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From:   Paolo Bonzini <pbonzini@redhat.com>
Date:   Tue, 14 Mar 2023 15:23:01 +0100
Message-ID: <CABgObfYAStAC5FgJfGUiJ=BBFtN7drD+NGHLFJY5fP3hQzVOBw@mail.gmail.com>
Subject: Re: [PATCH V5 0/2] selftests: KVM: Add a test for eager page splitting
To:     Ben Gardon <bgardon@google.com>
Cc:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
        Peter Xu <peterx@redhat.com>,
        Sean Christopherson <seanjc@google.com>,
        David Matlack <dmatlack@google.com>,
        Vipin Sharma <vipinsh@google.com>,
        Ricardo Koller <ricarkol@google.com>
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On Tue, Mar 14, 2023 at 2:27=E2=80=AFPM Paolo Bonzini <pbonzini@redhat.com>=
 wrote:
> I have finally queued it, but made a small change to allow running it
> with non-hugetlbfs page types.

Oops, it fails on my AMD workstation:

$ tools/testing/selftests/kvm/x86_64/dirty_log_page_splitting_test
Testing guest mode: PA-bits:ANY, VA-bits:48,  4K pages
guest physical test memory: [0x7fc7fe00000, 0x7fcffe00000)
=3D=3D=3D=3D Test Assertion Failure =3D=3D=3D=3D
  x86_64/dirty_log_page_splitting_test.c:195: __a =3D=3D __b
  pid=3D1378203 tid=3D1378203 errno=3D0 - Success
     1    0x0000000000402d02: run_test at dirty_log_page_splitting_test.c:1=
95
     2    0x000000000040367c: for_each_guest_mode at guest_modes.c:100
     3    0x00000000004024df: main at dirty_log_page_splitting_test.c:245
     4    0x00007f4227c3feaf: ?? ??:0
     5    0x00007f4227c3ff5f: ?? ??:0
     6    0x0000000000402594: _start at ??:?
  ASSERT_EQ(stats_populated.pages_4k, stats_repopulated.pages_4k) failed.
    stats_populated.pages_4k is 0x413
    stats_repopulated.pages_4k is 0x412

Haven't debugged it yet.

Paolo