Re: [PATCH v2 6/6] selftests/sgx: Add a bpftrace script for tracking allocation errors

Reinette Chatre
2022-08-31T20:09:47Z

Hi Jarkko,

On 8/31/2022 10:38 AM, Jarkko Sakkinen wrote:
> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
> ---
> v2:
> * Added comments.
> ---
> tools/testing/selftests/sgx/alloc-error.bt | 9 +++++++++
> 1 file changed, 9 insertions(+)
> create mode 100644 tools/testing/selftests/sgx/alloc-error.bt
>
> diff --git a/tools/testing/selftests/sgx/alloc-error.bt b/tools/testing/selftests/sgx/alloc-error.bt
> new file mode 100644
> index 000000000000..0cc8b2e41852
> --- /dev/null
> +++ b/tools/testing/selftests/sgx/alloc-error.bt
> @@ -0,0 +1,9 @@
> +/* EPC allocation */
> +kr:sgx_alloc_epc_page /(uint64)retval >= (uint64)(-4095)/ {
> + printf("sgx_alloc_epc_page: retval=%d\n", (int64)retval);
> +}
> +
> +/* kzalloc for struct sgx_encl_page */
> +kr:sgx_encl_page_alloc /(uint64)retval >= (uint64)(-4095)/ {
> + printf("sgx_encl_page_alloc: retval=%d\n", (int64)retval);
> +}

I did see you response in [1]. I continue to find this
addition very cryptic in that it assumes global familiarity
with BPF scripting which I do not think can be assumed. I
still think this script can benefit from a comment to describe
what the script does and how to use it.

Reinette

[1] https://lore.kernel.org/linux-sgx/Yw+nCBVYfueEXVZK@kernel.org/