linux-kernel - Re: [PATCH v5 2/2] selftests/sgx: Migrate to kselftest harness

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Date:   Tue, 18 May 2021 22:57:19 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Reinette Chatre <reinette.chatre@...el.com>
Cc:     shuah@...nel.org, linux-kselftest@...r.kernel.org,
        linux-sgx@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/2] selftests/sgx: Migrate to kselftest harness

On Tue, May 18, 2021 at 08:49:00PM +0300, Jarkko Sakkinen wrote:
> On Mon, May 17, 2021 at 10:03:42AM -0700, Reinette Chatre wrote:
> > Hi Jarkko,
> > 
> > On 5/12/2021 2:53 PM, Jarkko Sakkinen wrote:
> > > Migrate to kselftest harness. Use a fixture test with enclave initialized
> > > and de-initialized for each of the existing three tests, in other words:
> > > 
> > > 1. One FIXTURE() for managing the enclave life-cycle.
> > > 2. Three TEST_F()'s, one for each test case.
> > > 
> > > This gives a leaps better reporting than before. Here's an example
> > > transcript:
> > > 
> > > TAP version 13
> > > 1..3
> > > 
> > > ok 1 enclave.unclobbered_vdso
> > > 
> > > ok 2 enclave.clobbered_vdso
> > > 
> > > ok 3 enclave.clobbered_vdso_and_user_function
> > > 
> > > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> > > ---
> > > 
> > > v5:
> > > * Use TH_LOG() for printing enclave address ranges instead of printf(),
> > >    based on Reinette's remark.
> > 
> > Thank you for considering my feedback. The motivation for my comment was to
> > consider how this test output will be parsed. If these tests will have their
> > output parsed by automated systems then it needs to conform to the TAP13
> > format as supported by kselftest.
> > 
> > In your latest version the output printed during a successful test has been
> > changed, using TH_LOG() as you noted. From what I can tell this is the only
> > output addressed - failing tests continue to print error messages (perror,
> > fprintf) without consideration of how they will be parsed. My apologies, I
> > am not a kselftest expert to know what the best way for this integration is.
> > 
> > Reinette
> 
> It's a valid question, yes.
> 
> The problem is that only main.c can use kselftest macros because
> kselftest_harness.h pulls 
> 
> static int test_harness_run(int __attribute__((unused)) argc,
> 			    char __attribute__((unused)) **argv)
> 
> which will not end up having a call site (because there's no
> "TEST_HARNESS_MAIN").
> 
> The whole logging thing in kselftest harness is a bit ambiguous.
> Namely:
> 
> 1. There's a macro TH_LOG() defined in kselftest_harness.h, which
>    "internally" uses fprintf().
> 2. There's an inline function ksft_print_msg() in kselftest.h
>    using vsprintf().
> 
> To add to that, kselftest_harness.h internally prints by using
> ksft_print_msg(), and provides TH_LOG(), which does not use
> ksft_print_msg().
> 
> I don't really get the logic in all this.

I tried to split TH_LOG() as separate entity but it's not possible, as the
macros access a static variable called '_metadata'.

I'm not exactly sure how to proceed from this, if we want to make logging
consistent.

I would personally suggest to leave the error messages intact in load.c,
because there is no way to make them consistent, except by removing them.

/Jarkko