On 05/04/16 13:32, David Woodhouse wrote:
> On Wed, 2016-05-04 at 13:27 +0200, Laszlo Ersek wrote:
>>
>> Hm, I don't think so.
>>
>> OVMF includes CpuS3DataDxe with SMM_REQUIRE=TRUE only. My understanding
>> is that the reporter encountered the issue with CSM_ENABLE=TRUE,
>> SMM_REQUIRE=FALSE.
> 
> <digression@>
> 
> Of course, now we have SMM, perhaps we should revisit the model where
> the SeaBIOS CSM just takes over the hardware completely (and cannot
> return to UEFI).
> 
> I understand that the "traditional" model is that the CSM does
> basically nothing for itself, and all its drivers (like the INT 13h
> services) actually just thunk through SMM to the UEFI runtime?

What benefit would it provide if SeaBIOS used SMIs to call into UEFI /
if SeaBIOS could return to UEFI?

Thanks
Laszlo

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