• Sean Christopherson's avatar
    KVM: x86/mmu: Don't set dirty bits when disabling dirty logging w/ PML · b6e16ae5
    Sean Christopherson authored
    Stop setting dirty bits for MMU pages when dirty logging is disabled for
    a memslot, as PML is now completely disabled when there are no memslots
    with dirty logging enabled.
    This means that spurious PML entries will be created for memslots with
    dirty logging disabled if at least one other memslot has dirty logging
    enabled.  However, spurious PML entries are already possible since
    dirty bits are set only when a dirty logging is turned off, i.e. memslots
    that are never dirty logged will have dirty bits cleared.
    In the end, it's faster overall to eat a few spurious PML entries in the
    window where dirty logging is being disabled across all memslots.
    Signed-off-by: default avatarSean Christopherson <seanjc@google.com>
    Message-Id: <20210213005015.1651772-13-seanjc@google.com>
    Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>