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

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Date:   Sun, 18 Jun 2023 00:08:56 +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 6/6] KVM: Documentation: Add the missing tdp_mmu_page into kvm_mmu_page

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.
+
 
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