> +void vm_set_memory_encryption(struct kvm_vm *vm, bool enc_by_default, bool has_enc_bit,
> + uint8_t enc_bit)
> +{
> + vm->memcrypt.enabled = true;
> + vm->memcrypt.enc_by_default = enc_by_default;
> + vm->memcrypt.has_enc_bit = has_enc_bit;
> + vm->memcrypt.enc_bit = enc_bit;
> +}
> +
> +struct sparsebit *
> +vm_get_encrypted_phy_pages(struct kvm_vm *vm, int slot, vm_paddr_t *gpa_start,
> + uint64_t *size)
> +{
> + struct userspace_mem_region *region;
> + struct sparsebit *encrypted_phy_pages;
> +
> + if (!vm->memcrypt.enabled)
> + return NULL;
> +
> + region = memslot2region(vm, slot);
> + if (!region)
> + return NULL;
> +
> + encrypted_phy_pages = sparsebit_alloc();
> + sparsebit_copy(encrypted_phy_pages, region->encrypted_phy_pages);
Do we have to make a copy for the sparsebit? Why not just return the
pointer? By looking at your subsequent patches, I find that this data
structure seems to be just read-only?
-Mingwei
