linux-kernel - Re: [PATCH 6/6] KVM: Documentation: Add the missing tdp_mmu_page into kvm_mmu

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Date:   Mon, 26 Jun 2023 17:59:54 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     "Huang, Kai" <kai.huang@...el.com>
Cc:     "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "jmattson@...gle.com" <jmattson@...gle.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dmatlack@...gle.com" <dmatlack@...gle.com>,
        "bgardon@...gle.com" <bgardon@...gle.com>
Subject: Re: [PATCH 6/6] KVM: Documentation: Add the missing tdp_mmu_page
 into kvm_mmu_page

On Thu, Jun 22, 2023, Huang, Kai wrote:
> On Sun, 2023-06-18 at 00:08 +0000, Mingwei Zhang wrote:
> > Add tdp_mmu_page into kvm_mmu_page description. tdp_mmu_page is a field to
> > differentiate shadow pages from TDP MMU and non-TDP MMU. When TDP MMU is
> > enabled, sp->tdp_mmu_page=1 indicates a shadow page for L1, while
> > sp->tdp_mmu_page=0 indicates a shadow page for an L2. When TDP MMU is
> > disabled, sp->tdp_mmu_page is always 0. So update the doc to reflect the
> > information.
> > 
> > Signed-off-by: Mingwei Zhang <mizhang@...gle.com>
> > ---
> >  Documentation/virt/kvm/x86/mmu.rst | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst
> > index 0dbdb7fb8cc6..cbad49c37629 100644
> > --- a/Documentation/virt/kvm/x86/mmu.rst
> > +++ b/Documentation/virt/kvm/x86/mmu.rst
> > @@ -277,6 +277,10 @@ Shadow pages contain the following information:
> >      since the last time the page table was actually used; if emulation
> >      is triggered too frequently on this page, KVM will unmap the page
> >      to avoid emulation in the future.
> > +  tdp_mmu_page:
> > +    Is 1 if the shadow page is a TDP MMU page. When TDP MMU is disabled,
> > +    this field is always 0.
> > +
> > 
> 
> Hmm.. Again I think "TDP MMU is disabled" is a little bit confusing, but maybe
> it's only me having this impression.
> 
> I think you can just delete the second sentence.

It is not confusing but redundant in this case. I will delete it in next
version.