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powerpc64/bpf: fix kfunc call support

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Commit 61688a82e0 ("powerpc/bpf: enable kfunc call") inadvertently
enabled kfunc call support for 32-bit powerpc but that support will
not be possible until ABI mismatch between 32-bit powerpc and eBPF is
handled in 32-bit powerpc JIT code. Till then, advertise support only
for 64-bit powerpc. Also, in powerpc ABI, caller needs to extend the
arguments properly based on signedness. The JIT code is responsible
for handling this explicitly for kfunc calls as verifier can't handle
this for each architecture-specific ABI needs. But this was not taken
care of while kfunc call support was enabled for powerpc. Fix it by
handling this with bpf_jit_find_kfunc_model() and using zero_extend()
& sign_extend() helper functions.

Fixes: 61688a82e0 ("powerpc/bpf: enable kfunc call")
Cc: stable@vger.kernel.org
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260303181031.390073-7-hbathini@linux.ibm.com
This commit is contained in:
Hari Bathini
2026-03-03 23:40:30 +05:30
committed by Madhavan Srinivasan
parent 51b8de4b3d
commit 01b6ac7272
2 changed files with 94 additions and 9 deletions
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2
arch/powerpc/net/bpf_jit_comp.c
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@@ -450,7 +450,7 @@ bool bpf_jit_supports_subprog_tailcalls(void)
bool bpf_jit_supports_kfunc_call(void)
{
return true;
return IS_ENABLED(CONFIG_PPC64);
}
bool bpf_jit_supports_arena(void)