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Wed, 9 Jul 2025 01:27:23 +0000 Message-ID: Date: Tue, 8 Jul 2025 18:27:21 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCHv9 05/16] efi: Disable LASS around set_virtual_address_map() EFI call 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: <20250707080317.3791624-1-kirill.shutemov@linux.intel.com> <20250707080317.3791624-6-kirill.shutemov@linux.intel.com> From: Sohil Mehta In-Reply-To: <20250707080317.3791624-6-kirill.shutemov@linux.intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR05CA0049.namprd05.prod.outlook.com (2603:10b6:a03:74::26) To BYAPR11MB3320.namprd11.prod.outlook.com (2603:10b6:a03:18::25) Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BYAPR11MB3320:EE_|CY8PR11MB7873:EE_ X-MS-Office365-Filtering-Correlation-Id: 20e94711-d6ab-4489-09ba-08ddbe87c184 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|1800799024|376014|366016|921020|7053199007; 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Shutemov wrote: > From: Alexander Shishkin > > Of all the EFI runtime services, set_virtual_address_map() is the only > one that is called at its lower mapping, which LASS prohibits regardless > of EFLAGS.AC setting. The only way to allow this to happen is to disable > LASS in the CR4 register. > > Disable LASS around this low address EFI call. > > Signed-off-by: Alexander Shishkin > Signed-off-by: Kirill A. Shutemov > --- > arch/x86/platform/efi/efi.c | 15 +++++++++++++++ > 1 file changed, 15 insertions(+) > Reviewed-by: Sohil Mehta A minor nit below. > diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c > index 463b784499a8..5b23c0daedef 100644 > --- a/arch/x86/platform/efi/efi.c > +++ b/arch/x86/platform/efi/efi.c > @@ -787,6 +787,7 @@ static void __init __efi_enter_virtual_mode(void) > int count = 0, pg_shift = 0; > void *new_memmap = NULL; > efi_status_t status; > + unsigned long lass; > unsigned long pa; > The two unsigned longs can be on the same line. > if (efi_alloc_page_tables()) {