KVM: x86/mmu: Add lockdep when setting a TDP MMU SPTE

Add lockdep to __tdp_mmu_set_spte to ensure that SPTEs are only modified
under the MMU lock.

No functional change intended.

Reviewed-by: Peter Feiner <pfeiner@google.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20210202185734.1680553-4-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index ef3d3e058fa05d80eb1156fb2397ac28c09e8157..05e6e2c4554fbf6b6f276ab2c79fb824cc599f14 100644 (file)
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -381,6 +381,8 @@ static inline void __tdp_mmu_set_spte(struct kvm *kvm, struct tdp_iter *iter,
        struct kvm_mmu_page *root = sptep_to_sp(root_pt);
        int as_id = kvm_mmu_page_as_id(root);
 
+       lockdep_assert_held(&kvm->mmu_lock);
+
        WRITE_ONCE(*iter->sptep, new_spte);
 
        __handle_changed_spte(kvm, as_id, iter->gfn, iter->old_spte, new_spte,