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    SubjectRe: [PATCH V4 2/15] KVM/MMU: Add tlb flush with range helper function
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    > On 13 Oct 2018, at 17:53, lantianyu1986@gmail.com wrote:
    >
    > From: Lan Tianyu <Tianyu.Lan@microsoft.com>
    >
    > This patch is to add wrapper functions for tlb_remote_flush_with_range
    > callback.
    >
    > Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
    > ---
    > Change sicne V3:
    > Remove code of updating "tlbs_dirty"
    > Change since V2:
    > Fix comment in the kvm_flush_remote_tlbs_with_range()
    > ---
    > arch/x86/kvm/mmu.c | 40 ++++++++++++++++++++++++++++++++++++++++
    > 1 file changed, 40 insertions(+)
    >
    > diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
    > index c73d9f650de7..ff656d85903a 100644
    > --- a/arch/x86/kvm/mmu.c
    > +++ b/arch/x86/kvm/mmu.c
    > @@ -264,6 +264,46 @@ static void mmu_spte_set(u64 *sptep, u64 spte);
    > static union kvm_mmu_page_role
    > kvm_mmu_calc_root_page_role(struct kvm_vcpu *vcpu);
    >
    > +
    > +static inline bool kvm_available_flush_tlb_with_range(void)
    > +{
    > + return kvm_x86_ops->tlb_remote_flush_with_range;
    > +}

    Seems that kvm_available_flush_tlb_with_range() is not used in this patch…

    > +
    > +static void kvm_flush_remote_tlbs_with_range(struct kvm *kvm,
    > + struct kvm_tlb_range *range)
    > +{
    > + int ret = -ENOTSUPP;
    > +
    > + if (range && kvm_x86_ops->tlb_remote_flush_with_range)
    > + ret = kvm_x86_ops->tlb_remote_flush_with_range(kvm, range);
    > +
    > + if (ret)
    > + kvm_flush_remote_tlbs(kvm);
    > +}
    > +
    > +static void kvm_flush_remote_tlbs_with_list(struct kvm *kvm,
    > + struct list_head *flush_list)
    > +{
    > + struct kvm_tlb_range range;
    > +
    > + range.flush_list = flush_list;
    > +
    > + kvm_flush_remote_tlbs_with_range(kvm, &range);
    > +}
    > +
    > +static void kvm_flush_remote_tlbs_with_address(struct kvm *kvm,
    > + u64 start_gfn, u64 pages)
    > +{
    > + struct kvm_tlb_range range;
    > +
    > + range.start_gfn = start_gfn;
    > + range.pages = pages;
    > + range.flush_list = NULL;
    > +
    > + kvm_flush_remote_tlbs_with_range(kvm, &range);
    > +}
    > +
    > void kvm_mmu_set_mmio_spte_mask(u64 mmio_mask, u64 mmio_value)
    > {
    > BUG_ON((mmio_mask & mmio_value) != mmio_value);
    > --
    > 2.14.4
    >

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