Re: [PATCH 5/6] powerpc64/bpf: Support exceptions - Linux-kselftest-mirror

12 Jan 2026


      Le 12/01/2026 à 07:58, adubey a écrit :
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On 2026-01-12 11:21, Saket Kumar Bhaskar wrote:
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On Mon, Jan 05, 2026 at 04:22:11PM +0530, adubey@linux.ibm.com wrote:
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From: Abhishek Dubey adubey@linux.ibm.com
The modified prologue/epilogue generation code now
enables exception-callback to use the stack frame of
the program marked as exception boundary, where callee
saved registers are stored.
As per ppc64 ABIv2 documentation[1], r14-r31 are callee
saved registers. BPF programs on ppc64 already saves
r26-r31 registers. Saving the remaining set of callee
saved registers(r14-r25) is handled in the next patch.
[1]
https://eur01.safelinks.protection.outlook.com/? 
url=https%3A%2F%2Fftp.rtems.org%2Fpub%2Frtems%2Fpeople%2Fsebh%2FABI64BitOpenPOWERv1.1_16July2015_pub.pdf&data=05%7C02%7Cchristophe.leroy%40csgroup.eu%7Cdecf1943ac9949608edb08de51a7f357%7C8b87af7d86474dc78df45f69a2011bb5%7C0%7C0%7C639037978954052961%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=uCfpmnY2bQT7yD3esp8nkyLPGfEzpK9UoCgV2sm0j80%3D&reserved=0
Following is exceptions selftest result on ppc64le:
# ./test_progs -t exceptions
#100/1   exceptions/exception_throw_always_1:OK
#100/2   exceptions/exception_throw_always_2:OK
#100/3   exceptions/exception_throw_unwind_1:OK
#100/4   exceptions/exception_throw_unwind_2:OK
#100/5   exceptions/exception_throw_default:OK
#100/6   exceptions/exception_throw_default_value:OK
#100/7   exceptions/exception_tail_call:OK
#100/8   exceptions/exception_ext:OK
#100/9   exceptions/exception_ext_mod_cb_runtime:OK
#100/10  exceptions/exception_throw_subprog:OK
#100/11  exceptions/exception_assert_nz_gfunc:OK
#100/12  exceptions/exception_assert_zero_gfunc:OK
#100/13  exceptions/exception_assert_neg_gfunc:OK
#100/14  exceptions/exception_assert_pos_gfunc:OK
#100/15  exceptions/exception_assert_negeq_gfunc:OK
#100/16  exceptions/exception_assert_poseq_gfunc:OK
#100/17  exceptions/exception_assert_nz_gfunc_with:OK
#100/18  exceptions/exception_assert_zero_gfunc_with:OK
#100/19  exceptions/exception_assert_neg_gfunc_with:OK
#100/20  exceptions/exception_assert_pos_gfunc_with:OK
#100/21  exceptions/exception_assert_negeq_gfunc_with:OK
#100/22  exceptions/exception_assert_poseq_gfunc_with:OK
#100/23  exceptions/exception_bad_assert_nz_gfunc:OK
#100/24  exceptions/exception_bad_assert_zero_gfunc:OK
#100/25  exceptions/exception_bad_assert_neg_gfunc:OK
#100/26  exceptions/exception_bad_assert_pos_gfunc:OK
#100/27  exceptions/exception_bad_assert_negeq_gfunc:OK
#100/28  exceptions/exception_bad_assert_poseq_gfunc:OK
#100/29  exceptions/exception_bad_assert_nz_gfunc_with:OK
#100/30  exceptions/exception_bad_assert_zero_gfunc_with:OK
#100/31  exceptions/exception_bad_assert_neg_gfunc_with:OK
#100/32  exceptions/exception_bad_assert_pos_gfunc_with:OK
#100/33  exceptions/exception_bad_assert_negeq_gfunc_with:OK
#100/34  exceptions/exception_bad_assert_poseq_gfunc_with:OK
#100/35  exceptions/exception_assert_range:OK
#100/36  exceptions/exception_assert_range_with:OK
#100/37  exceptions/exception_bad_assert_range:OK
#100/38  exceptions/exception_bad_assert_range_with:OK
#100/39  exceptions/non-throwing fentry -> exception_cb:OK
#100/40  exceptions/throwing fentry -> exception_cb:OK
#100/41  exceptions/non-throwing fexit -> exception_cb:OK
#100/42  exceptions/throwing fexit -> exception_cb:OK
#100/43  exceptions/throwing extension (with custom cb) ->
exception_cb:OK
#100/44  exceptions/throwing extension -> global func in
exception_cb:OK
#100/45  exceptions/exception_ext_mod_cb_runtime:OK
#100/46  exceptions/throwing extension (with custom cb) -> global func
in exception_cb:OK
#100/47  exceptions/exception_ext:OK
#100/48  exceptions/non-throwing fentry -> non-throwing subprog:OK
#100/49  exceptions/throwing fentry -> non-throwing subprog:OK
