forked from Minki/linux
KVM: x86: MMU: Use clear_page() instead of init_shadow_page_table()
Not just in order to clean up the code, but to make it faster by using enhanced instructions: the initialization became 20-30% faster on our testing machine. Signed-off-by: Takuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -2041,14 +2041,6 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu,
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}
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}
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static void init_shadow_page_table(struct kvm_mmu_page *sp)
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{
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int i;
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for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
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sp->spt[i] = 0ull;
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}
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static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)
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{
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sp->write_flooding_count = 0;
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@ -2128,7 +2120,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
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account_shadowed(vcpu->kvm, sp);
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}
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sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;
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init_shadow_page_table(sp);
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clear_page(sp->spt);
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trace_kvm_mmu_get_page(sp, true);
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return sp;
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}
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