Re: [PATCH bpf] x86/bpf: handle bpf-program-triggered exceptions properly

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Subject: Re: [PATCH bpf] x86/bpf: handle bpf-program-triggered exceptions properly
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Wed, 27 Jan 2021 10:30:56 +0100
Cc: bpf@xxxxxxxxxxxxxxx, Alexei Starovoitov <ast@xxxxxxxxxx>, Daniel Borkmann <daniel@xxxxxxxxxxxxx>, kernel-team@xxxxxx, x86@xxxxxxxxxx, KP Singh <kpsingh@xxxxxxxxxx>
In-reply-to: <66f46df5-8d47-8e4f-a6ab-ab794e57332d@fb.com>

On Tue, Jan 26, 2021 at 11:21:01AM -0800, Yonghong Song wrote:
> Do we have any x64 cpus which does not support X86_FEATURE_SMAP?

x64 is not an achitecture I know of. If you typoed x86_64 then sure, I
think SMAP is fairly recent, Wikipedia seems to suggest Broadwell and
later. AMD seems to sport it since Zen.

References:
- [PATCH bpf] x86/bpf: handle bpf-program-triggered exceptions properly
  - From: Yonghong Song
- Re: [PATCH bpf] x86/bpf: handle bpf-program-triggered exceptions properly
  - From: Peter Zijlstra
- Re: [PATCH bpf] x86/bpf: handle bpf-program-triggered exceptions properly
  - From: Yonghong Song

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