be put back in at the
> relevant position

I think this looks very nice; with the addition of

- "requires-smm" to "SystemFirmwareFeature":

> { 'enum' : 'SystemFirmwareFeature',
>   'data': ['acpi-s3', 'acpi-s5', 'secure-boot', 'amd-sev' ]}

- and another feature flag (perhaps in SystemFirmwareFeature, perhaps in
SystemFirmwareBinaryFlashVars) for the cmdline option "-global
driver=cfi.pflash01,property=secure,value=on",

this could be called a day as far as SeaBIOS and OVMF are concerned.

Thanks
Laszlo