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    Subject[PATCH 7/9] KVM: MMU: introduce kvm_zap_gfn_range()
    Date
    From: Xiao Guangrong <guangrong.xiao@linux.intel.com>

    It is used to zap all the rmaps of the specified gfn range and will
    be used by the later patch

    Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
    ---
    arch/x86/kvm/mmu.c | 30 ++++++++++++++++++++++++++++++
    arch/x86/kvm/mmu.h | 1 +
    2 files changed, 31 insertions(+)

    diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
    index 5d90a22..aa9aad0 100644
    --- a/arch/x86/kvm/mmu.c
    +++ b/arch/x86/kvm/mmu.c
    @@ -4520,6 +4520,36 @@ slot_handle_leaf(struct kvm *kvm, struct kvm_memory_slot *memslot,
    PT_PAGE_TABLE_LEVEL, lock_flush_tlb);
    }

    +void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end)
    +{
    + struct kvm_memslots *slots;
    + struct kvm_memory_slot *memslot;
    + bool flush = false;
    +
    + slots = kvm_memslots(kvm);
    +
    + spin_lock(&kvm->mmu_lock);
    + kvm_for_each_memslot(memslot, slots) {
    + gfn_t start, end;
    +
    + start = max(gfn_start, memslot->base_gfn);
    + end = min(gfn_end, memslot->base_gfn + memslot->npages);
    + if (start >= end)
    + continue;
    +
    + flush |= slot_handle_level_range(kvm, memslot, kvm_zap_rmapp,
    + PT_PAGE_TABLE_LEVEL,
    + PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES - 1,
    + start, end - 1, true);
    + }
    +
    + if (flush)
    + kvm_flush_remote_tlbs(kvm);
    + spin_unlock(&kvm->mmu_lock);
    +
    +}
    +EXPORT_SYMBOL_GPL(kvm_zap_gfn_range);
    +
    static bool slot_rmap_write_protect(struct kvm *kvm, unsigned long *rmapp)
    {
    return __rmap_write_protect(kvm, rmapp, false);
    diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
    index c7d6563..44b75f3 100644
    --- a/arch/x86/kvm/mmu.h
    +++ b/arch/x86/kvm/mmu.h
    @@ -170,4 +170,5 @@ static inline bool permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
    }

    void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm);
    +void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end);
    #endif
    --
    1.9.3


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