Re: [RFC][PATCH RFC 10/12] KVM: move dirty bitmaps to user space

[Takuya Yoshikawa]

> >   	r = 0;
> > @@ -1195,11 +1232,16 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
> >   	gfn = unalias_gfn(kvm, gfn);
> >   	memslot = gfn_to_memslot_unaliased(kvm, gfn);
> >   	if (memslot&&  memslot->dirty_bitmap) {
> > -		unsigned long rel_gfn = gfn - memslot->base_gfn;
> > +		int nr = generic_le_bit_offset(gfn - memslot->base_gfn);
> >
> > -		generic___set_le_bit(rel_gfn, memslot->dirty_bitmap);
> > +		if (kvm_set_bit_user(nr, memslot->dirty_bitmap))
> > +			goto out_fault;
>
> mark_page_dirty is called with the mmu_lock spinlock held in set_spte.
> Must find a way to move it outside of the spinlock section.

Oh, it's a serious problem. I have to consider it.


Thanks,
  Takuya
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