How the OS knows the scratchpad region?

[Tianyu Yin]

I found that in Keystone's paper(EuroSys 2020), it says in Chapter 4.6 that "The only other

change required was a modification of the untrusted enclave loading process to make it aware of the physical address region that the scratchpad occupies."

I just wonder where is this change? I cannot find it.

[David Kohlbrenner]

Hi,

The address for the scratchpad is a platform-specific address range. For the HiFive Unleashed this is listed in the docs for the FU540U.

In our case, all this means is that you change the physical address you pass to the ELF loader when you create the enclave. (See https://github.com/keystone-enclave/keystone-sdk/blob/master/src/host/Enclave.cpp#L273)

-David

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