From: Borislav Petkov <bp@alien8.de>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Ard Biesheuvel <ardb@kernel.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
Josh Poimboeuf <jpoimboe@kernel.org>,
Xiongwei Song <xiongwei.song@windriver.com>,
Xin Li <xin3.li@intel.com>,
"Mike Rapoport (IBM)" <rppt@kernel.org>,
Brijesh Singh <brijesh.singh@amd.com>,
Michael Roth <michael.roth@amd.com>,
Tony Luck <tony.luck@intel.com>,
Alexey Kardashevskiy <aik@amd.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jonathan Corbet <corbet@lwn.net>,
Sohil Mehta <sohil.mehta@intel.com>,
Ingo Molnar <mingo@kernel.org>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
Kai Huang <kai.huang@intel.com>,
Sandipan Das <sandipan.das@amd.com>,
Breno Leitao <leitao@debian.org>,
Rick Edgecombe <rick.p.edgecombe@intel.com>,
Alexei Starovoitov <ast@kernel.org>, Hou Tao <houtao1@huawei.com>,
Juergen Gross <jgross@suse.com>,
Vegard Nossum <vegard.nossum@oracle.com>,
Kees Cook <kees@kernel.org>, Eric Biggers <ebiggers@google.com>,
Jason Gunthorpe <jgg@ziepe.ca>,
"Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Yuntao Wang <ytcoode@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Tejun Heo <tj@kernel.org>, Changbin Du <changbin.du@huawei.com>,
Huang Shijie <shijie@os.amperecomputing.com>,
Geert Uytterhoeven <geert+renesas@glider.be>,
Namhyung Kim <namhyung@kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-efi@vger.kernel.org, linux-mm@kvack.org,
Yian Chen <yian.chen@intel.com>
Subject: Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits
Date: Fri, 20 Jun 2025 20:29:43 +0200 [thread overview]
Message-ID: <20250620182943.GDaFWolxhwogB2tTxb@fat_crate.local> (raw)
In-Reply-To: <6y2iqv6c2idn7yebaec7tyhzl5zcsrwqq4lcsokumlqeophzaf@ljnmxorblgcj>
On Fri, Jun 20, 2025 at 08:33:36PM +0300, Kirill A. Shutemov wrote:
> What is current policy around it ?
Documentation/arch/x86/cpuinfo.rst
> I think it is useful to advertise security features in cpuinfo.
Because who's going to consume them?
Don't get me wrong - I am trying to see whether the whole use case for this is
well thought out. Because it becomes an ABI.
But if no one is going to use it, why bother?
Arguably, for this thing the argument would be - as it is put in that file
above:
"So, the current use of /proc/cpuinfo is to show features which the
kernel has *enabled* and *supports*."
as it has been enabled by machinery.
