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msatwood-mobl.amr.corp.intel.com (HELO [10.125.109.13]) ([10.125.109.13]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Mar 2025 10:41:27 -0800 Content-Type: multipart/mixed; boundary="------------uN8jXvp4vvy0mjcYW4E3DSkl" Message-ID: <30c721e0-338d-4172-989c-5226d584bcbc@intel.com> Date: Mon, 3 Mar 2025 10:41:44 -0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v14 03/13] x86/mm: add INVLPGB support code To: Borislav Petkov , Rik van Riel Cc: x86@kernel.org, linux-kernel@vger.kernel.org, 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@amd.com, mingo@kernel.org References: <20250226030129.530345-1-riel@surriel.com> <20250226030129.530345-4-riel@surriel.com> <20250228194734.GGZ8IS1iFVpPzmEyYl@fat_crate.local> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs 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@@ -157,11 +140,14 @@ index 77f52bc1578a..91c9a4da3ace 100644 > +/* Flush all mappings for all PCIDs except globals. */ > +static inline void invlpgb_flush_all_nonglobals(void) > +{ > ++ /* > ++ * @addr=0 means both rax[1] (valid PCID) and rax[2] (valid ASID) are clear > ++ * so flush *any* PCID and ASID. > ++ */ > + __invlpgb(0, 0, 0, 1, 0, 0); > + __tlbsync(); > +} I had a bit of an allergic reaction to all of the magic numbers. Could we do something like the attached where we give a _few_ of the magic numbers some symbolic names? For instance, instead of passing around a bool for pmd_stride, this uses an enum. 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