linux-kernel - [PATCH 0/4] KVM: x86/mmu: Bug fixes and cleanups in get_mmio

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Message-Id: <20201218003139.2167891-1-seanjc@google.com>
Date:   Thu, 17 Dec 2020 16:31:35 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ben Gardon <bgardon@...gle.com>,
        Richard Herbert <rherbert@...patico.ca>
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(-)

-- 
2.29.2.684.gfbc64c5ab5-goog