This is a note to let you know that I've just added the patch titled KVM: x86/mmu: Don't redundantly clear TDP MMU pt memory to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-x86-mmu-don-t-redundantly-clear-tdp-mmu-pt-memor.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit 7ad0aa324fd19e916eae8be382c98efee1b759c6 Author: Ben Gardon <bgardon@xxxxxxxxxx> Date: Tue Feb 2 10:57:10 2021 -0800 KVM: x86/mmu: Don't redundantly clear TDP MMU pt memory [ Upstream commit 734e45b329d626d2c14e2bcf8be3d069a33c3316 ] The KVM MMU caches already guarantee that shadow page table memory will be zeroed, so there is no reason to re-zero the page in the TDP MMU page fault handler. 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> Message-Id: <20210202185734.1680553-5-bgardon@xxxxxxxxxx> Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index f88404033e0c..136311be5890 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -706,7 +706,6 @@ int kvm_tdp_mmu_map(struct kvm_vcpu *vcpu, gpa_t gpa, u32 error_code, sp = alloc_tdp_mmu_page(vcpu, iter.gfn, iter.level); list_add(&sp->link, &vcpu->kvm->arch.tdp_mmu_pages); child_pt = sp->spt; - clear_page(child_pt); new_spte = make_nonleaf_spte(child_pt, !shadow_accessed_mask);