From c435d4b7badfa791fea2a1a97a07e02e7134a150 Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 3 Nov 2021 09:18:33 -0700 Subject: KVM: x86/mmu: Properly dereference rcu-protected TDP MMU sptep iterator Wrap the read of iter->sptep in tdp_mmu_map_handle_target_level() with rcu_dereference(). Shadow pages in the TDP MMU, and thus their SPTEs, are protected by rcu. This fixes a Sparse warning at tdp_mmu.c:900:51: warning: incorrect type in argument 1 (different address spaces) expected unsigned long long [usertype] *sptep got unsigned long long [noderef] [usertype] __rcu *[usertype] sptep Fixes: 7158bee4b475 ("KVM: MMU: pass kvm_mmu_page struct to make_spte") Cc: Ben Gardon Signed-off-by: Sean Christopherson Message-Id: <20211103161833.3769487-1-seanjc@google.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/mmu/tdp_mmu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch') diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 7c5dd83e52de..a54c3491af42 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -897,7 +897,7 @@ static int tdp_mmu_map_handle_target_level(struct kvm_vcpu *vcpu, struct kvm_page_fault *fault, struct tdp_iter *iter) { - struct kvm_mmu_page *sp = sptep_to_sp(iter->sptep); + struct kvm_mmu_page *sp = sptep_to_sp(rcu_dereference(iter->sptep)); u64 new_spte; int ret = RET_PF_FIXED; bool wrprot = false; -- cgit v1.2.3