!7655 v3 KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()

		goto e_free;

	}

	region->uaddr = range->addr;

	region->size = range->size;

	list_add_tail(&region->list, &sev->regions_list);

	mutex_unlock(&kvm->lock);

	/*

	 * The guest may change the memory encryption attribute from C=0 -> C=1

	 * or vice versa for this memory range. Lets make sure caches are

	 * flushed to ensure that guest data gets written into memory with

	 * correct C-bit.

	 * correct C-bit.  Note, this must be done before dropping kvm->lock,

	 * as region and its array of pages can be freed by a different task

	 * once kvm->lock is released.

	 */

	sev_clflush_pages(region->pages, region->npages);

	region->uaddr = range->addr;

	region->size = range->size;

	list_add_tail(&region->list, &sev->regions_list);

	mutex_unlock(&kvm->lock);

	return ret;

e_free: