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

Sean Christopherson
2022-07-23T01:23:37Z

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