Hi,

> Ah, I forget to reserve the work-area as RT_Data in below code:
>       BuildMemoryAllocationHob (
>         (EFI_PHYSICAL_ADDRESS)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaBase),
>         (UINT64)(UINTN)FixedPcdGet32 (PcdOvmfWorkAreaSize),
>         PlatformInfoHob->S3Supported ? EfiACPIMemoryNVS : 
> EfiRuntimeServicesData  <-- ACPI_NVS is not accessible either in OS-Runtime.
>         );
> https://github.com/tianocore/edk2/blob/master/OvmfPkg/Library/PlatformInitLib/MemDetect.c#L1022-L1026

With that changed to use EfiRuntimeServicesData unconditionally the page
fault is gone.

> Gerd, do you think we can reserve Ovmf WorkArea as RT_Data even when S3 is 
> supported?

Hmm, not fully sure how the various memory types are handled when the
VM is suspended.

take care,
  Gerd



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