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    Subject[PATCH RFC v8 04/56] KVM: Add HVA range operator
    Date
    From: Vishal Annapurve <vannapurve@google.com>

    Introduce HVA range operator so that other KVM subsystems
    can operate on HVA range.

    Signed-off-by: Vishal Annapurve <vannapurve@google.com>
    [mdr: minor checkpatch alignment fixups]
    Signed-off-by: Michael Roth <michael.roth@amd.com>
    ---
    include/linux/kvm_host.h | 6 +++++
    virt/kvm/kvm_main.c | 48 ++++++++++++++++++++++++++++++++++++++++
    2 files changed, 54 insertions(+)

    diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
    index 4d542060cd93..c615650ed256 100644
    --- a/include/linux/kvm_host.h
    +++ b/include/linux/kvm_host.h
    @@ -1402,6 +1402,12 @@ void kvm_mmu_invalidate_begin(struct kvm *kvm);
    void kvm_mmu_invalidate_range_add(struct kvm *kvm, gfn_t start, gfn_t end);
    void kvm_mmu_invalidate_end(struct kvm *kvm);

    +typedef int (*kvm_hva_range_op_t)(struct kvm *kvm,
    + struct kvm_gfn_range *range, void *data);
    +
    +int kvm_vm_do_hva_range_op(struct kvm *kvm, unsigned long hva_start,
    + unsigned long hva_end, kvm_hva_range_op_t handler, void *data);
    +
    long kvm_arch_dev_ioctl(struct file *filp,
    unsigned int ioctl, unsigned long arg);
    long kvm_arch_vcpu_ioctl(struct file *filp,
    diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
    index f7e00593cc5d..4ccd655dd5af 100644
    --- a/virt/kvm/kvm_main.c
    +++ b/virt/kvm/kvm_main.c
    @@ -642,6 +642,54 @@ static __always_inline int __kvm_handle_hva_range(struct kvm *kvm,
    return (int)ret;
    }

    +int kvm_vm_do_hva_range_op(struct kvm *kvm, unsigned long hva_start,
    + unsigned long hva_end, kvm_hva_range_op_t handler, void *data)
    +{
    + int ret = 0;
    + struct kvm_gfn_range gfn_range;
    + struct kvm_memory_slot *slot;
    + struct kvm_memslots *slots;
    + int i, idx;
    +
    + if (WARN_ON_ONCE(hva_end <= hva_start))
    + return -EINVAL;
    +
    + idx = srcu_read_lock(&kvm->srcu);
    +
    + for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
    + struct interval_tree_node *node;
    +
    + slots = __kvm_memslots(kvm, i);
    + kvm_for_each_memslot_in_hva_range(node, slots,
    + hva_start, hva_end - 1) {
    + unsigned long start, end;
    +
    + slot = container_of(node, struct kvm_memory_slot,
    + hva_node[slots->node_idx]);
    + start = max(hva_start, slot->userspace_addr);
    + end = min(hva_end, slot->userspace_addr +
    + (slot->npages << PAGE_SHIFT));
    +
    + /*
    + * {gfn(page) | page intersects with [hva_start, hva_end)} =
    + * {gfn_start, gfn_start+1, ..., gfn_end-1}.
    + */
    + gfn_range.start = hva_to_gfn_memslot(start, slot);
    + gfn_range.end = hva_to_gfn_memslot(end + PAGE_SIZE - 1, slot);
    + gfn_range.slot = slot;
    +
    + ret = handler(kvm, &gfn_range, data);
    + if (ret)
    + goto e_ret;
    + }
    + }
    +
    +e_ret:
    + srcu_read_unlock(&kvm->srcu, idx);
    +
    + return ret;
    +}
    +
    static __always_inline int kvm_handle_hva_range(struct mmu_notifier *mn,
    unsigned long start,
    unsigned long end,
    --
    2.25.1
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