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Tue, 1 Jul 2025 23:03:48 +0000 Message-ID: <121a34a7-518c-4f2c-8e89-c6cacd02a9df@intel.com> Date: Tue, 1 Jul 2025 16:03:45 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHv8 15/17] x86/cpu: Make LAM depend on LASS Content-Language: en-US To: "Kirill A. Shutemov" , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , , "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 CC: Jonathan Corbet , 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 , , , , References: <20250701095849.2360685-1-kirill.shutemov@linux.intel.com> <20250701095849.2360685-16-kirill.shutemov@linux.intel.com> From: Sohil Mehta In-Reply-To: <20250701095849.2360685-16-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR04CA0039.namprd04.prod.outlook.com (2603:10b6:303:6a::14) To BYAPR11MB3320.namprd11.prod.outlook.com (2603:10b6:a03:18::25) Precedence: bulk X-Mailing-List: linux-efi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3320:EE_|IA0PR11MB8303:EE_ X-MS-Office365-Filtering-Correlation-Id: 16398547-45c9-4257-2339-08ddb8f389b8 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|366016|1800799024|7053199007|921020; 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Shutemov wrote: > From: Alexander Shishkin > > To prevent exploits for Spectre based on LAM as demonstrated by the > whitepaper [1], make LAM depend on LASS, which avoids this type of > vulnerability. > > [1] https://download.vusec.net/papers/slam_sp24.pdf > > Signed-off-by: Alexander Shishkin > Signed-off-by: Kirill A. Shutemov > --- > arch/x86/kernel/cpu/cpuid-deps.c | 1 + > 1 file changed, 1 insertion(+) > In terms of patch ordering, wouldn't it make more sense to introduce LAM related changes after LASS has been fully enabled? This patch should probably be after Patch #16 which enables LASS. Logically, the LAM re-enabling stuff can be a separate series, but since it's only a few changed lines having it at the end seems okay. Patch 1-15 => Enable LASS Patch 16-17 => Re-enable LAM Other than that, Reviewed-by: Sohil Mehta > diff --git a/arch/x86/kernel/cpu/cpuid-deps.c b/arch/x86/kernel/cpu/cpuid-deps.c > index 98d0cdd82574..11bb9ed40140 100644 > --- a/arch/x86/kernel/cpu/cpuid-deps.c > +++ b/arch/x86/kernel/cpu/cpuid-deps.c > @@ -90,6 +90,7 @@ static const struct cpuid_dep cpuid_deps[] = { > { X86_FEATURE_FRED, X86_FEATURE_LKGS }, > { X86_FEATURE_SPEC_CTRL_SSBD, X86_FEATURE_SPEC_CTRL }, > { X86_FEATURE_LASS, X86_FEATURE_SMAP }, > + { X86_FEATURE_LAM, X86_FEATURE_LASS }, > {} > }; >