[PATCH v3 00/12] KVM: x86/mmu: Clean up MMU_DEBUG and BUG/WARN usage

[Sean Christopherson <seanjc@google.com>]

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.

v3:
 - Fix build errors related to is_empty_shadow_page (which the bot has
   told me about several times, and I managed to forget every other
   time...) [kernel test robot]

v2:
 - https://lore.kernel.org/all/20230721230006.2337941-1-seanjc@google.com
 - Collect a review. [Mingwei]
 - Call out the more obvious path to FNAME(walk_addr_generic) in patch 6. [David]
 - Use BUILD_BUG_ON_INVALID() for the stub. [David]

v1: https://lore.kernel.org/all/20230511235917.639770-1-seanjc@google.com

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

Sean Christopherson (11):
  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: Avoid pointer arithmetic when iterating over SPTEs
  KVM: x86/mmu: Cleanup sanity check of SPTEs at SP free
  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: Use BUILD_BUG_ON_INVALID() for KVM_MMU_WARN_ON() stub
  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          | 163 +++++++++++++-------------------
 arch/x86/kvm/mmu/mmu_internal.h |  14 +--
 arch/x86/kvm/mmu/page_track.c   |  16 ++--
 arch/x86/kvm/mmu/paging_tmpl.h  |  23 +++--
 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, 143 insertions(+), 151 deletions(-)


base-commit: fdf0eaf11452d72945af31804e2a1048ee1b574c
-- 
2.41.0.487.g6d72f3e995-goog