linux-kernel - Re: [RFC PATCH 6/8] KVM: x86: Implement kvm_arch_{, pre_}vcpu_map

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Date: Wed, 6 Mar 2024 16:36:25 -0800
From: David Matlack <dmatlack@...gle.com>
To: isaku.yamahata@...el.com
Cc: kvm@...r.kernel.org, isaku.yamahata@...il.com, 
	linux-kernel@...r.kernel.org, Sean Christopherson <seanjc@...gle.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Michael Roth <michael.roth@....com>, 
	Federico Parola <federico.parola@...ito.it>
Subject: Re: [RFC PATCH 6/8] KVM: x86: Implement kvm_arch_{, pre_}vcpu_map_memory()

On Wed, Mar 6, 2024 at 4:31 PM David Matlack <dmatlack@...gle.com> wrote:
>
> On 2024-03-01 09:28 AM, isaku.yamahata@...el.com 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?