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SubjectRe: [PATCH v2 4/6] KVM: Documentation: Add the missing description for tdp_mmu_root_count into kvm_mmu_page
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On Mon, 2023-06-26 at 18:20 +0000, Mingwei Zhang wrote:
> Add the description of tdp_mmu_root_count into kvm_mmu_page description.
> tdp_mmu_root_count is an atomic counter used only in TDP MMU. Its usage and
> meaning is slightly different with root_counter in shadow MMU. Update the
> doc.
>
> Signed-off-by: Mingwei Zhang <mizhang@google.com>
> ---
> 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 5cd6cd5e8926..97d695207e11 100644
> --- a/Documentation/virt/kvm/x86/mmu.rst
> +++ b/Documentation/virt/kvm/x86/mmu.rst
> @@ -231,6 +231,11 @@ Shadow pages contain the following information:
> A counter keeping track of how many hardware registers (guest cr3 or
> pdptrs) are now pointing at the page. While this counter is nonzero, the
> page cannot be destroyed. See role.invalid.
> + tdp_mmu_root_count:
> + An atomic reference counter in TDP MMU root page that allows for parallel
> + accesses. Accessing the page requires lifting the counter value. The
> + initial value is set to 2 indicating one reference from vCPU and one
> + from TDP MMU itself. Note this field is a union with root_count.
> parent_ptes:
> The reverse mapping for the pte/ptes pointing at this page's spt. If
> parent_ptes bit 0 is zero, only one spte points at this page and
> --
> 2.41.0.162.gfafddb0af9-goog
>

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