linux-kernel - Re: [PATCH v2 03/10] KVM: selftests: print a message when skipping KVM tests

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Date:   Mon, 24 May 2021 15:23:55 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>
Cc:     Aaron Lewis <aaronlewis@...gle.com>,
        Alexander Graf <graf@...zon.com>,
        Andrew Jones <drjones@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Emanuele Giuseppe Esposito <eesposit@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Jacob Xu <jacobhxu@...gle.com>,
        Makarand Sonare <makarandsonare@...gle.com>,
        Oliver Upton <oupton@...gle.com>, Peter Xu <peterx@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Yanan Wang <wangyanan55@...wei.com>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 03/10] KVM: selftests: print a message when skipping
 KVM tests

On 19/05/21 23:49, Ben Gardon wrote:
> On Wed, May 19, 2021 at 1:03 PM Axel Rasmussen <axelrasmussen@...gle.com> wrote:
>>
>> Previously, if this check failed, we'd just exit quietly with no output.
>> This can be confusing, so print out a short message indicating why the
>> test is being skipped.
>>
>> Signed-off-by: Axel Rasmussen <axelrasmussen@...gle.com>
> 
> Reviewed-by: Ben Gardon <bgardon@...gle.com>
> 
>> ---
>>   tools/testing/selftests/kvm/lib/kvm_util.c | 4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
>> index f05ca919cccb..0d6ddee429b9 100644
>> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
>> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
>> @@ -53,8 +53,10 @@ int kvm_check_cap(long cap)
>>          int kvm_fd;
>>
>>          kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
>> -       if (kvm_fd < 0)
>> +       if (kvm_fd < 0) {
>> +               print_skip("KVM not available, errno: %d", errno);
>>                  exit(KSFT_SKIP);
>> +       }
> 
> This is a wonderful change. I believe this will only be hit if KVM is
> built as a module and that module has not yet been loaded, so this
> message could also suggest that the user check if the KVM / KVM
> arch/vendor specific module has been loaded.

Let's make it

                 print_skip("%s not available, is KVM loaded? (errno: %d)",
                            KVM_DEV_PATH, errno);

Paolo