Messages in this thread | | | Subject | Re: [PATCH 4/4] selftests/sgx: Trigger the reclaimer and #PF handler | From | Reinette Chatre <> | Date | Tue, 6 Jul 2021 11:34:54 -0700 |
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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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