Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives

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To: Dave Hansen <dave.hansen@xxxxxxxxx>
Subject: Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 11 Jul 2024 10:16:28 +0200
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, Josh Poimboeuf <jpoimboe@xxxxxxxxxx>, Xiongwei Song <xiongwei.song@xxxxxxxxxxxxx>, Xin Li <xin3.li@xxxxxxxxx>, "Mike Rapoport (IBM)" <rppt@xxxxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, Michael Roth <michael.roth@xxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Alexey Kardashevskiy <aik@xxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Sohil Mehta <sohil.mehta@xxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Pawan Gupta <pawan.kumar.gupta@xxxxxxxxxxxxxxx>, Daniel Sneddon <daniel.sneddon@xxxxxxxxxxxxxxx>, Kai Huang <kai.huang@xxxxxxxxx>, Sandipan Das <sandipan.das@xxxxxxx>, Breno Leitao <leitao@xxxxxxxxxx>, Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>, Yian Chen <yian.chen@xxxxxxxxx>, Alexei Starovoitov <ast@xxxxxxxxxx>, Hou Tao <houtao1@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Vegard Nossum <vegard.nossum@xxxxxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Eric Biggers <ebiggers@xxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, "Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Luis Chamberlain <mcgrof@xxxxxxxxxx>, Yuntao Wang <ytcoode@xxxxxxxxx>, Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>, Christophe Leroy <christophe.leroy@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Changbin Du <changbin.du@xxxxxxxxxx>, Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx>, Geert Uytterhoeven <geert+renesas@xxxxxxxxx>, Namhyung Kim <namhyung@xxxxxxxxxx>, Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx
In-reply-to: <7bbf9cae-6392-47a4-906c-7c27b1b1223d@intel.com>
References: <20240710160655.3402786-1-alexander.shishkin@linux.intel.com> <20240710160655.3402786-4-alexander.shishkin@linux.intel.com> <20240710171836.GGZo7CbFJeZwLCZUAt@fat_crate.local> <cqacx3crogegwyslm25kwcdcezgg2n44lhy3mg5qkka3vgn4xa@lhqsoseyduus> <7bbf9cae-6392-47a4-906c-7c27b1b1223d@intel.com>

On Wed, Jul 10, 2024 at 04:05:31PM -0700, Dave Hansen wrote:

> But, I'm 100% sure that we want to distinguish a LASS-necessitated
> stac()/clac() from a SMAP-necessitated one somehow.

Yeah, if only to make it easier to understand the code.

Follow-Ups:
- Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
  - From: Kirill A. Shutemov

References:
- [PATCH v4 00/16] Enable Linear Address Space Separation support
  - From: Alexander Shishkin
- [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
  - From: Alexander Shishkin
- Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
  - From: Borislav Petkov
- Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
  - From: Kirill A. Shutemov
- Re: [PATCH v4 03/16] x86/alternatives: Disable LASS when patching kernel alternatives
  - From: Dave Hansen

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