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Support kCFI + BPF on arm64 #9301

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Pull request for series with
subject: Support kCFI + BPF on arm64
version: 10
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708

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Upstream branch: e860a98
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 1f48966
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 62ef449
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0768e98
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0768e98
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0768e98
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0768e98
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0ee30d9
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 0ee30d9
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=982708
version: 10

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Upstream branch: 42be23e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=983905
version: 11

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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=983905 expired. Closing PR.

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Upstream branch: 42be23e
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=984449
version: 12

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Upstream branch: 95993dc
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=984449
version: 12

mrutland-arm and others added 3 commits July 22, 2025 14:02
@mrutland-arm
cfi: add C CFI type macro
bc4d51e 
Currently x86 and riscv open-code 4 instances of the same logic to
define a u32 variable with the KCFI typeid of a given function.

Replace the duplicate logic with a common macro.

Signed-off-by: Mark Rutland <[email protected]>
Co-developed-by: Maxwell Bland <[email protected]>
Signed-off-by: Maxwell Bland <[email protected]>
Co-developed-by: Sami Tolvanen <[email protected]>
Signed-off-by: Sami Tolvanen <[email protected]>
Tested-by: Dao Huang <[email protected]>
Acked-by: Will Deacon <[email protected]>
@samitolvanen
cfi: Move BPF CFI types and helpers to generic code
aaa8ca5 
Instead of duplicating the same code for each architecture, move
the CFI type hash variables for BPF function types and related
helper functions to generic CFI code, and allow architectures to
override the function definitions if needed.

Signed-off-by: Sami Tolvanen <[email protected]>
@puranjaymohan
arm64/cfi,bpf: Support kCFI + BPF on arm64
7b92960 
Currently, bpf_dispatcher_*_func() is marked with `__nocfi` therefore
calling BPF programs from this interface doesn't cause CFI warnings.

When BPF programs are called directly from C: from BPF helpers or
struct_ops, CFI warnings are generated.

Implement proper CFI prologues for the BPF programs and callbacks and
drop __nocfi for arm64. Fix the trampoline generation code to emit kCFI
prologue when a struct_ops trampoline is being prepared.

Signed-off-by: Puranjay Mohan <[email protected]>
Co-developed-by: Maxwell Bland <[email protected]>
Signed-off-by: Maxwell Bland <[email protected]>
Co-developed-by: Sami Tolvanen <[email protected]>
Signed-off-by: Sami Tolvanen <[email protected]>
Tested-by: Dao Huang <[email protected]>
Acked-by: Will Deacon <[email protected]>
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Upstream branch: 95993dc
series: https://patchwork.kernel.org/project/netdevbpf/list/?series=984880
version: 13

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@mrutland-arm @samitolvanen @puranjaymohan