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

[Stuart Yoder]

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