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KVM: MMU: cleanup for dropping parent pte 

Introduce drop_parent_pte to remove the rmap of parent pte and
clear parent pte

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Xiao Guangrong 2011-05-15 23:28:29 +08:00 committed by Avi Kivity
parent 38e3b2b28c
commit bcdd9a93c5
1 changed files with 12 additions and 9 deletions
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21
arch/x86/kvm/mmu.c
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@ -1084,6 +1084,13 @@ static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp,
pte_list_remove(parent_pte, &sp->parent_ptes);
}
static void drop_parent_pte(struct kvm_mmu_page *sp,
u64 *parent_pte)
{
mmu_page_remove_parent_pte(sp, parent_pte);
__set_spte(parent_pte, shadow_trap_nonpresent_pte);
}
static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
u64 *parent_pte, int direct)
{
@ -1560,8 +1567,7 @@ static void validate_direct_spte(struct kvm_vcpu *vcpu, u64 *sptep,
if (child->role.access == direct_access)
return;
mmu_page_remove_parent_pte(child, sptep);
__set_spte(sptep, shadow_trap_nonpresent_pte);
drop_parent_pte(child, sptep);
kvm_flush_remote_tlbs(vcpu->kvm);
}
}
@ -1578,7 +1584,7 @@ static void mmu_page_zap_pte(struct kvm *kvm, struct kvm_mmu_page *sp,
drop_spte(kvm, spte, shadow_trap_nonpresent_pte);
else {
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, spte);
drop_parent_pte(child, spte);
}
}
__set_spte(spte, shadow_trap_nonpresent_pte);
@ -1613,10 +1619,8 @@ static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
{
u64 *parent_pte;
while ((parent_pte = pte_list_next(&sp->parent_ptes, NULL))) {
kvm_mmu_put_page(sp, parent_pte);
__set_spte(parent_pte, shadow_trap_nonpresent_pte);
}
while ((parent_pte = pte_list_next(&sp->parent_ptes, NULL)))
drop_parent_pte(sp, parent_pte);
}
static int mmu_zap_unsync_children(struct kvm *kvm,
@ -2046,8 +2050,7 @@ static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
u64 pte = *sptep;
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, sptep);
__set_spte(sptep, shadow_trap_nonpresent_pte);
drop_parent_pte(child, sptep);
kvm_flush_remote_tlbs(vcpu->kvm);
} else if (pfn != spte_to_pfn(*sptep)) {
pgprintk("hfn old %llx new %llx\n",