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    Subject[PATCH v2 09/16] KVM: MMU: fast mmu_need_write_protect path for hard mmu
    On direct mmu without nested, all the page is not write-protected by
    shadow page table protection

    Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
    ---
    arch/x86/kvm/mmu.c | 3 +++
    1 files changed, 3 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
    index 53e92de..0c6e92d 100644
    --- a/arch/x86/kvm/mmu.c
    +++ b/arch/x86/kvm/mmu.c
    @@ -2293,6 +2293,9 @@ static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
    struct hlist_node *node;
    bool need_unsync = false;

    + if (!vcpu->kvm->arch.indirect_shadow_pages)
    + return 0;
    +
    for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn, node) {
    if (!can_unsync)
    return 1;
    --
    1.7.7.6


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