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KVM: MMU: mmu_parent_walk

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Introduce a function to walk all parents of a given page, invoking a handler.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Marcelo Tosatti 2008-09-23 13:18:36 -03:00 committed by Avi Kivity
parent a7052897b3
commit ad8cfbe3ff
1 changed files with 27 additions and 0 deletions
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27
arch/x86/kvm/mmu.c
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@ -147,6 +147,8 @@ struct kvm_shadow_walk {
u64 addr, u64 *spte, int level);
};
typedef int (*mmu_parent_walk_fn) (struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp);
static struct kmem_cache *pte_chain_cache;
static struct kmem_cache *rmap_desc_cache;
static struct kmem_cache *mmu_page_header_cache;
@ -862,6 +864,31 @@ static void mmu_page_remove_parent_pte(struct kvm_mmu_page *sp,
BUG();
}
static void mmu_parent_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
mmu_parent_walk_fn fn)
{
struct kvm_pte_chain *pte_chain;
struct hlist_node *node;
struct kvm_mmu_page *parent_sp;
int i;
if (!sp->multimapped && sp->parent_pte) {
parent_sp = page_header(__pa(sp->parent_pte));
fn(vcpu, parent_sp);
mmu_parent_walk(vcpu, parent_sp, fn);
return;
}
hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link)
for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) {
if (!pte_chain->parent_ptes[i])
break;
parent_sp = page_header(__pa(pte_chain->parent_ptes[i]));
fn(vcpu, parent_sp);
mmu_parent_walk(vcpu, parent_sp, fn);
}
}
static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp)
{