linux-kernel - [PATCH v2 0/6] KVM: x86: Apply NX mitigation more precisely

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Message-Id: <20220723012325.1715714-1-seanjc@google.com>
Date:   Sat, 23 Jul 2022 01:23:19 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yosry Ahmed <yosryahmed@...gle.com>,
        Mingwei Zhang <mizhang@...gle.com>,
        Ben Gardon <bgardon@...gle.com>
Subject: [PATCH v2 0/6] KVM: x86: Apply NX mitigation more precisely

Patch 6 from Mingwei is the end goal of the series.  KVM incorrectly
assumes that the NX huge page mitigation is the only scenario where KVM
will create a non-leaf page instead of a huge page.   Precisely track
(via kvm_mmu_page) if a non-huge page is being forced and use that info
to avoid unnecessarily forcing smaller page sizes in
disallowed_hugepage_adjust().

v2: Rebase, tweak a changelog accordingly.

v1: https://lore.kernel.org/all/20220409003847.819686-1-seanjc@google.com

Mingwei Zhang (1):
  KVM: x86/mmu: explicitly check nx_hugepage in
    disallowed_hugepage_adjust()

Sean Christopherson (5):
  KVM: x86/mmu: Tag disallowed NX huge pages even if they're not tracked
  KVM: x86/mmu: Properly account NX huge page workaround for nonpaging
    MMUs
  KVM: x86/mmu: Set disallowed_nx_huge_page in TDP MMU before setting
    SPTE
  KVM: x86/mmu: Track the number of TDP MMU pages, but not the actual
    pages
  KVM: x86/mmu: Add helper to convert SPTE value to its shadow page

 arch/x86/include/asm/kvm_host.h |  17 ++---
 arch/x86/kvm/mmu/mmu.c          | 107 ++++++++++++++++++++++----------
 arch/x86/kvm/mmu/mmu_internal.h |  41 +++++++-----
 arch/x86/kvm/mmu/paging_tmpl.h  |   6 +-
 arch/x86/kvm/mmu/spte.c         |  11 ++++
 arch/x86/kvm/mmu/spte.h         |  17 +++++
 arch/x86/kvm/mmu/tdp_mmu.c      |  49 +++++++++------
 arch/x86/kvm/mmu/tdp_mmu.h      |   2 +
 8 files changed, 167 insertions(+), 83 deletions(-)


base-commit: 1a4d88a361af4f2e91861d632c6a1fe87a9665c2
-- 
2.37.1.359.gd136c6c3e2-goog