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bpf, x64: Introduce two tailcall enhancements #4568

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bpf, x64: Introduce two tailcall enhancements #4568

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Pull request for series with
subject: bpf, x64: Introduce two tailcall enhancements
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=903824

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Upstream branch: c748a25
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=907401
version: 3

@Asphaltt
bpf, x64: Propagate tailcall info only for subprogs
a2a655b 
In x64 JIT, propagate tailcall info only for subprogs, not for helpers
or kfuncs.

Acked-by: Yonghong Song <[email protected]>
Signed-off-by: Leon Hwang <[email protected]>
@Asphaltt
bpf, verifier: Check trampoline target is tail_call_reachable subprog
39c8b0a 
In the x86_64 JIT, tailcall info is propagated through the trampoline when
the target program is tail_call_reachable. However, this propagation is
unnecessary if the target is a main prog, or a subprog that is not
tail_call_reachable.

Since the verifier can determine if a subprog is tail_call_reachable, it
should only propagate tailcall info when the target is subprog and the
subprog is actually tail_call_reachable.

Acked-by: Yonghong Song <[email protected]>
Signed-off-by: Leon Hwang <[email protected]>
@kernel-patches-daemon-bpf-rc kernel-patches-daemon-bpf-rc bot deleted the series/901404=>bpf-next branch November 15, 2024 09:20
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