[edk2-devel] [PATCH] OvmfPkg: Set PciLib for TdxDxe driver

[Min Xu]

On April 19, 2022 10:08 AM, Yao Jiewen wrote:
> 
> If TdxDxe breaks SEV, should we skip the TdxDxe in SEV path?
> 
> I don't understand why we need use Cfg8.
> 
In TdxDxe driver we need to relocate APs and it requires the TdxMailboxLib. 
The lib chain is that TdxMailbox ->  SynchronizationLib -> TimerLib (which is DxeAcpiTimerLib) -> PciLib (Which was DxePciLibI440FxQ35).
TdxDxe driver was loaded before AmdSevDxe so its lib constructors are called even it is in SEV-ES guest. In other words those lib constructor cannot be skipped in SEV-ES guest.

The analysis of the root cause (why DxePciLibI440FxQ35 trigger the broken) is in below link:
https://edk2.groups.io/g/devel/message/88968

Thanks
Min


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