Re: [RFC PATCH v3 06/19] KVM: x86: mmu: add gfn_in_memslot helper

[Maxim Levitsky]

On Thu, 2022-05-19 at 16:43 +0000, Sean Christopherson wrote:
> On Wed, Apr 27, 2022, Maxim Levitsky wrote:
> > This is a tiny refactoring, and can be useful to check
> > if a GPA/GFN is within a memslot a bit more cleanly.
> 
> This doesn't explain the actual motivation, which is to use the new helper from
> arch code.
I'll add this in the next version
> 
> > Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
> > ---
> >  include/linux/kvm_host.h | 10 +++++++++-
> >  1 file changed, 9 insertions(+), 1 deletion(-)
> > 
> > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > index 252ee4a61b58b..12e261559070b 100644
> > --- a/include/linux/kvm_host.h
> > +++ b/include/linux/kvm_host.h
> > @@ -1580,6 +1580,13 @@ int kvm_request_irq_source_id(struct kvm *kvm);
> >  void kvm_free_irq_source_id(struct kvm *kvm, int irq_source_id);
> >  bool kvm_arch_irqfd_allowed(struct kvm *kvm, struct kvm_irqfd *args);
> >  
> > +
> > +static inline bool gfn_in_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
> > +{
> > +	return (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages);
> > +}
> > +
> 
> Spurious newline.
> 
> > +
> >  /*
> >   * Returns a pointer to the memslot if it contains gfn.
> >   * Otherwise returns NULL.
> > @@ -1590,12 +1597,13 @@ try_get_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
> >  	if (!slot)
> >  		return NULL;
> >  
> > -	if (gfn >= slot->base_gfn && gfn < slot->base_gfn + slot->npages)
> > +	if (gfn_in_memslot(slot, gfn))
> >  		return slot;
> >  	else
> >  		return NULL;
> 
> At this point, maybe:

No objections.

Thanks for the review.

Best regards,
	Maxim Levitsky

> 
> 	if (!slot || !gfn_in_memslot(slot, gfn))
> 		return NULL;
> 
> 	return slot;
> 
> >  }
> >  
> > +
> >  /*
> >   * Returns a pointer to the memslot that contains gfn. Otherwise returns NULL.
> >   *
> > -- 
> > 2.26.3
> >