@@ -918,6 +918,8 @@ int pnv_npu2_handle_fault(struct npu_context *context, uintptr_t *ea,
u64 rc = 0, result = 0;
int i, is_write;
struct page *page[1];
+ const char __user *u;
+ char c;
/* mmap_sem should be held so the struct_mm must be present */
struct mm_struct *mm = context->mm;
@@ -930,18 +932,17 @@ int pnv_npu2_handle_fault(struct npu_context *context, uintptr_t *ea,
is_write ? FOLL_WRITE : 0,
page, NULL, NULL);
- /*
- * To support virtualised environments we will have to do an
- * access to the page to ensure it gets faulted into the
- * hypervisor. For the moment virtualisation is not supported in
- * other areas so leave the access out.
- */
if (rc != 1) {
status[i] = rc;
result = -EFAULT;
continue;
}
+ /* Make sure partition scoped tree gets a pte */
+ u = page_address(page[0]);
+ if (__get_user(c, u))
+ result = -EFAULT;
+
status[i] = 0;
put_page(page[0]);
}