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    SubjectRe: [PATCH 4/4] selftests/sgx: Trigger the reclaimer and #PF handler
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    Hi Jarkko,

    On 7/5/2021 7:36 AM, Jarkko Sakkinen wrote:
    > Create a heap for the test enclave, which has the same size as all
    > available Enclave Page Cache (EPC) pages in the system. This will guarantee
    > that all test_encl.elf pages *and* SGX Enclave Control Structure (SECS)
    > have been swapped out by the page reclaimer during the load time. Actually,
    > this adds a bit more stress than that since part of the EPC gets reserved
    > for the Version Array (VA) pages.
    >
    > For each test, the page fault handler gets triggered in two occasions:
    >
    > - When SGX_IOC_ENCLAVE_INIT is performed, SECS gets swapped in by the
    > page fault handler.
    > - During the execution, each page that is referenced gets swapped in
    > by the page fault handler.
    >

    If I understand this correctly, all EPC pages are now being consumed
    during fixture setup and thus every SGX test, no matter how big or
    small, now becomes a stress test of the reclaimer instead of there being
    a unique reclaimer test. Since an enclave is set up and torn down for
    every test this seems like a significant addition. It also seems like
    this would impact future tests of dynamic page addition where not all
    scenarios could be tested with all EPC pages already consumed.

    Reinette

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