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Commit be593d62 authored by Xiao Guangrong's avatar Xiao Guangrong Committed by Avi Kivity
Browse files

KVM: introduce update_memslots function 



Introduce update_memslots to update slot which will be update to
kvm->memslots

Signed-off-by: default avatarXiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 93a5cef0

arch/x86/kvm/x86.c

+1 −1
Original line number Original line Diff line number Diff line
@@ -3546,7 +3546,7 @@ int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, 
		memslot = &slots->memslots[log->slot];

		memslot = &slots->memslots[log->slot];

		memslot->dirty_bitmap = dirty_bitmap;

		memslot->dirty_bitmap = dirty_bitmap;

		memslot->nr_dirty_pages = 0;

		memslot->nr_dirty_pages = 0;

		slots->generation++;

		update_memslots(slots, NULL);





		old_slots = kvm->memslots;

		old_slots = kvm->memslots;

		rcu_assign_pointer(kvm->memslots, slots);

		rcu_assign_pointer(kvm->memslots, slots);

include/linux/kvm_host.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -320,6 +320,7 @@ void kvm_exit(void); 




void kvm_get_kvm(struct kvm *kvm);

void kvm_get_kvm(struct kvm *kvm);

void kvm_put_kvm(struct kvm *kvm);

void kvm_put_kvm(struct kvm *kvm);

void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new);





static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)

static inline struct kvm_memslots *kvm_memslots(struct kvm *kvm)

{

{

virt/kvm/kvm_main.c

+15 −7
Original line number Original line Diff line number Diff line
@@ -630,6 +630,19 @@ static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot) 
}

}

#endif /* !CONFIG_S390 */

#endif /* !CONFIG_S390 */





void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)

{

	if (new) {

		int id = new->id;



		slots->memslots[id] = *new;

		if (id >= slots->nmemslots)

			slots->nmemslots = id + 1;

	}



	slots->generation++;

}



/*

/*

 * Allocate some memory and give it an address in the guest physical address

 * Allocate some memory and give it an address in the guest physical address

 * space.

 * space.
@@ -780,10 +793,8 @@ int __kvm_set_memory_region(struct kvm *kvm, 
				GFP_KERNEL);

				GFP_KERNEL);

		if (!slots)

		if (!slots)

			goto out_free;

			goto out_free;

		if (mem->slot >= slots->nmemslots)

			slots->nmemslots = mem->slot + 1;

		slots->generation++;

		slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;

		slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;

		update_memslots(slots, NULL);





		old_memslots = kvm->memslots;

		old_memslots = kvm->memslots;

		rcu_assign_pointer(kvm->memslots, slots);

		rcu_assign_pointer(kvm->memslots, slots);
@@ -815,9 +826,6 @@ int __kvm_set_memory_region(struct kvm *kvm, 
			GFP_KERNEL);

			GFP_KERNEL);

	if (!slots)

	if (!slots)

		goto out_free;

		goto out_free;

	if (mem->slot >= slots->nmemslots)

		slots->nmemslots = mem->slot + 1;

	slots->generation++;





	/* actual memory is freed via old in kvm_free_physmem_slot below */

	/* actual memory is freed via old in kvm_free_physmem_slot below */

	if (!npages) {

	if (!npages) {
@@ -827,7 +835,7 @@ int __kvm_set_memory_region(struct kvm *kvm, 
			new.lpage_info[i] = NULL;

			new.lpage_info[i] = NULL;

	}

	}





	slots->memslots[mem->slot] = new;

	update_memslots(slots, &new);

	old_memslots = kvm->memslots;

	old_memslots = kvm->memslots;

	rcu_assign_pointer(kvm->memslots, slots);

	rcu_assign_pointer(kvm->memslots, slots);

	synchronize_srcu_expedited(&kvm->srcu);

	synchronize_srcu_expedited(&kvm->srcu);