#100/50  exceptions/non-throwing fentry -> throwing subprog:OK
#100/51  exceptions/throwing fentry -> throwing subprog:OK
#100/52  exceptions/non-throwing fexit -> non-throwing subprog:OK
#100/53  exceptions/throwing fexit -> non-throwing subprog:OK
#100/54  exceptions/non-throwing fexit -> throwing subprog:OK
#100/55  exceptions/throwing fexit -> throwing subprog:OK
#100/56  exceptions/non-throwing fmod_ret -> non-throwing subprog:OK
#100/57  exceptions/non-throwing fmod_ret -> non-throwing global
subprog:OK
#100/58  exceptions/non-throwing extension -> non-throwing subprog:OK
#100/59  exceptions/non-throwing extension -> throwing subprog:OK
#100/60  exceptions/non-throwing extension -> non-throwing subprog:OK
#100/61  exceptions/non-throwing extension -> throwing global
subprog:OK
#100/62  exceptions/throwing extension -> throwing global subprog:OK
#100/63  exceptions/throwing extension -> non-throwing global
subprog:OK
#100/64  exceptions/non-throwing extension -> main subprog:OK
#100/65  exceptions/throwing extension -> main subprog:OK
#100/66  exceptions/reject_exception_cb_type_1:OK
#100/67  exceptions/reject_exception_cb_type_2:OK
#100/68  exceptions/reject_exception_cb_type_3:OK
#100/69  exceptions/reject_exception_cb_type_4:OK
#100/70  exceptions/reject_async_callback_throw:OK
#100/71  exceptions/reject_with_lock:OK
#100/72  exceptions/reject_subprog_with_lock:OK
#100/73  exceptions/reject_with_rcu_read_lock:OK
#100/74  exceptions/reject_subprog_with_rcu_read_lock:OK
#100/75  exceptions/reject_with_rbtree_add_throw:OK
#100/76  exceptions/reject_with_reference:OK
#100/77  exceptions/reject_with_cb_reference:OK
#100/78  exceptions/reject_with_cb:OK
#100/79  exceptions/reject_with_subprog_reference:OK
#100/80  exceptions/reject_throwing_exception_cb:OK
#100/81  exceptions/reject_exception_cb_call_global_func:OK
#100/82  exceptions/reject_exception_cb_call_static_func:OK
#100/83  exceptions/reject_multiple_exception_cb:OK
#100/84  exceptions/reject_exception_throw_cb:OK
#100/85  exceptions/reject_exception_throw_cb_diff:OK
#100/86  exceptions/reject_set_exception_cb_bad_ret1:OK
#100/87  exceptions/reject_set_exception_cb_bad_ret2:OK
#100/88  exceptions/check_assert_eq_int_min:OK
#100/89  exceptions/check_assert_eq_int_max:OK
#100/90  exceptions/check_assert_eq_zero:OK
#100/91  exceptions/check_assert_eq_llong_min:OK
#100/92  exceptions/check_assert_eq_llong_max:OK
#100/93  exceptions/check_assert_lt_pos:OK
#100/94  exceptions/check_assert_lt_zero:OK
#100/95  exceptions/check_assert_lt_neg:OK
#100/96  exceptions/check_assert_le_pos:OK
#100/97  exceptions/check_assert_le_zero:OK
#100/98  exceptions/check_assert_le_neg:OK
#100/99  exceptions/check_assert_gt_pos:OK
#100/100 exceptions/check_assert_gt_zero:OK
#100/101 exceptions/check_assert_gt_neg:OK
#100/102 exceptions/check_assert_ge_pos:OK
#100/103 exceptions/check_assert_ge_zero:OK
#100/104 exceptions/check_assert_ge_neg:OK
#100/105 exceptions/check_assert_range_s64:OK
#100/106 exceptions/check_assert_range_u64:OK
#100/107 exceptions/check_assert_single_range_s64:OK
#100/108 exceptions/check_assert_single_range_u64:OK
#100/109 exceptions/check_assert_generic:OK
#100/110 exceptions/check_assert_with_return:OK
#100     exceptions:OK
Summary: 1/110 PASSED, 0 SKIPPED, 0 FAILED
It would be great to include this selftest output in the cover letter
instead, since it makes the git log excessively long.
Thanks,
Saket
Major contributors in the community routinely include test case results
in commit messages, and this is not viewed as problematic.
Eg: bpf-next : e59997d9052599feb17419289f2a57ed300e1dfa,
This is a merge commit, the message comes from the cover letter of the 
series: 
https://lore.kernel.org/all/20240201125225.72796-1-puranjay12@gmail.com/
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6c17a882d3804dce1c66e1fec25f96d39a184067
In this one the list of tests is rather small compared to the entire 
commit message.
So I also recommend to move this big list of tests in the cover letter.
Christophe