Re: [Tee-dev] [RFC v2 2/6] tee: enable support to register kernel memory

[Stuart Yoder <stuart.yoder@xxxxxxx>]

On 7/30/19 7:23 AM, Sumit Garg wrote:

> @@ -264,7 +266,17 @@ struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
>   		goto err;
>   	}
>   
> -	rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages);
> +	if (flags & TEE_SHM_USER_MAPPED) {
> +		rc = get_user_pages_fast(start, num_pages, FOLL_WRITE,
> +					 shm->pages);
> +	} else {
> +		const struct kvec kiov = {
> +			.iov_base = (void *)start,
> +			.iov_len = PAGE_SIZE
> +		};
> +
> +		rc = get_kernel_pages(&kiov, num_pages, 0, shm->pages);

Passing a single kvec struct is temporary I assume?  Because as currently
written this will only work with num_pages==1.

Stuart