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If dirty_log_test is run nested, it is possible for entries in the emulated PML log to appear before the actual memory write is committed to the RAM, due to the way KVM retries memory writes as a response to a MMU fault. In addition to that in some very rare cases retry can happen more than once, which will lead to the test failure because once the write is finally committed it may have a very outdated iteration value. Detect and avoid this case. Cc: Peter Xu <peterx@redhat.com> Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com> Link: https://lore.kernel.org/r/20250111003004.1235645-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>