Re: [RFC PATCH 6/8] KVM: x86: Implement kvm_arch_{, pre_}vcpu_map_memory()

[David Matlack <dmatlack@xxxxxxxxxx>]

On Wed, Mar 6, 2024 at 4:31 PM David Matlack <dmatlack@xxxxxxxxxx> wrote:
>
> On 2024-03-01 09:28 AM, isaku.yamahata@xxxxxxxxx wrote:
> >
> > +     if (IS_ALIGNED(mapping->base_gfn, KVM_PAGES_PER_HPAGE(PG_LEVEL_1G)) &&
> > +         mapping->nr_pages >= KVM_PAGES_PER_HPAGE(PG_LEVEL_1G))
> > +             max_level = PG_LEVEL_1G;
> > +     else if (IS_ALIGNED(mapping->base_gfn, KVM_PAGES_PER_HPAGE(PG_LEVEL_2M)) &&
> > +              mapping->nr_pages >= KVM_PAGES_PER_HPAGE(PG_LEVEL_2M))
> > +             max_level = PG_LEVEL_2M;
> > +     else
> > +             max_level = PG_LEVEL_4K;
>
> Is there a requirement that KVM must not map memory outside of the
> requested region?

And if so, what if the requested region is already mapped with a larger page?