Commit 1bad2b2a authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Paolo Bonzini
Browse files

KVM: MMU: introduce slot_handle_level_range() and its helpers 



There are several places walking all rmaps for the memslot so that
introduce common functions to cleanup the code

Signed-off-by: default avatarXiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 6ce1f4e2

arch/x86/kvm/mmu.c

+69 −0
Original line number Diff line number Diff line
@@ -4454,6 +4454,75 @@ void kvm_mmu_setup(struct kvm_vcpu *vcpu) 
	init_kvm_mmu(vcpu);

}



/* The return value indicates if tlb flush on all vcpus is needed. */

typedef bool (*slot_level_handler) (struct kvm *kvm, unsigned long *rmap);



/* The caller should hold mmu-lock before calling this function. */

static bool

slot_handle_level_range(struct kvm *kvm, struct kvm_memory_slot *memslot,

			slot_level_handler fn, int start_level, int end_level,

			gfn_t start_gfn, gfn_t end_gfn, bool lock_flush_tlb)

{

	struct slot_rmap_walk_iterator iterator;

	bool flush = false;



	for_each_slot_rmap_range(memslot, start_level, end_level, start_gfn,

			end_gfn, &iterator) {

		if (iterator.rmap)

			flush |= fn(kvm, iterator.rmap);



		if (need_resched() || spin_needbreak(&kvm->mmu_lock)) {

			if (flush && lock_flush_tlb) {

				kvm_flush_remote_tlbs(kvm);

				flush = false;

			}

			cond_resched_lock(&kvm->mmu_lock);

		}

	}



	if (flush && lock_flush_tlb) {

		kvm_flush_remote_tlbs(kvm);

		flush = false;

	}



	return flush;

}



static bool

slot_handle_level(struct kvm *kvm, struct kvm_memory_slot *memslot,

		  slot_level_handler fn, int start_level, int end_level,

		  bool lock_flush_tlb)

{

	return slot_handle_level_range(kvm, memslot, fn, start_level,

			end_level, memslot->base_gfn,

			memslot->base_gfn + memslot->npages - 1,

			lock_flush_tlb);

}



static bool

slot_handle_all_level(struct kvm *kvm, struct kvm_memory_slot *memslot,

		      slot_level_handler fn, bool lock_flush_tlb)

{

	return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL,

				 PT_MAX_HUGEPAGE_LEVEL, lock_flush_tlb);

}



static bool

slot_handle_large_level(struct kvm *kvm, struct kvm_memory_slot *memslot,

			slot_level_handler fn, bool lock_flush_tlb)

{

	return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL + 1,

				 PT_MAX_HUGEPAGE_LEVEL, lock_flush_tlb);

}



static bool

slot_handle_leaf(struct kvm *kvm, struct kvm_memory_slot *memslot,

		 slot_level_handler fn, bool lock_flush_tlb)

{

	return slot_handle_level(kvm, memslot, fn, PT_PAGE_TABLE_LEVEL,

				 PT_PAGE_TABLE_LEVEL, lock_flush_tlb);

}



void kvm_mmu_slot_remove_write_access(struct kvm *kvm,

				      struct kvm_memory_slot *memslot)

{