Commit ad8cfbe3 authored by Marcelo Tosatti's avatar Marcelo Tosatti Committed by Avi Kivity
Browse files

KVM: MMU: mmu_parent_walk 



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

Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent a7052897

arch/x86/kvm/mmu.c

+27 −0
Original line number Diff line number Diff line
@@ -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)

{