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Re: [PATCH] [RFC] x86/cpu: rework instruction set selection
- To: Ingo Molnar <mingo@xxxxxxxxxx>
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Sat, 26 Apr 2025 17:35:49 -0700
- Cc: Arnd Bergmann <arnd@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, Arnd Bergmann <arnd@xxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Alexander Usyskin <alexander.usyskin@xxxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Mateusz Jończyk <mat.jonczyk@xxxxx>, "Mike Rapoport (Microsoft)" <rppt@xxxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Sun, 27 Apr 2025 00:36:32 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On April 26, 2025 11:55:50 AM PDT, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
>* H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
>> Dropping CMOV would mean dropping P5 support.
>
>Yeah, I think we should make the cutoff at the 686 level. Is there any
>strong reason not to do that? Stable kernels will still exist for a
>very long time for ancient boards.
>
> Ingo
I don't think some of the embedded 586-level ISA CPUs are ancient.
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