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Shutemov" To: Borislav Petkov Cc: Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Ard Biesheuvel , "Paul E. McKenney" , Josh Poimboeuf , Xiongwei Song , Xin Li , "Mike Rapoport (IBM)" , Brijesh Singh , Michael Roth , Tony Luck , Alexey Kardashevskiy , Alexander Shishkin , Jonathan Corbet , Sohil Mehta , Ingo Molnar , Pawan Gupta , Daniel Sneddon , Kai Huang , Sandipan Das , Breno Leitao , Rick Edgecombe , Alexei Starovoitov , Hou Tao , Juergen Gross , Vegard Nossum , Kees Cook , Eric Biggers , Jason Gunthorpe , "Masami Hiramatsu (Google)" , Andrew Morton , Luis Chamberlain , Yuntao Wang , Rasmus Villemoes , Christophe Leroy , Tejun Heo , Changbin Du , Huang Shijie , Geert Uytterhoeven , Namhyung Kim , Arnaldo Carvalho de Melo , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, linux-mm@kvack.org, Yian Chen Subject: Re: [PATCHv6 01/16] x86/cpu: Enumerate the LASS feature bits Message-ID: <6y2iqv6c2idn7yebaec7tyhzl5zcsrwqq4lcsokumlqeophzaf@ljnmxorblgcj> References: <20250620135325.3300848-1-kirill.shutemov@linux.intel.com> <20250620135325.3300848-2-kirill.shutemov@linux.intel.com> <20250620163504.GCaFWNuI-8QFqAM0yI@fat_crate.local> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250620163504.GCaFWNuI-8QFqAM0yI@fat_crate.local> X-Rspamd-Server: rspam11 X-Rspam-User: X-Rspamd-Queue-Id: 7C3451A0019 X-Stat-Signature: fjeb9hg7ee7mozewaocqtb1h6zbimez4 X-HE-Tag: 1750440829-890821 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jun 20, 2025 at 06:35:04PM +0200, Borislav Petkov wrote: > On Fri, Jun 20, 2025 at 04:53:09PM +0300, Kirill A. Shutemov wrote: > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > > index ee176236c2be..4473a6f7800b 100644 > > --- a/arch/x86/include/asm/cpufeatures.h > > +++ b/arch/x86/include/asm/cpufeatures.h > > @@ -313,6 +313,7 @@ > > #define X86_FEATURE_SM4 (12*32+ 2) /* SM4 instructions */ > > #define X86_FEATURE_AVX_VNNI (12*32+ 4) /* "avx_vnni" AVX VNNI instructions */ > > #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* "avx512_bf16" AVX512 BFLOAT16 instructions */ > > +#define X86_FEATURE_LASS (12*32+ 6) /* "lass" Linear Address Space Separation */ > > This needs to be in /proc/cpuinfo because...? What is current policy around it ? I think it is useful to advertise security features in cpuinfo. LASS fits next to SMAP/SMEP/UMIP. -- Kiryl Shutsemau / Kirill A. Shutemov