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Commit 38e3b2b2 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
Browse files

KVM: MMU: cleanup for kvm_mmu_page_unlink_children 



Cleanup the same operation between kvm_mmu_page_unlink_children and
mmu_pte_write_zap_pte

Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 67052b35

arch/x86/kvm/mmu.c

+23 −43
Original line number Diff line number Diff line
@@ -1566,32 +1566,33 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep, 
	}

}



static void kvm_mmu_page_unlink_children(struct kvm *kvm,

					 struct kvm_mmu_page *sp)

static void mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,

			     u64 *spte)

{

	unsigned i;

	u64 *pt;

	u64 ent;



	pt = sp->spt;



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

		ent = pt[i];

	u64 pte;

	struct kvm_mmu_page *child;



		if (is_shadow_present_pte(ent)) {

			if (!is_last_spte(ent, sp->role.level)) {

				ent &= PT64_BASE_ADDR_MASK;

				mmu_page_remove_parent_pte(page_header(ent),

							   &pt[i]);

			} else {

				if (is_large_pte(ent))

					--kvm->stat.lpages;

				drop_spte(kvm, &pt[i],

					  shadow_trap_nonpresent_pte);

	pte = *spte;

	if (is_shadow_present_pte(pte)) {

		if (is_last_spte(pte, sp->role.level))

			drop_spte(kvm, spte, shadow_trap_nonpresent_pte);

		else {

			child = page_header(pte & PT64_BASE_ADDR_MASK);

			mmu_page_remove_parent_pte(child, spte);

		}

	}

		pt[i] = shadow_trap_nonpresent_pte;

	__set_spte(spte, shadow_trap_nonpresent_pte);

	if (is_large_pte(pte))

		--kvm->stat.lpages;

}



static void kvm_mmu_page_unlink_children(struct kvm *kvm,

					 struct kvm_mmu_page *sp)

{

	unsigned i;



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

		mmu_page_zap_pte(kvm, sp, sp->spt + i);

}



static void kvm_mmu_put_page(struct kvm_mmu_page *sp, u64 *parent_pte)
@@ -3069,27 +3070,6 @@ void kvm_mmu_unload(struct kvm_vcpu *vcpu) 
}

EXPORT_SYMBOL_GPL(kvm_mmu_unload);



static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,

				  struct kvm_mmu_page *sp,

				  u64 *spte)

{

	u64 pte;

	struct kvm_mmu_page *child;



	pte = *spte;

	if (is_shadow_present_pte(pte)) {

		if (is_last_spte(pte, sp->role.level))

			drop_spte(vcpu->kvm, spte, shadow_trap_nonpresent_pte);

		else {

			child = page_header(pte & PT64_BASE_ADDR_MASK);

			mmu_page_remove_parent_pte(child, spte);

		}

	}

	__set_spte(spte, shadow_trap_nonpresent_pte);

	if (is_large_pte(pte))

		--vcpu->kvm->stat.lpages;

}



static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,

				  struct kvm_mmu_page *sp, u64 *spte,

				  const void *new)
@@ -3271,7 +3251,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa, 
		spte = &sp->spt[page_offset / sizeof(*spte)];

		while (npte--) {

			entry = *spte;

			mmu_pte_write_zap_pte(vcpu, sp, spte);

			mmu_page_zap_pte(vcpu->kvm, sp, spte);

			if (gentry &&

			      !((sp->role.word ^ vcpu->arch.mmu.base_role.word)

			      & mask.word))