Re: [PATCH v2 3/6] KVM: Documentation: Add the missing description for ptep in kvm_mmu_page

[Huang, Kai]

On Mon, 2023-06-26 at 18:20 +0000, Mingwei Zhang wrote:
> Add the missing description for ptep in kvm_mmu_page description. ptep is
> used when TDP MMU is enabled and it shares the storage with parent_ptes.
> Update the doc to help readers to get up-to-date info.
> 
> Signed-off-by: Mingwei Zhang <mizhang@xxxxxxxxxx>
> ---
>  Documentation/virt/kvm/x86/mmu.rst | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/virt/kvm/x86/mmu.rst b/Documentation/virt/kvm/x86/mmu.rst
> index 4c9044b4dc6c..5cd6cd5e8926 100644
> --- a/Documentation/virt/kvm/x86/mmu.rst
> +++ b/Documentation/virt/kvm/x86/mmu.rst
> @@ -237,6 +237,11 @@ Shadow pages contain the following information:
>      parent_ptes points at this single spte, otherwise, there exists multiple
>      sptes pointing at this page and (parent_ptes & ~0x1) points at a data
>      structure with a list of parent sptes.
> +  ptep:
> +    The reverse mapping for the pte pointing at this page's spt. This field is
> +    used in replace of parent_ptes when TDP MMU is used. In TDP MMU, each
> +    non-root shadow page will have one parent, while each root shadow page has
> +    no parent. Note that this field is a union with parent_ptes.
>    unsync:
>      If true, then the translations in this page may not match the guest's
>      translation.  This is equivalent to the state of the tlb when a pte is
> -- 
> 2.41.0.162.gfafddb0af9-goog
> 

Reviewed-by: Kai Huang <kai.huang@xxxxxxxxx>