[PATCH v2 03/28] KVM: x86/mmu: Add lockdep when setting a TDP MMU SPTE

[Ben Gardon]

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@xxxxxxxxxx>
Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Acked-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Signed-off-by: Ben Gardon <bgardon@xxxxxxxxxx>
---
 arch/x86/kvm/mmu/tdp_mmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index 3d8cca238eba..b83a6a3ad29c 100644
--- 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,
-- 
2.30.0.365.g02bc693789-goog