linux-kernel - Re: [PATCH v8 5/5] selftests/sgx: Refine the test enclave to have storage

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Date:   Mon, 14 Jun 2021 14:16:15 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Jarkko Sakkinen <jarkko@...nel.org>, shuah@...nel.org
Cc:     linux-kselftest@...r.kernel.org, linux-sgx@...r.kernel.org,
        Reinette Chatre <reinette.chatre@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v8 5/5] selftests/sgx: Refine the test enclave to have
 storage

On 6/10/21 2:30 AM, Jarkko Sakkinen wrote:
> Extend the enclave to have two operations: ENCL_OP_PUT and ENCL_OP_GET.
> ENCL_OP_PUT stores value inside the enclave address space and
> ENCL_OP_GET reads it. The internal buffer can be later extended to be
> variable size, and allow reclaimer tests.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> ---
>   tools/testing/selftests/sgx/defines.h     | 10 ++++
>   tools/testing/selftests/sgx/main.c        | 57 ++++++++++++++++++-----
>   tools/testing/selftests/sgx/test_encl.c   | 19 +++++++-
>   tools/testing/selftests/sgx/test_encl.lds |  3 +-
>   4 files changed, 74 insertions(+), 15 deletions(-)
> 

Test output before applying the series:

TAP version 13
1..1
# selftests: sgx: test_sgx
# Unable to open /dev/sgx_enclave: No such file or directory
# 1..0 # SKIP cannot load enclaves
ok 1 selftests: sgx: test_sgx # SKIP

Test output after applying second patch

selftests/sgx: Migrate to kselftest harness

Output changes to the following. It doesn't look like the second
patch adds any new tests. What is the point in running the tests
that fail if /dev/sgx_enclave is missing.

Unfortunately this series doesn't have a cover letter that explains
what this series is doing. I don't like the fact that the test
output and behavior changes when migrating the test to kselftest
harness. Shouldn't the output stay the same as in skip the tests
if /dev/sgx_enclave fails.

TAP version 13
1..1
# selftests: sgx: test_sgx
# TAP version 13
# 1..3
# # Starting 3 tests from 2 test cases.
# #  RUN           enclave.unclobbered_vdso ...
# Unable to open /dev/sgx_enclave: No such file or directory
# ok 2 # SKIP cannot load enclaves
# # Planned tests != run tests (3 != 1)
# # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:1 error:0
# # unclobbered_vdso: Test failed at step #4
# #          FAIL  enclave.unclobbered_vdso
# not ok 1 enclave.unclobbered_vdso
# #  RUN           enclave.clobbered_vdso ...
# Unable to open /dev/sgx_enclave: No such file or directory
# ok 3 # SKIP cannot load enclaves
# # Planned tests != run tests (3 != 2)
# # Totals: pass:0 fail:1 xfail:0 xpass:0 skip:1 error:0
# # clobbered_vdso: Test failed at step #4
# #          FAIL  enclave.clobbered_vdso
# not ok 2 enclave.clobbered_vdso
# #  RUN           enclave.clobbered_vdso_and_user_function ...
# Unable to open /dev/sgx_enclave: No such file or directory
# ok 4 # SKIP cannot load enclaves
# # Totals: pass:0 fail:2 xfail:0 xpass:0 skip:1 error:0
# # clobbered_vdso_and_user_function: Test failed at step #4
# #          FAIL  enclave.clobbered_vdso_and_user_function
# not ok 3 enclave.clobbered_vdso_and_user_function
# # FAILED: 0 / 3 tests passed.
# # Totals: pass:0 fail:3 xfail:0 xpass:0 skip:0 error:0
not ok 1 selftests: sgx: test_sgx # exit=1

thanks,
-- Shuah