| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.11 115/152] KVM: x86/mmu: Dont redundantly clear TDP MMU pt memory | Date | Mon, 5 Apr 2021 10:54:24 +0200 |
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From: Ben Gardon <bgardon@google.com>
[ 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@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: <20210202185734.1680553-5-bgardon@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- arch/x86/kvm/mmu/tdp_mmu.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c index 6bd86bb4c089..4a2b8844f00f 100644 --- a/arch/x86/kvm/mmu/tdp_mmu.c +++ b/arch/x86/kvm/mmu/tdp_mmu.c @@ -708,7 +708,6 @@ 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); -- 2.30.1
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