Re: [kvm-unit-tests PATCH v1 1/3] s390x: add library for skey-related functions

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Quoting Claudio Imbrenda (2022-12-02 13:56:47)
> On Fri, 2 Dec 2022 13:48:17 +0100
> Thomas Huth <thuth@xxxxxxxxxx> wrote:
> 
> > On 02/12/2022 12.56, Janosch Frank wrote:
> > > On 12/2/22 12:32, Thomas Huth wrote:  
> > >> On 02/12/2022 11.44, Nico Boehr wrote:  
> > >>> Quoting Thomas Huth (2022-12-02 10:09:03)  
> > >>>> On 02/12/2022 10.03, Janosch Frank wrote:  
> > >>>>> On 12/1/22 09:46, Nico Boehr wrote:  
> > >>>>>> Upcoming changes will add a test which is very similar to the existing
> > >>>>>> skey migration test. To reduce code duplication, move the common
> > >>>>>> functions to a library which can be re-used by both tests.
> > >>>>>>  
> > >>>>>
> > >>>>> NACK
> > >>>>>
> > >>>>> We're not putting test specific code into the library.  
> > >>>>
> > >>>> Do we need a new file (in the third patch) for the new test at all, or 
> > >>>> could
> > >>>> the new test simply be added to s390x/migration-skey.c instead?  
> > >>>
> > >>> Mh, not quite. One test wants to change storage keys *before* migrating, 
> > >>> the other *while* migrating. Since we can only migrate once, it is not 
> > >>> obvious to me how we could do that in one run.
> > >>>
> > >>> Speaking of one run, what we could do is add a command line argument 
> > >>> which decides which test to run and then call the same test with 
> > >>> different arguments in unittests.cfg.  
> > >>
> > >> Yes, that's what I had in mind - use a command line argument to select the
> > >> test ... should be OK as long as both variants are listed in unittests.cfg,
> > >> shouldn't it?
> > >>
> > >>    Thomas  
> > > 
> > > @Thomas @Claudio:
> > > I see two possible solutions if we want a "testlib" at some point (which for 
> > > the record I don't have anything against):
> > > 
> > > Putting the files into lib/s390x/testlib/* which will then be part of our 
> > > normal lib.
> > > That's a minimal effort solution. It still puts those files into lib/* but 
> > > they are at least contained in a directory.
> > > 
> > > Putting the files into s390x/testlib/* and creating a proper new lib.
> > > Which means we'd need a few more lines of makefile changes.  
> > 
> > Though this is an excellent topic for a Friday afternoon bikeshedding ... I 
> > don't mind much either way. I maybe just got a small preference to not touch 
> > the main lib/ folder here. I guess you could even call it 
> > s390x/migration-skey-common.c and leave the lib logic out of the game ... 
> > but I don't really mind. Up to you to decide ;-)
> > 
> 
> I really like the idea of having only one test and use a commandline
> parameter to decide which variant to run
> 
> this way no need to put things in external files

OK, I also like this suggestion, then I'll refactor the tests.




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