linux-kernel - Re: [RFC v3 0/3] Fix errors when try to build kvm selftests on specified output

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Message-ID: <920ea28b-5c36-75dc-ec51-d501a0322f50@kernel.org>
Date:   Fri, 1 May 2020 11:11:39 -0600
From:   shuah <shuah@...nel.org>
To:     Xiaoyao Li <xiaoyao.li@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, shuah <shuah@...nel.org>
Subject: Re: [RFC v3 0/3] Fix errors when try to build kvm selftests on
 specified output

On 3/28/20 2:51 AM, Xiaoyao Li wrote:
> On 3/28/2020 12:03 AM, shuah wrote:
>> On 3/27/20 7:31 AM, Xiaoyao Li wrote:
>>> On 3/27/2020 4:57 AM, shuah wrote:
>>>> On 3/25/20 9:07 PM, Xiaoyao Li wrote:
>> The patches you sent are based on running the command with OUTPUT
>> set. 
> 
> The issues are also there when I use
> 
>    make O=/somewher TARGETS=kvm
> 
> from tools/testing/selftests/ directory,
> 
> Is it the right usecase?
> 
>> That is why I am asking you start with the right use-cases,
>> and gave you pointers on tests to refer to that have sub-dirs
>> and handle relocatable builds:
>>
>> futex
>> arm64
>> android
> 
> I have read the Makefile in futex, arm64, android to learn how they
> deal with subdir, they have Makefile in subdir but kvm doesn't.
> 
> I just want to create the subdir as easy as possible, so I follow the 
> method how to create subdir for LIBKVM_OBJ in kvm.
> 
> If you dislike it way you can reply it Patch 1 to disclaim clear what 
> you want to fix the subdir.
> 
>>>> Also, just build isn't sufficient for you to be able to run the
>>>> tests.
>>>>
>>>> make kselftest-install O=/path/to/mydir TARGETS=kvm will generate
>>>> run script.
>>>
>>> This command also has the x86_64 directory not created issue.
>>> Since it generates header files in kernel_src/usr/include, it doesn't 
>>> have headers path issue. But as result, the kernel_src directory is 
>>> not clean, this requires me to run "make mrproper", I *really* don't 
>>> like it.
>>>
>>>
>>
>> If the test leverages lib.mk headers install logic correctly, you
>> shouldn't see this problem.
>>
>> Yes. It does make the source directory dirty. That is the problem we
>> have to fix. I am seeing issues the issue of x86_64 not being created
>> in the case of relocatable builds.
>>
>> Thanks for working on this by the way. It is one of the tests that
>> identified as the one doesn't support relocatable builds.
>>
>> You will see fixes to others I already fixed in
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=next 
>>
>>
>> Start withe the following use0-cases to fix and then test your fixes
>> for these use-cases. The goal is to be able to run kvm from target
>> directory and source directory staying clean.
>>
>> You will have to build the kernel first in all of these cases.
>> Let's use kselftest-install which is what you would need if you
>> want build and then run tests later. Also assuming you are doing
>> native build on x86_64.
>>
>>  From main kernel Makefile: (from kernel source root dir)
>>
>> Builds in the same source directory:
>> make kselftest-install TARGETS=kvm
>>
>> Relocatable build: (from kernel source root dir)
>>
>> make O=/path/objdir  - build kernel
>> make kselftest-install O=/path/objdir TARGETS=kvm
> 
> I don't want to build kernel at all.
> 
>>  From tools/testing/selftests/kvm directory:
>> make O=/path/objdir install
> 
> Oh no. This needs to define INSTALL_PATH, and I don't want to install.
> I just want to build the testcase of kvm to anywhere else to make srcdir 
> clean.
> 
> Besides this command make both kernel src and selftest/kvm dirty.
> 
>> Install step is important especially for relocatable builds,
>> as it makes sure all run-time dependencies are copied to the
>> target directory.
>>
> 
> OK.
> 
> So, again.
> 
> is
> 
>    make O=/tmp/kvm-selftest -C tools/testing/selftests \
>         TARGETS=kvm install INSTALL_PATH=/home/lxy/kvm-selftest
> 
> the right command for me to start on?
> 

Sorry for the delay. Yes the above command will work. Please check

https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git 
next branch

I fixed kvm build/cross-build problems and applied it to next for
testing.

https://patchwork.kernel.org/patch/11513471/

thanks,
-- Shuah