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[92.21.58.28]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4538a3b2fd7sm129422525e9.17.2025.06.30.01.30.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Jun 2025 01:30:39 -0700 (PDT) Date: Mon, 30 Jun 2025 09:30:27 +0100 From: David Laight To: "Kirill A. Shutemov" Cc: Xin Li , Andy Lutomirski , Thomas Gleixner , Ingo Molnar , Borislav Petkov , 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 Subject: Re: [PATCHv7 13/16] x86/traps: Handle LASS thrown #SS Message-ID: <20250630093027.38cd1ebc@pumpkin> In-Reply-To: References: <20250625125112.3943745-1-kirill.shutemov@linux.intel.com> <20250625125112.3943745-15-kirill.shutemov@linux.intel.com> X-Mailer: Claws Mail 4.1.1 (GTK 3.24.38; arm-unknown-linux-gnueabihf) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 5D8BBC0018 X-Stat-Signature: feju79kxr1y76fwi8kamch13kohu7jx9 X-Rspam-User: X-HE-Tag: 1751272242-932890 X-HE-Meta: U2FsdGVkX1+NLfHxWWlVGVnKskCiJOtHRDUhCIDoI93/FZS0hLvf9JNm/Jr1RIsFA31xn3ZDVzzLeYNinGhr01vtNlwRPcc+TP/fFqQ6pJ8M35UlBThbKPd5cSsqZaj7qZjzjC1yqLUTGshbtVfvxp+Z1bkIuWKaCcgkwBst0eWTAS8XDGN0WPp2msYrp6RLRiLbsSssIkvttL6UslVRs/TzUkPrYIhqpWmKtLQgOzYgiGXeWDApiNdqhg9/R8HQU024LQAFWCljXSCRbzEXehzk2QmzvKR1F9lM0QDZ35KVeYaT1Lp9oVZGF5AvL89GcYMypkiQvCCiiSl1m2kp63lFXfnAXKkzK4lGXEMXXH8UTN+Iu6QE+gkIO9Rl7+100y9mh/27GbV75Vcd93/GQrfL/2Uu+Ftq2CpwqlrvPZ12nSYLq20tLWX/4KVMtAb2RDDimMCSyjNWT4VuNGheo8RyHqKXKR9R5MoKKlGDGxnm6tFgmQnqIU2s3iBLmzVLH1GRneTZY6m/2GIQv9WM3SJFAMpHUFAcCf9wlLbZdLkzwHw3b/u9Hb1V+GgrX4jQ0CLq/5hs7a1HAGrnhk3QMF+xNaE36wTXBHSkU6xYzobbNwccTNLoLnIGciz5S/im8tycsS6nwMCHIL9xY/FOjviD580Ke5OSnU/f4nNhBvoTQyvrYGhcH7zVMLhC9o4lSPSrx0nnTR/9A/bgdUrmv4ex0wkxzPckSvsuviohQYJ57AJ6tXU69oYHHIvIQgcdfo8GvYpKz3lt+vFcDgE6YPXpw2x45D0978KlFddNgHDanzBZuuv620j12SzvH2H7iqyyZy7It5qGELj6Zp0miQjJsm+/MKEiD4kUkJrKMC9Hcc+UajUu+bRD4dk7TWErgwj5xWWsK9aehDPkNSeZcVuWRIdktDsgfym/kwpGqHmSfidHQ6+hN6paY/Rfoic19msyM9qbbS9ZxmomsYj 1iX7RqUw 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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, 27 Jun 2025 13:31:44 +0300 "Kirill A. Shutemov" wrote: > On Thu, Jun 26, 2025 at 10:57:47AM -0700, Xin Li wrote: > > On 6/25/2025 5:51 AM, Kirill A. Shutemov wrote: > > > LASS throws a #GP for any violations except for stack register accesses, > > > in which case it throws a #SS instead. Handle this similarly to how other > > > LASS violations are handled. > > > > > > In case of FRED, before handling #SS as LASS violation, kernel has to > > > check if there's a fixup for the exception. It can address #SS due to > > > invalid user context on ERETU[1]. See 5105e7687ad3 ("x86/fred: Fixup > > > > Forgot to put the link to [1]? Maybe just remove "[1]"? > > I will add the link. It is important context. Will the link still be valid in 5 years time when someone is looking back at the changes? David