Marcelo Tosatti <mtosa...@redhat.com> wrote:
> guest fault enable dirty logging
>
> tdp_page_fault (all _page_fault functions) kvm_set_memory_region
>
>
> level = mapping_level(vcpu, gfn)
> (finds level == 2 or 3)
>
>
> rcu_assign_pointer(slot
> with
>
> ->dirty_bitmap)
> synchronize_srcu_expedited()
Isn't here still in the SRCU read-side critical section?
> schedule()
>
> kvm_arch_commit_memory_region()
> spin_lock(mmu_lock)
>
> kvm_mmu_slot_remove_write_access()
> removes large sptes
> spin_unlock(mmu_lock)
> spin_lock(mmu_lock)
> create large spte accordingly
> to level above
> spin_unlock(mmu_lock)
>
If so, we cannot start kvm_arch_commit_memory_region() until the completion
of the SRCU critical section and this race will not happen.
Takuya
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