Hi Andrzej, After having looked at the PMRWBM part of the spec, I think that the Bit 1 mode should be implemented for slightly better performance. Bit 0 mode is not well-suited to virtualization for the reasons I mentioned in the previous email.
The spec describes Bit 1 mode as "The completion of a read to the PMRSTS register shall ensure that all prior writes to the Persistent Memory Region have completed and are persistent". Stefan
