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Fri, 10 Oct 2025 19:03:27 +0000 Message-ID: <2dfba3fa-64f8-494f-a4da-46934f21d10d@intel.com> Date: Fri, 10 Oct 2025 12:03:24 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 04/15] x86/cpu: Set LASS CR4 bit as pinning sensitive Content-Language: en-US To: "Edgecombe, Rick P" , "tglx@linutronix.de" , "mingo@redhat.com" , "dave.hansen@linux.intel.com" , "bp@alien8.de" , "x86@kernel.org" CC: "corbet@lwn.net" , "ardb@kernel.org" , "andrew.cooper3@citrix.com" , "alexander.shishkin@linux.intel.com" , "luto@kernel.org" , "david.laight.linux@gmail.com" , "jpoimboe@kernel.org" , "Luck, Tony" , "linux-efi@vger.kernel.org" , "kas@kernel.org" , "seanjc@google.com" , "dwmw@amazon.co.uk" , "rdunlap@infradead.org" , "vegard.nossum@oracle.com" , "xin@zytor.com" , "linux-kernel@vger.kernel.org" , "linux-doc@vger.kernel.org" , "kees@kernel.org" , "hpa@zytor.com" , "peterz@infradead.org" , "geert@linux-m68k.org" References: <20251007065119.148605-1-sohil.mehta@intel.com> <20251007065119.148605-5-sohil.mehta@intel.com> <7635c45d-97b3-4773-95db-e61ad872ce22@intel.com> <66212761b9ef76b209e83e08c9258b76f51dbebc.camel@intel.com> From: Sohil Mehta In-Reply-To: <66212761b9ef76b209e83e08c9258b76f51dbebc.camel@intel.com> Content-Type: text/plain; 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So wondered, hmm, is it > worth it to do the extra patches? > Yeah, I reconsidered its usefulness as well. Though, adding it to CR4 pinned mask is a net positive, even with the extra patch. As part of the pinning enforcement, we get the warning if LASS is turned off by accident. The bit gets reprogrammed automatically which, even if not useful, wouldn't harm in any way. Also, the changes to defer CR pinning enforcement seem to be useful independent of LASS. Plus, the patch turned out to be simpler than I had imagined. > Yea, I agree it would be good to get a warning. The write may be triggered > accidentally by a kernel bug. I agree with the patch, but just commenting my > reasoning for the sake of discussion. Maybe we can tighten the reasoning in the > log. Will do.