linux-kernel - Re: [PATCH v3 2/2] selftests: KVM: use dirty logging to check if page stats work correctly

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Date:   Tue, 31 Aug 2021 16:58:44 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     Mingwei Zhang <mizhang@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        David Matlack <dmatlack@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v3 2/2] selftests: KVM: use dirty logging to check if
 page stats work correctly

On Mon, Aug 30, 2021, Ben Gardon wrote:
> On Sun, Aug 29, 2021 at 9:44 PM Mingwei Zhang <mizhang@...gle.com> wrote:
> > diff --git a/tools/testing/selftests/kvm/lib/test_util.c b/tools/testing/selftests/kvm/lib/test_util.c
> > index af1031fed97f..07eb6b5c125e 100644
> > --- a/tools/testing/selftests/kvm/lib/test_util.c
> > +++ b/tools/testing/selftests/kvm/lib/test_util.c
> > @@ -15,6 +15,13 @@
> >  #include "linux/kernel.h"
> >
> >  #include "test_util.h"
> > +#include "processor.h"
> > +
> > +static const char * const pagestat_filepaths[] = {
> > +       "/sys/kernel/debug/kvm/pages_4k",
> > +       "/sys/kernel/debug/kvm/pages_2m",
> > +       "/sys/kernel/debug/kvm/pages_1g",
> > +};
> 
> I think these should only be defined for x86_64 too. Is this the right
> file for these definitions or is there an arch specific file they
> should go in?

The stats also need to be pulled from the selftest's VM, not from the overall KVM
stats, otherwise the test will fail if there are any other active VMs on the host,
e.g. I like to run to selftests and kvm-unit-tests in parallel.