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Date: Fri, 16 Oct 2015 17:05:13 +0900 From: Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp> To: pbonzini@...hat.com Cc: kvm@...r.kernel.org, linux-kernel@...r.kernel.org Subject: [PATCH 2/5] KVM: x86: MMU: Simplify force_pt_level calculation code in FNAME(page_fault)() As a bonus, an extra memory slot search can be eliminated when is_self_change_mapping is true. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp> --- arch/x86/kvm/paging_tmpl.h | 15 +++++++-------- 1 file changed, 7 insertions(+), 8 deletions(-) diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h index 07f1a4e..8ebc3a5 100644 --- a/arch/x86/kvm/paging_tmpl.h +++ b/arch/x86/kvm/paging_tmpl.h @@ -743,15 +743,14 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr, u32 error_code, is_self_change_mapping = FNAME(is_self_change_mapping)(vcpu, &walker, user_fault, &vcpu->arch.write_fault_to_shadow_pgtable); - if (walker.level >= PT_DIRECTORY_LEVEL) - force_pt_level = mapping_level_dirty_bitmap(vcpu, walker.gfn) - || is_self_change_mapping; - else + if (walker.level >= PT_DIRECTORY_LEVEL && !is_self_change_mapping) { + force_pt_level = mapping_level_dirty_bitmap(vcpu, walker.gfn); + if (!force_pt_level) { + level = min(walker.level, mapping_level(vcpu, walker.gfn)); + walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1); + } + } else force_pt_level = true; - if (!force_pt_level) { - level = min(walker.level, mapping_level(vcpu, walker.gfn)); - walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1); - } mmu_seq = vcpu->kvm->mmu_notifier_seq; smp_rmb(); -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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