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Date:   Thu, 17 Dec 2020 16:31:35 -0800
From:   Sean Christopherson <>
To:     Paolo Bonzini <>
Cc:     Sean Christopherson <>,
        Vitaly Kuznetsov <>,
        Wanpeng Li <>,
        Jim Mattson <>,
        Joerg Roedel <>,,, Ben Gardon <>,
        Richard Herbert <>
Subject: [PATCH 0/4] KVM: x86/mmu: Bug fixes and cleanups in get_mmio_spte()

Two fixes for bugs that were introduced along with the TDP MMU (though I
strongly suspect only the one reported by Richard, fixed in patch 2/4, is
hittable in practice).  Two additional cleanup on top to try and make the
code a bit more readable and shave a few cycles.

Sean Christopherson (4):
  KVM: x86/mmu: Use -1 to flag an undefined spte in get_mmio_spte()
  KVM: x86/mmu: Get root level from walkers when retrieving MMIO SPTE
  KVM: x86/mmu: Use raw level to index into MMIO walks' sptes array
  KVM: x86/mmu: Optimize not-present/MMIO SPTE check in get_mmio_spte()

 arch/x86/kvm/mmu/mmu.c     | 53 +++++++++++++++++++++-----------------
 arch/x86/kvm/mmu/tdp_mmu.c |  9 ++++---
 arch/x86/kvm/mmu/tdp_mmu.h |  4 ++-
 3 files changed, 39 insertions(+), 27 deletions(-)


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