linux-kernel - [PATCH 0/9] KVM: x86/mmu: Clean up MMU

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Message-ID: <20230511235917.639770-1-seanjc@google.com>
Date:   Thu, 11 May 2023 16:59:08 -0700
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,
        Mingwei Zhang <mizhang@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 0/9] KVM: x86/mmu: Clean up MMU_DEBUG and BUG/WARN usage

This series consist of three loosely related miniseries:

 1. Remove the noisy prints buried behind MMU_DEBUG, and replace MMU_DEBUG
    with a KVM_PROVE_MMU Kconfig.

 2. Use WARN_ON_ONCE() for all runtime WARNs, i.e. avoid spamming the
    kernel log if something goes awry in the MMU.

 3. Demote BUG() usage in the shadow MMU to KVM_BUG_ON() when the kernel
    is built with CONFIG_BUG_ON_DATA_CORRUPTION=n.

The three things aren't directly dependent on each other, but there are
minor conflicts, and more importantly I want to have a single series for
discussing how we want the MMU to behave when things go sideways.

Mingwei Zhang (1):
  KVM: x86/mmu: Plumb "struct kvm" all the way to pte_list_remove()

Sean Christopherson (8):
  KVM: x86/mmu: Delete pgprintk() and all its usage
  KVM: x86/mmu: Delete rmap_printk() and all its usage
  KVM: x86/mmu: Delete the "dbg" module param
  KVM: x86/mmu: Rename MMU_WARN_ON() to KVM_MMU_WARN_ON()
  KVM: x86/mmu: Convert "runtime" WARN_ON() assertions to WARN_ON_ONCE()
  KVM: x86/mmu: Bug the VM if a vCPU ends up in long mode without PAE
    enabled
  KVM: x86/mmu: Replace MMU_DEBUG with proper KVM_PROVE_MMU Kconfig
  KVM: x86/mmu: BUG() in rmap helpers iff
    CONFIG_BUG_ON_DATA_CORRUPTION=y

 arch/x86/kvm/Kconfig            |  13 +++
 arch/x86/kvm/mmu/mmu.c          | 144 +++++++++++++-------------------
 arch/x86/kvm/mmu/mmu_internal.h |  14 +---
 arch/x86/kvm/mmu/page_track.c   |  16 ++--
 arch/x86/kvm/mmu/paging_tmpl.h  |  16 ++--
 arch/x86/kvm/mmu/spte.c         |   6 +-
 arch/x86/kvm/mmu/spte.h         |   8 +-
 arch/x86/kvm/mmu/tdp_iter.c     |   4 +-
 arch/x86/kvm/mmu/tdp_mmu.c      |  28 +++----
 include/linux/kvm_host.h        |  19 +++++
 10 files changed, 127 insertions(+), 141 deletions(-)


base-commit: 5c291b93e5d665380dbecc6944973583f9565ee5
-- 
2.40.1.606.ga4b1b128d6-goog