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X-CSE-ConnectionGUID: C54Olke3R4u+8j8p29Uw5g== X-CSE-MsgGUID: SdZmNP2CStCCHNfcUtrH7w== X-IronPort-AV: E=McAfee;i="6700,10204,11345"; a="40455967" X-IronPort-AV: E=Sophos;i="6.13,286,1732608000"; d="scan'208";a="40455967" Received: from fmviesa002.fm.intel.com ([10.60.135.142]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2025 10:16:55 -0800 X-CSE-ConnectionGUID: P+g8tzUNSgi9u2QQ8LTF9Q== X-CSE-MsgGUID: iz41BeoARLiStHylkiab9g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="136753603" Received: from tjmaciei-mobl5.ger.corp.intel.com (HELO [10.125.109.21]) ([10.125.109.21]) by fmviesa002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Feb 2025 10:16:53 -0800 Message-ID: <33e34670-3c24-46d4-9c26-c05a03a8a1b0@intel.com> Date: Fri, 14 Feb 2025 10:16:55 -0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 04/12] x86/mm: get INVLPGB count max from CPUID To: Rik van Riel , x86@kernel.org Cc: linux-kernel@vger.kernel.org, bp@alien8.de, peterz@infradead.org, dave.hansen@linux.intel.com, zhengqi.arch@bytedance.com, nadav.amit@gmail.com, thomas.lendacky@amd.com, kernel-team@meta.com, linux-mm@kvack.org, akpm@linux-foundation.org, jackmanb@google.com, jannh@google.com, mhklinux@outlook.com, andrew.cooper3@citrix.com, Manali Shukla References: <20250213161423.449435-1-riel@surriel.com> <20250213161423.449435-5-riel@surriel.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 2/13/25 08:13, Rik van Riel wrote: > + /* Max number of pages INVLPGB can invalidate in one shot */ > + if (boot_cpu_has(X86_FEATURE_INVLPGB)) { > + cpuid(0x80000008, &eax, &ebx, &ecx, &edx); > + invlpgb_count_max = (edx & 0xffff) + 1; > + } > } My only nit with this is that this adds a seventh place that the kernel reads leaf 0x80000008. The users seem really random, though. Some cross-vendor stuff, some very AMD-specific stuff. So, I'll leave that at a nit since I don't have a good suggestion for solving it: Acked-by: Dave Hansen