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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230618000856.1714902-7-mizhang@google.com>
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.
+
 
 Reverse map
 ===========
-- 
2.41.0.162.gfafddb0af9-goog