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Commit 77492664 authored by Takuya Yoshikawa's avatar Takuya Yoshikawa Committed by Paolo Bonzini
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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: default avatarTakuya Yoshikawa <yoshikawa_takuya_b1@lab.ntt.co.jp>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 481d2bcc

arch/x86/kvm/mmu.c

+1 −9
Original line number Diff line number Diff line
@@ -2041,14 +2041,6 @@ static void mmu_sync_children(struct kvm_vcpu *vcpu, 
	}

}



static void init_shadow_page_table(struct kvm_mmu_page *sp)

{

	int i;



	for (i = 0; i < PT64_ENT_PER_PAGE; ++i)

		sp->spt[i] = 0ull;

}



static void __clear_sp_write_flooding_count(struct kvm_mmu_page *sp)

{

	sp->write_flooding_count = 0;
@@ -2128,7 +2120,7 @@ static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu, 
		account_shadowed(vcpu->kvm, sp);

	}

	sp->mmu_valid_gen = vcpu->kvm->arch.mmu_valid_gen;

	init_shadow_page_table(sp);

	clear_page(sp->spt);

	trace_kvm_mmu_get_page(sp, true);

	return sp;

}