On Tue, Jan 12, 2021 at 4:43 PM Daniel Borkmann <dan...@iogearbox.net> wrote: > > On 1/12/21 4:35 PM, Gilad Reti wrote: > > On Tue, Jan 12, 2021 at 4:56 PM KP Singh <kpsi...@kernel.org> wrote: > >> On Tue, Jan 12, 2021 at 10:16 AM Gilad Reti <gilad.r...@gmail.com> wrote: > >>> > >>> Add test to check that the verifier is able to recognize spilling of > >>> PTR_TO_MEM registers. > >> > >> It would be nice to have some explanation of what the test does to > >> recognize the spilling of the PTR_TO_MEM registers in the commit > >> log as well. > >> > >> Would it be possible to augment an existing test_progs > >> program like tools/testing/selftests/bpf/progs/test_ringbuf.c to test > >> this functionality? > > How would you guarantee that LLVM generates the spill/fill, via inline asm?
Yeah, I guess there is no sure-shot way to do it and, adding inline asm would just be doing the same thing as this verifier test. You can ignore me on this one :) It would, however, be nice to have a better description about what the test is actually doing./ > > > It may be possible, but from what I understood from Daniel's comment here > > > > https://lore.kernel.org/bpf/17629073-4fab-a922-ecc3-25b019960...@iogearbox.net/ > > > > the test should be a part of the verifier tests (which is reasonable > > to me since it is > > a verifier bugfix) > > Yeah, the test_verifier case as you have is definitely the most straight > forward way to add coverage in this case.
