linux-kernel - [PATCH 3/6] KVM: Documentation: Add the missing ptep in kvm_mmu

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Message-ID: <20230618000856.1714902-4-mizhang@google.com>
Date:   Sun, 18 Jun 2023 00:08:53 +0000
From:   Mingwei Zhang <mizhang@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mingwei Zhang <mizhang@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [PATCH 3/6] KVM: Documentation: Add the missing ptep in kvm_mmu_page

Add the missing 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@...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 149dd3cba48f..36bfe0fe02bb 100644
--- a/Documentation/virt/kvm/x86/mmu.rst
+++ b/Documentation/virt/kvm/x86/mmu.rst
@@ -236,6 +236,10 @@ 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:
+    Pointer to the parent spte when TDP MMU is enabled. In TDP MMU, each
+    shadow page will have at most one 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