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Tue, 7 Oct 2025 22:33:21 +0000 Message-ID: Date: Tue, 7 Oct 2025 15:33:17 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v10 07/15] x86/kexec: Disable LASS during relocate kernel Content-Language: en-US To: "Edgecombe, Rick P" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "x86@kernel.org" , "dave.hansen@linux.intel.com" CC: "corbet@lwn.net" , "ardb@kernel.org" , "david.laight.linux@gmail.com" , "luto@kernel.org" , "jpoimboe@kernel.org" , "andrew.cooper3@citrix.com" , "Luck, Tony" , "alexander.shishkin@linux.intel.com" , "kas@kernel.org" , "seanjc@google.com" , "rdunlap@infradead.org" , "dwmw@amazon.co.uk" , "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" , "linux-efi@vger.kernel.org" , "geert@linux-m68k.org" References: <20251007065119.148605-1-sohil.mehta@intel.com> <20251007065119.148605-8-sohil.mehta@intel.com> <91d9ea3cc16bf76e682b43f6b0e3f9d53dce7724.camel@intel.com> From: Sohil Mehta In-Reply-To: <91d9ea3cc16bf76e682b43f6b0e3f9d53dce7724.camel@intel.com> Content-Type: text/plain; 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To avoid issues, disable LASS after the >> original CR4 value has been saved but before jumping to the identity >> mapped page. > > It could help to expand on this a bit. Something like... We need to disable LASS > before we jump to the identity map because otherwise it will immediately die > trying to execute a low address. But if the kexec flavor gets to virtual_mapped, > we want LASS restored, so we need to disable LASS after CR4 is saved. We also > can't disable it where CET get's disabled because that is too late. So disable > it along with PGE. > Sure, will add the detailed reasoning.