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KVM: Documentation: Update the field name gfns and its description in kvm_mmu_page

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Update the field 'gfns' in kvm_mmu_page to 'shadowed_translation' to be
consistent with the code. Also update the corresponding 'gfns' in the
comments. The more detailed description of 'shadowed_translation' is
already inlined in the data structure definition, so no need to duplicate
the text but simply just update the names.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230912184553.1887764-3-mizhang@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Mingwei Zhang 2023-09-12 18:45:49 +00:00 committed by Sean Christopherson
parent b207cfbc8c
commit fdaca560b6
1 changed files with 8 additions and 5 deletions
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13
Documentation/virt/kvm/x86/mmu.rst
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@ -221,11 +221,14 @@ Shadow pages contain the following information:
at __pa(sp2->spt). sp2 will point back at sp1 through parent_pte.
The spt array forms a DAG structure with the shadow page as a node, and
guest pages as leaves.
gfns:
An array of 512 guest frame numbers, one for each present pte. Used to
perform a reverse map from a pte to a gfn. When role.direct is set, any
element of this array can be calculated from the gfn field when used, in
this case, the array of gfns is not allocated. See role.direct and gfn.
shadowed_translation:
An array of 512 shadow translation entries, one for each present pte. Used
to perform a reverse map from a pte to a gfn as well as its access
permission. When role.direct is set, the shadow_translation array is not
allocated. This is because the gfn contained in any element of this array
can be calculated from the gfn field when used. In addition, when
role.direct is set, KVM does not track access permission for each of the
gfn. See role.direct and gfn.
root_count:
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