So that's ok. I'm just making sure we're on the same page and you're not
aiming at something completely different with this.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2025-06-20 18:30 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250620135325.3300848-1-kirill.shutemov@linux.intel.com>
[not found] ` <20250620135325.3300848-9-kirill.shutemov@linux.intel.com>
2025-06-20 14:47 ` [PATCHv6 08/16] x86/traps: Consolidate user fixups in exc_general_protection() Dave Hansen
[not found] ` <20250620135325.3300848-14-kirill.shutemov@linux.intel.com>
2025-06-20 15:20 ` [PATCHv6 13/16] x86/traps: Handle LASS thrown #SS Xin Li
2025-06-20 17:53 ` Kirill A. Shutemov
[not found] ` <20250620135325.3300848-4-kirill.shutemov@linux.intel.com>
2025-06-20 15:33 ` [PATCHv6 03/16] x86/alternatives: Disable LASS when patching kernel alternatives Dave Hansen
2025-06-20 17:18 ` Kirill A. Shutemov
[not found] ` <20250620135325.3300848-5-kirill.shutemov@linux.intel.com>
2025-06-20 15:35 ` [PATCHv6 04/16] x86/efi: Move runtime service initialization to arch/x86 Dave Hansen
2025-06-20 17:42 ` Kirill A. Shutemov
2025-06-20 15:38 ` [PATCHv6 00/16] x86: Enable Linear Address Space Separation support Dave Hansen
2025-06-20 22:04 ` Andrew Cooper
2025-06-20 22:29 ` H. Peter Anvin
2025-06-20 22:43 ` H. Peter Anvin
2025-06-20 22:46 ` Dave Hansen
[not found] ` <20250620135325.3300848-6-kirill.shutemov@linux.intel.com>
2025-06-20 15:44 ` [PATCHv6 05/16] x86/cpu: Defer CR pinning setup until after EFI initialization Dave Hansen
[not found] ` <20250620135325.3300848-7-kirill.shutemov@linux.intel.com>
2025-06-20 15:55 ` [PATCHv6 06/16] efi: Disable LASS around set_virtual_address_map() EFI call Dave Hansen
2025-06-20 17:50 ` Kirill A. Shutemov
[not found] ` <20250620135325.3300848-2-kirill.shutemov@linux.intel.com>
2025-06-20 15:25 ` [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits Dave Hansen
2025-06-20 15:36 ` Xin Li
2025-06-20 17:31 ` Kirill A. Shutemov
2025-06-20 23:46 ` Xin Li
2025-06-21 0:45 ` H. Peter Anvin
2025-06-21 0:50 ` H. Peter Anvin
2025-06-23 17:40 ` Xin Li
2025-06-24 2:04 ` H. Peter Anvin
2025-06-24 4:57 ` Xin Li
2025-06-24 5:11 ` Xin Li
2025-06-20 16:02 ` Randy Dunlap
2025-06-20 16:12 ` Xin Li
2025-06-20 16:16 ` Randy Dunlap
2025-06-20 16:35 ` Borislav Petkov
2025-06-20 17:33 ` Kirill A. Shutemov
2025-06-20 18:29 ` Borislav Petkov [this message]
2025-06-23 8:17 ` Kirill A. Shutemov
2025-06-23 10:21 ` Borislav Petkov
2025-06-23 13:42 ` Kirill A. Shutemov
2025-06-26 15:18 ` Borislav Petkov
2025-06-26 16:07 ` Borislav Petkov
2025-06-26 17:21 ` Dave Hansen
2025-06-27 10:25 ` Kirill A. Shutemov
2025-06-27 10:43 ` Borislav Petkov
2025-06-27 13:57 ` Dave Hansen
2025-06-20 18:14 ` Sohil Mehta
2025-06-20 18:24 ` Dave Hansen
2025-06-20 23:10 ` Sohil Mehta
2025-06-23 16:25 ` Luck, Tony
2025-06-23 16:42 ` Dave Hansen
2025-06-23 23:13 ` Luck, Tony
2025-06-23 23:36 ` H. Peter Anvin
2025-06-24 0:10 ` Luck, Tony
2025-06-24 2:03 ` H. Peter Anvin
2025-06-25 18:51 ` H. Peter Anvin
[not found] ` <20250620135325.3300848-8-kirill.shutemov@linux.intel.com>
2025-06-20 18:43 ` [PATCHv6 07/16] x86/vsyscall: Reorganize the #PF emulation code Dave Hansen
2025-06-20 23:08 ` Andrew Cooper
2025-06-20 23:18 ` Sohil Mehta
2025-06-20 23:29 ` Andrew Cooper
2025-06-20 23:21 ` Dave Hansen
2025-06-21 3:35 ` H. Peter Anvin
2025-06-23 12:41 ` Kirill A. Shutemov
2025-06-23 12:46 ` Andrew Cooper
2025-06-23 15:32 ` Dave Hansen
2025-06-23 15:45 ` Andrew Cooper
2025-06-24 11:37 ` Kirill A. Shutemov
2025-06-24 14:11 ` Dave Hansen
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