linux-kernel - Re: [PATCH V5 0/2] selftests: KVM: Add a test for eager page splitting

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Message-ID: <CABgObfYAStAC5FgJfGUiJ=BBFtN7drD+NGHLFJY5fP3hQzVOBw@mail.gmail.com>
Date:   Tue, 14 Mar 2023 15:23:01 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Vipin Sharma <vipinsh@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>
Subject: Re: [PATCH V5 0/2] selftests: KVM: Add a test for eager page splitting

On Tue, Mar 14, 2023 at 2:27 PM Paolo Bonzini <pbonzini@...hat.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)
==== Test Assertion Failure ====
  x86_64/dirty_log_page_splitting_test.c:195: __a == __b
  pid=1378203 tid=1378203 errno=0 - Success
     1    0x0000000000402d02: run_test at dirty_log_page_splitting_test.c:195
     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